54C-1

GROUP 54C

CONTROLLER
AREA NETWORK
(CAN)
CONTENTS

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GENERAL INFORMATION . . . . . . . . 54C-2 EXPLANATION ABOUT THE MUT-III CAN BUS
DIAGNOSTICS . . . . . . . . . . . . . . . . . . 54C-7
SPECIAL TOOL . . . . . . . . . . . . . . . . . 54C-3
TROUBLESHOOTING . . . . . . . . . . . . 54C-14
TEST EQUIPMENT . . . . . . . . . . . . . . 54C-4 CAN BUS DIAGNOSTICS TABLE . . . . . . . 54C-14
CAN BUS DIAGNOSIS . . . . . . . . . . . . . . . . 54C-18
SERVICE PRECAUTIONS. . . . . . . . . 54C-5
CAN COMMUNICATION SIGNAL
PRECAUTIONS ON HOW TO REPAIR THE TABLE. . . . . . . . . . . . . . . . . . . . . . . . . 54C-85
CAN BUS LINES . . . . . . . . . . . . . . . . 54C-6
CAN COMMUNICATION-RELATED
DIAGNOSIS CODE (U CODE) TABLE 54C-86
54C-2 CONTROLLER AREA NETWORK (CAN)
GENERAL INFORMATION

GENERAL INFORMATION
M1548310000115
CAN, an abbreviation for Controller Area Network, is CAN offers the following advantages.
an ISO-certified international standard for a serial • Transmission rates are much faster than those in
multiplex communication protocol*. A communication conventional communication (up to 1 Mbps),
circuit employing the CAN protocol connects each allowing much more data to be sent.
ECU, and sensor data can be shared among, which • It is exceptionally immune to noise, and the data
enables more reduction in wiring. obtained from each error detection device is more
reliable.
NOTE: *: The regulations have been decided in
• Each ECU connected via the CAN communicates
detail, from software matters such as the necessary
independently, therefore if the ECU enters dam-
transmission rate for communication, the system,
aged mode, communications can be continued in
data format, and communication timing control
some cases.
method to hardware matters such as the harness
type and length and the resistance values.

STRUCTURE

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Terminal resistor Terminal resistor
Main bus lines
CAN_H

Engine-ECU ETACS-ECU

CAN_L

Diagnosis
CAN connector
A/T-ECU ABS-ECU
adapter

MUT-III

: Shows main bus line.

: Shows sub bus line.

AC204755AC

• The CAN bus line consists of two lines, CAN_L • The terminal resistors are installed in the
and CAN_H (CAN Low and CAN High, respec- engine-ECU and ETACS-ECU to stabilize com-
tively), as well as two terminal resistors (A munication signals (The terminal resistance is set
twisted-pair cable, highly resistant to noise, is at approximately 120 Ω).
used for the communications line). • ECUs are connected in the CAN bus line as fol-
• The CAN bus line connecting the two terminal lows.
resistors is the main bus line, and the CAN bus • Engine-ECU
line connecting each ECU is the sub-bus line. • A/T-ECU <A/T>
• ABS-ECU <Vehicles with ABS>
• CAN adapter <Vehicles with RV meter>
• ETACS-ECU
 CONTROLLER AREA NETWORK (CAN)
SPECIAL TOOL
54C-3
SPECIAL TOOL
M1548304200239

Tool Number Name Use

MB991955 MUT-III CAN bus diagnosis
a sub-assembly
a. MB991824 CAUTION
b. MB991827 a. Vehicle For vehicles with CAN
c. MB991910 Communicati communication, use MUT-III main
d. MB991911 on Interface harness A to send simulated
MB991824
(V. C. I.) vehicle speed. If you connect
e. MB991825
b b. MUT-III USB MUT-III main harness B instead,
f. MB991826
cable the CAN communication does
c. MUT-III main not function correctly.
harness A
MB991827 (Vehicles with
c CAN
communicatio
n system)
d. MUT-III main

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MB991910 harness B
(Vehicles
d
without CAN
DO NOT USE communicatio
n system)
MB991911
e. MUT-III
measure
e adapter
f. MUT-III
trigger
harness
MB991825

MB991826

MB991955
54C-4 CONTROLLER AREA NETWORK (CAN)
TEST EQUIPMENT

Tool Number Name Use

MB991223 Harness set Continuity check and voltage
a
a. MB991219 a. Check measurement at harness wire or
b. MB991220 harness connector
c. MB991221 b. LED harness a. For checking connector pin
d. MB991222 c. LED harness contact pressure
b
adapter b. For checking power supply
d. Probe circuit
c. For checking power supply
circuit
c d. For connecting a locally sourced
tester

d
DO NOT USE
MB991223BA

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MB992006 Extra fine probe Continuity check and voltage
measurement at harness wire or
connector

MB992006

MB991952 ABS check Checking continuity and measuring

harness voltage at ABS-ECU harness-side
connector

MB991952

TEST EQUIPMENT
M1548304300195

Test equipment Name Use

Digital multimeter Checking CAN bus circuit (for resistance and voltage
measurements)

AC000019
 CONTROLLER AREA NETWORK (CAN)
SERVICE PRECAUTIONS
54C-5
SERVICE PRECAUTIONS
M1548302100184

Warnings in diagnosis section Details regarding warning

CAUTION −
When servicing an CAN bus line, earth yourself
by touching a metal object such as an unpainted
water pipe. If you fail to do, a component
connected to the CAN bus line may be broken.
CAUTION When measuring resistance value or voltage in
A digital multimeter should be used. CAN bus lines, use a digital multimeter. If not
using a digital multimeter, the equipments, which
are connected through the CAN communication
lines, may be damaged.
CAUTION Disconnect the negative battery terminal when
When measuring the resistance, disconnect the measuring the resistance value in the CAN bus
negative battery terminal. line. If you fail to do so, the equipments, which
are connected through the CAN communication

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lines, may be damaged.
CAUTION Always use the test harness when measuring the
The test wiring harness should be used. voltage or resistance value at the female
connector. If you fail to do so, connectors may be
damaged.
CAUTION
Connector
The strand end of the twist wire should be within Twisted wire 10 cm
10 cm from the connector.

AC203824AB

If you repair the wire due to a defective

connector or its terminal or harness wire, you
should cut the wire so that the strand end of the
twist wire should be within 10 cm from the
connector as shown. If it exceeds 10 cm, twist
the wiring harness just like the original twisted
wire. If the strand end exceeds 10 cm, a
communication error may be caused.
CAUTION When you repair a CAN bus line, observe the
Strictly observe the specified wiring harness precautions on how to repair the CAN bus line
repair procedure. strictly. Refer to P.54C-6. If a new wire is added
or a splice point is modified for the CAN_L or
CAN_H line, an error in the CAN communication
may be caused.
54C-6 CONTROLLER AREA NETWORK (CAN)
PRECAUTIONS ON HOW TO REPAIR THE CAN BUS LINES

PRECAUTIONS ON HOW TO REPAIR THE CAN BUS LINES

M1548301900198

PRECAUTIONS ON HOW TO REPAIR THE No good

CAN BUS LINES Terminator resistor

No good

Added wire

Open
circuit
point
ECU ECU
Good
Terminator resistor

AC204696
4AB

• If the CAN bus line(s) are repaired, renew all the

twisted wires between the end connectors. If the Open
wiring harness is partially repaired, or only circuit
CAN_L or CAN_H line is repaired, noise suppres- point

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ECU ECU
sion is deteriorated, causing a communication
error.

Connector AC202856 AB
Twisted wire 10 cm
• If a sub-bus line is repaired, splice a new wire
directly into the main bus line. If a new wire is
spliced into the sub-bus line, which is connected
to another device, the CAN communication will
be disabled.

PRECAUTIONS ON HOW TO REPAIR THE

AC203824AB
TERMINATOR RESISTOR
• If the connector or wire on the main bus line or If one-side terminator resistor is broken, the CAN
the sub-bus wire is replaced, the frayed end of communication will continue although noise suppres-
the twisted wire should be within 10 cm from the sion is deteriorated. No diagnosis codes may be set
connector. If it exceeds 10 cm, twist the wiring even if the terminator resistor was broken. If a dam-
harness just like the original twisted wire. If the age is found, replace the ECU which incorporates
frayed end exceeds 10 cm, noise suppression is the defective terminator resistor.
deteriorated, causing a communication error.
 CONTROLLER AREA NETWORK (CAN)
EXPLANATION ABOUT THE MUT-III CAN BUS DIAGNOSTICS
54C-7
EXPLANATION ABOUT THE MUT-III CAN BUS
DIAGNOSTICS
M1548300100199
The MUT-III CAN bus diagnostics carries out the CAN BUS LINE DIAGNOSTIC FLOW
three checks below automatically, and then displays
current condition of the CAN bus lines according to
the check results.

From other diagnosis

1. MUT-III CAN bus

diagnostics

NG Short in CAN bus line to power

(1) Measuring voltage in CAN bus line
supply or ground
OK

(2) Measuring resistance in CAN bus line

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(3) Check ECU which MUT-III is NG for (2) or (3)
communicating with

OK for (2) and (3) OK for (2) and (3)

P code, B code, U code (past trouble)
C code or
U code (current trouble)

· Open circuit in can bus line

Go to ordinary diagnosis 2. Pinpoint possible trouble spot
· Broken terminator resistor
according to diagnosis code · Power supply to ecu poorly grounded

AC204700AF

1. MUT-III CAN bus diagnostics (1) Measuring voltage in CAN bus line
The MUT-III diagnoses CAN bus lines in Diagnoses the power supply (such as wires of
accordance with the following strategy. higher voltage than CAN communication line)
and earthing (such as wires of lower voltage
NOTE: When the MUT-III carries out the volt-
than CAN communication line) of CAN bus
age and resistance measurements, it will
lines for short circuit by measuring the
cease the communication between each of the
voltages between the CAN_L line or H line and
ECU. If the MUT-III cannot cease the commu-
body earth.
nication, it will carry out the voltage measure-
ment.
54C-8 CONTROLLER AREA NETWORK (CAN)
EXPLANATION ABOUT THE MUT-III CAN BUS DIAGNOSTICS

Terminal to be Normal value Measure Trouble when the Note

diagnosed ment measurement value
value does not meet the
normal value
Measuring the voltage 1.0 V or more and 4.0 Less than Short to earth of the
If the CAN_L or H line
between the CAN_L line V or less 1.0 V CAN_L line is shorted to earth or
and body earth More than Short to power power supply, a
4.0 V supply of the CAN_L diagnosis code may
line not be set.
Measuring the voltage 1.0 V or more and 4.0 Less than Short to earth of the
between the CAN_H line V or less 1.0 V CAN_H line
and body earth More than Short to power
4.0 V supply of the CAN_H
line
(2) Measuring resistance in CAN bus line Checks the terminator resistors (incorporated
in the combination meter or the engine-ECU),
which are connected to each end of a CAN

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bus line, for breakage and a CAN bus main
line for open circuit by measuring the
resistance value between a CAN_L line and H
line.
Normal Measure Trouble when the Note
value ment measurement value
value does not meet the
normal value
60 ± 10 Ω 120 ± 20 Ω Trouble in a CAN main line If only one terminator resistor is broken at either side,
or terminator resistor the CAN communication will continue although noise
suppression is deteriorated.
If a CAN main bus line is open circuit, the CAN
communication is suspended at that open circuit point.
No Trouble in CAN main bus −
continuity line or between the
diagnosis connector and
main bus line
2 Ω or less CAN bus line (between If a CAN bus line is shorted, all ECUs cease
CAN_L and H lines) is communicating each other (This fail-safe function is
shorted called "Bus off").
Other than Poorly engaged connector −
above
(3) Checking the communication condition of The MUT-III narrows down troubles in circuit
ECUs by itself. Its strategy is as follows.
 CONTROLLER AREA NETWORK (CAN)
EXPLANATION ABOUT THE MUT-III CAN BUS DIAGNOSTICS
54C-9

Reference circuit
Diagnosis
connector

(b)

(a) (c) (d) (e)

ECU A ECU D

(f) (g)

ECU B ECU C

AC502594AB

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54C-10 CONTROLLER AREA NETWORK (CAN)
EXPLANATION ABOUT THE MUT-III CAN BUS DIAGNOSTICS

ECU which Possible Logic for narrowing down trouble spot

cannot trouble spot
communicate
with the
MUT-III
ECU A CAN bus line ECU A communicates with the
(a) and power MUT-III via CAN bus lines (a) and Diagnosis
supply system (b). The MUT-III judges that CAN connector

to ECU A bus line (b) is normal, because it (b)

(a) (c) (d) (e)
can communicate with other
ECU A ECU D
ECUs. Possible trouble may be
present in CAN bus line (a) or the (f) (g)
power supply system to ECU A.
ECU B ECU C

AC204742 AZ

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 CONTROLLER AREA NETWORK (CAN)
EXPLANATION ABOUT THE MUT-III CAN BUS DIAGNOSTICS
54C-11
ECU which Possible Logic for narrowing down trouble spot
cannot trouble spot
communicate
with the
MUT-III
ECU C CAN bus line ECU C communicates with the
(g) and power MUT-III via CAN bus lines (b), (c), Diagnosis
supply system (d) and (g). The MUT-III judges connector

to ECU C that CAN bus lines (b), (c) and (d) (b)
(a) (c) (d) (e)
are normal, because it can
ECU A ECU D
communicate with ECUs B and D.
Possible trouble may be present (f) (g)
in CAN bus line (g) or the power
supply system to ECU C. ECU B ECU C

AC204742 BA

ECU C and Trouble in ECUs C ad D communicate with

ECU D CAN bus line the MUT-III via CAN bus lines (b), Diagnosis
(d) (c), (d), (e) and (g). The MUT-III connector

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judges that CAN bus lines (b) and (b)
(c) (d) (e)
(c) are normal, because it can (a)
ECU A ECU D
communicate with ECU B.
Possible trouble may be present (f) (g)
in CAN bus line (d), (e) or (g) or
the power supply system to ECU ECU B ECU C

D. CAN bus line (d) is shared by AC204742BB

ECUs C and D when they
communicate with the MUT-III, so
CAN bus line (d) is suspected as
ultimate cause. CAN bus line (g)
or (e) and power supply systems
to ECU C or D are also suspected
as second cause.
ECU B and CAN bus line ECUs C ad D communicate with
ECU D (e) or (f) or the MUT-III via CAN bus lines (b), Diagnosis
power supply (c), (d), (e) and (g). The MUT-III connector

system to ECU judges that CAN bus lines (b), (c) (b)
(c) (d) (e)
B or D and (d) are normal, because it (a)
ECU A ECU D
can communicate with ECU C.
Possible trouble may be present (f) (g)
in CAN bus line (f) or (e) or the
power supply system to ECU B or ECU B ECU C

D. AC204742 BC

2. If diagnosis code related to CAN communication NOTE: Time-out diagnosis code codes are stored
is set as past trouble, isolate opens as described in each ECU memory individually. Therefore, it is
below. possible that these diagnosis code codes have
NOTE: If you pinpoint trouble spot according to not been set simultaneously. If the trouble spot
diagnosis code, you should use time-out diagno- cannot be found when you diagnose by judging
sis code. diagnosis code related to failure infor- from multiple diagnosis code codes, check the
mation is set when the data to be set contains an communication lines between each ECU.
error, so CAN bus line itself is probably normal.
54C-12 CONTROLLER AREA NETWORK (CAN)
EXPLANATION ABOUT THE MUT-III CAN BUS DIAGNOSTICS

Diagnosis Possible Logic for narrowing down trouble spot

code to be set trouble spot
Time-out Trouble in When time-out diagnosis code
diagnosis code CAN bus line associated with ECU D is stored Diagnosis
associated with (e) and power in ECU A, B and C, or time-out connector

ECU D is stored supply system diagnosis code associated with (b)

(a) (c) (d) (e)
in ECU A, ECU to ECU D ECUs A, B and C is stored in
ECU A ECU D
B and ECU C. ECU D, or "bus off" diagnosis
Time-out code is stored in ECU D, CAN (f) (g)

diagnosis code bus line (e) is suspected. When

associated with diagnosis code is not stored in ECU B ECU C

ECUs A, B and ECU D, the power supply to ECU AC204742 BD

C is stored in D is suspected.
ECU.
"Bus off"
diagnosis code
is stored in ECU
D.

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 CONTROLLER AREA NETWORK (CAN)
EXPLANATION ABOUT THE MUT-III CAN BUS DIAGNOSTICS
54C-13
Diagnosis Possible Logic for narrowing down trouble spot
code to be set trouble spot
Time-out Trouble in When time-out diagnosis code
diagnosis code CAN bus line associated with ECU A is stored Diagnosis
associated with (a) and power in ECUs B, C and D, or time-out connector

ECU A is stored supply system diagnosis code associated with (b)

(a) (c) (d) (e)
in ECUs B, C to ECU A. ECUs B, C and D is stored in
ECU A ECU D
and D. ECU A, or "bus off" diagnosis
Time-out code is stored in ECU A, CAN (f) (g)

diagnosis code bus line (a) or (c) is suspected.

associated with When diagnosis code is not ECU B ECU C

ECUs B, C and stored in ECU A, the power AC204742 BE

D is stored in supply to ECU A is suspected.
ECU D. Diagnosis
"Bus off" connector

diagnosis code (b)

(a) (c) (d) (e)
is stored in ECU ECU A ECU D
A.

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(f) (g)

ECU B ECU C

AC204742 BF

Time-out Trouble in If time-out diagnosis code codes

diagnosis code CAN bus line associated with ECUs C and D Diagnosis
codes (d) are stored in ECUs A and B, or connector

associated with time-out codes associated with (b)

(a) (c) (d) (e)
ECUs C and D ECUs A and B are stored in
ECU A ECU D
are stored in ECUs C and D, CAN bus line (d)
ECU A and is suspected. CAN bus line (g) or (f) (g)
ECU B. (e) and power supply systems to
Time-out ECU C or D are also suspected ECU B ECU C

diagnosis code as second cause. AC204742BG

codes
associated with
ECUs A and B
are stored in
ECU C and
ECU D.
54C-14 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING

TROUBLESHOOTING
CAN BUS DIAGNOSTICS TABLE
M1548300200293
This diagnosis applies only to the CAN bus lines. If a
different system is defective, proceed to the applica-
ble diagnosis section for each system. Observe the
diagnosis procedure below only when the CAN bus
line is defective.
CAUTION
During diagnosis, a diagnosis code associated with another system may be set when the ignition
switch is turned on with connector(s) disconnected. After completing the repair, confirm all systems
for diagnosis code(s). If diagnosis code(s) are set, erase them all.

M.U.T.-III screen Diagnosis detail Reference

(The ECUs that are not adopted are not Comment page
displayed.)
Short circuit to battery in Diagnosis Item 1 P.54C-18

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M.U.T. : Red section on screen red displayed area is Diagnose shorts in
estimated. the power supply to
CAN bus line
J/C (1)

ETACS DISPLAY ABS J/C (2)

AT ENGINE

AC500140 AB

Earthing in red displayed Diagnosis Item 2 P.54C-30

M.U.T. : Red section on screen area is estimated. Diagnose shorts in
the ground to CAN
bus line
J/C (1)

ETACS DISPLAY ABS J/C (2)

AT ENGINE

AC500140 AB
 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING
54C-15
M.U.T.-III screen Diagnosis detail Reference
(The ECUs that are not adopted are not Comment page
displayed.)
Short circuit between Diagnosis Item 3 P.54C-45
M.U.T. : Red section on screen CAN_H and CAN_L in Diagnose shorts
red displayed area is between CAN_H and
estimated. L lines
J/C (1)

ETACS DISPLAY ABS J/C (2)

AT ENGINE

AC500140 AB

Disconnection in red
M.U.T. : Red section on screen displayed area is
estimated.

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J/C (1)

ETACS DISPLAY ABS J/C (2)

AT ENGINE

AC500140 AB

Disconnection in red Diagnosis Item 4 P.54C-55

M.U.T.
: Red section on screen displayed area is Diagnose the
estimated. terminator resistors
J/C (1)

ETACS DISPLAY ABS J/C (2)

AT ENGINE

AC500140 AC

Harness disconnection Diagnosis Item 5 P.54C-58

M.U.T. : Red section on screen or loose connection in Diagnose when the
red displayed area is M.U.T.-III cannot
estimated. receive the data sent
J/C (1)
by ETACS-ECU.

ETACS DISPLAY ABS J/C (2)

AT ENGINE

AC500140 AF
54C-16 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING

M.U.T.-III screen Diagnosis detail Reference

(The ECUs that are not adopted are not Comment page
displayed.)
Harness disconnection Diagnosis Item 6 P.54C-62
M.U.T. : Red section on screen or loose connection in Diagnose when the
red displayed area is M.U.T.-III cannot
estimated. receive the data sent
J/C (1)
by RV meter.
<Vehicles with RV
ETACS DISPLAY ABS J/C (2)
meter>

AT ENGINE

AC500140 AG

Harness disconnection Diagnosis Item 7 P.54C-65

M.U.T. : Red section on screen or loose connection in Diagnose when the
red displayed area is M.U.T.-III cannot
estimated. receive the data sent

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J/C (1)
by ABS-ECU.
<Vehicles with ABS>
ETACS DISPLAY ABS J/C (2)

AT ENGINE

AC500140 AH
 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING
54C-17
M.U.T.-III screen Diagnosis detail Reference
(The ECUs that are not adopted are not Comment page
displayed.)
Harness disconnection Diagnosis Item 8 P.54C-70
M.U.T.
: Red section on screen or loose connection in Diagnose the lines
red displayed area is between the joint
estimated. connectors (CAN1
J/C (1)
and CAN2)

ETACS DISPLAY ABS J/C (2)

AT ENGINE

AC500140 AI

Harness disconnection Diagnosis Item 9 P.54C-76

M.U.T. : Red section on screen or loose connection in Diagnose when the
red displayed area is M.U.T.-III cannot
estimated. receive the data sent

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J/C (1)
by A/T-ECU. <A/T>

ETACS DISPLAY ABS J/C (2)

AT ENGINE

AC500140 AJ

Harness disconnection Diagnosis Item 10 P.54C-80

M.U.T. : Red section on screen or loose connection in Diagnose when the
red displayed area is M.U.T.-III cannot
estimated. receive the data sent
J/C (1)
by engine-ECU.

ETACS DISPLAY ABS J/C (2)

AT ENGINE

AC500140 AK
54C-18 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING

CAN BUS DIAGNOSIS

Diagnosis Item 1: Diagnose shorts in the power supply to CAN bus line

CAUTION
When servicing a CAN bus line, earth yourself by touching a metal object such as an unpainted water
pipe. If you fail to do, a component connected to the CAN bus line may be broken.

A/T-ECU ENGINE-ECU

NOTE

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2500-SOHC
2500-DOHC,3200
2WD
4WD

DIAGNOSIS
CONNECTOR CAN ADAPTER

ABS-ECU ETACS-ECU

Wire colour code

B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Grey R : Red P : Pink V : Violet PU : Purple
 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING
54C-19
FUNCTION DIAGNOSIS PROCEDURE
When diagnosing the CAN bus lines, the M.U.T.-III
measures the voltage of CAN_H and CAN_L line and STEP 1. Check the CAN bus lines. Voltage
detects the short to power supply or ground. measurement at C-22 diagnosis connector.
TROUBLE JUDGEMENT CONDITIONS CAUTION
The M.U.T.-III judges the trouble when it is impossi- A digital multimeter should be used. For details
ble to receive the periodically sent data and the volt- refer to P.54C-5.
age of CAN_H or CAN_L line is more than 4.0 volts. CAUTION
The test wiring harness should be used. For
TROUBLESHOOTING HINTS details refer to P.54C-5.
• Malfunction of the wiring harness NOTE: This inspection allows you to check that there
• Short to power supply of the connector is a short to power supply in either CAN_H line or
• Malfunction of each ECU CAN_L line. Thus, in the following steps, check the
CAN bus line that is defective.
Connector: C-22

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Harness side
(Front side)

C-22 (B)
AC501940 AF

Connectors: C-103, C-106

C-103
Harness side

C-103 (B)

C-106 C-106
Harness side

AC501943AF

Connector: C-219 Harness side

Junction block
(Rear view)

C-219 (GR)

AC501611AB

(1) Disconnect engine-ECU connector C-106

<2500-SOHC> or C-103 <2500-DOHC, 3200>
and ETACS-ECU connector C-219, and measure
the voltage at the harness side of diagnosis
connector C-22.
54C-20 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING

(2) Connect the negative battery terminal, and turn STEP 2. Check the CAN line. Voltage
the ignition switch to the ON position. measurement at C-35 intermediate connector.
CAUTION
A digital multimeter should be used. For details
Test refer to P.54C-5.
harness
CAUTION
The test wiring harness should be used. For
details refer to P.54C-5.
Connector: C-35
Harness side: C-22

AC209365PJ
AC209365

(3) Voltage between C-22 diagnosis connector

terminal No.6 (CAN_H) and body earth
OK: 4.0 V or less

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AC501943AE
Harness side: C-22
(1) Disconnect the intermediate connector, and
measure at its male-side intermediate connector
(at the front wiring harness side).
Test (2) Connect the negative battery terminal, and turn
harness the ignition switch to the ON position.

AC209365PK
AC209365 Test harness
(4) Voltage between C-22 diagnosis connector
terminal No.14 (CAN_L) and body earth
OK: 4.0 V or less
(5) Disconnect the negative battery terminal.
Q: Is the check result normal? Mail side: C-35
YES : <Both of the measurement results show 4.0
V or less> Go to Step 12. AC209365PM
AC209365
NO : <Either of CAN_H line or CAN_L line the
measurement results show 4.0 V or less> (3) Voltage between C-35 intermediate connector
Go to Step 2. terminal No.6 (CAN_H) and body earth
OK: 4.0 V or less

Test harness

Mail side: C-35

AC209365PN
AC209365

(4) Voltage between C-35 intermediate connector

terminal No.7 (CAN_L) and body earth
OK: 4.0 V or less
(5) Disconnect the negative battery terminal.
 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING
54C-21
Q: Is the check result normal? (2) Connect the negative battery terminal, and turn
YES : <4.0 V or less> Go to Step 7. the ignition switch to the ON position.
NO : <more than 4.0 V> Go to Step 3.
Test harness
STEP 3. Check the CAN line between joint
connector (CAN2) and the engine-ECU. Voltage
measurement at C-01 joint connector (CAN2).
CAUTION
A digital multimeter should be used. For details
refer to P.54C-5. Harness side: C-01
CAUTION
The test wiring harness should be used. For AC209365PO
AC209365

details refer to P.54C-5. (3) Voltage between C-01 joint connector (CAN2)
Connector: C-01
terminal No.2 (CAN_H) and body earth
Harness side OK: 4.0 V or less

C-01 (L)

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Harness side: C-01

AC501943AD

(1) Disconnect joint connector (CAN2), and measure Test harness

at the wiring harness side. AC209365PP
AC209365

(4) Voltage between C-01 joint connector (CAN2)

terminal No.13 (CAN_L) and body earth
OK: 4.0 V or less
(5) Disconnect the negative battery terminal.
Q: Is the check result normal?
YES <M/T> : <4.0 V or less> Repair intermediate
connector (C-35), or the wiring harness
between joint connector (CAN2) and
intermediate connector (C-35).
YES <A/T> : <4.0 V or less> Go to Step 4.
NO : <more than 4.0 V> Repair the wiring
harness between joint connector (CAN2)
and the engine-ECU connector.
54C-22 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING

Q: Is the check result normal?

STEP 4. Check the CAN line between joint
YES : <4.0 V or less> Repair intermediate
connector (CAN2) and the A/T-ECU. Voltage
connector (C-35), or the wiring harness
measurement at C-01 joint connector (CAN2).
between joint connector (CAN2) and the
CAUTION intermediate connector (C-35).
A digital multimeter should be used. For details NO : <more than 4.0 V> Go to Step 5.
refer to P.54C-5.
CAUTION STEP 5. M.U.T.-III CAN bus diagnostics [A/T-ECU
The test wiring harness should be used. For connector disconnected]
details refer to P.54C-5.
Connectors: C-18, C-20
C-18
Connector: C-01 Harness side
Harness side

C-20
C-01 (L) C-20
Harness side

C-18

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AC501940AG
AC501943AD
(1) Disconnect A/T-ECU connector C-18 <2WD> or
(1) Disconnect joint connector (CAN2), and measure C-20 <4WD>, and diagnose by using the
at the wiring harness side. M.U.T.-III.
(2) Connect the negative battery terminal, and turn
the ignition switch to the ON position. : Red section on screen
M.U.T.

Test harness
J/C (1)

ETACS DISPLAY ABS J/C (2)

AT ENGINE

Harness side: C-01 AC500146 AB

AC209365PQ
AC209365
(2) Diagnose CAN bus lines, and check if M.U.T.-III
screen is as shown in the illustration.
(3) Voltage between C-01 joint connector (CAN2)
NOTE: The ECUs that are not adopted are not
terminal No.3 (CAN_H)and body earth
displayed.
OK: 4.0 V or less
Q: Does M.U.T.-III screen correspond to the
illustration?
YES : Repair the wiring harness between joint
Harness side: C-01 connector (CAN2) and the A/T-ECU
connector.
NO : Check the A/T-ECU connector, and repair if
necessary. If the A/T-ECU connector is in
good condition, Go to Step 6.

Test harness STEP 6. M.U.T.-III CAN bus diagnostics (retest the

AC209365PR
AC209365 system)
(4) Voltage between C-01 joint connector (CAN2) Diagnose CAN bus lines, and check if M.U.T.-III
terminal (CAN_L) No.14 and body earth screen shows normal state.
OK: 4.0 V or less Q: Is the check result normal?
(5) Disconnect the negative battery terminal.
 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING
54C-23
YES : The trouble can be an intermittent (2) Connect the negative battery terminal, and turn
malfunction (Refer to GROUP 00 −How to the ignition switch to the ON position.
use Troubleshooting/inspection Service
Points −How to Cope with Intermittent Test harness
Malfunction ).
NO : Check the A/T-ECU connector, and repair if
necessary. If the A/T-ECU connector is in
good condition, replace the A/T-ECU.

STEP 7. Check the CAN line between joint Harness side: C-119
connector (CAN1) and the ETACS-ECU. Voltage
measurement at C-119 joint connector (CAN1). AC209365PS
AC209365

CAUTION (3) Voltage between C-119 joint connector (CAN1)

A digital multimeter should be used. For details terminal No.3 (CAN_H) and body earth
refer to P.54C-5.
OK: 4.0 V or less
CAUTION
The test wiring harness should be used. For
details refer to P.54C-5.

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Harness side: C-119
Connector: C-119
Harness side

C-119 (GR)
Test harness
AC209365PT
AC209365

(4) Voltage between C-119 joint connector (CAN1)

AC501940AI terminal No.14 (CAN_L) and body earth
(1) Disconnect joint connector (CAN1), and measure OK: 4.0 V or less
at the wiring harness side. (5) Disconnect the negative battery terminal.
CAUTION
Strictly observe the specified wiring harness
repair procedure. For details refer to P.54C-5.
Q: Is the check result normal?
YES <vehicles without RV meter and ABS> : <4.0
V or less> Go to Step 13.
YES <vehicles with RV meter> : <4.0 V or less>
Go to Step 8.
YES <vehicles with ABS> : <4.0 V or less> Go to
Step 10.
YES <vehicles with RV meter and ABS> : <4.0 V or
less> Go to Step 8.
NO : <more than 4.0 V> Repair the wiring
harness between joint connector (CAN1)
and the ETACS-ECU connector.
54C-24 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING

STEP 8. Check the CAN line between joint (2) Connect the negative battery terminal, and turn
connector (CAN1) and the CAN adapter. Voltage the ignition switch to the ON position.
measurement at C-119 joint connector (CAN1).
Test harness
CAUTION
A digital multimeter should be used. For details
refer to P.54C-5.
CAUTION
The test wiring harness should be used. For
details refer to P.54C-5.
Harness side: C-119
Connector: C-119
Harness side AC209365PS
AC209365

(3) Voltage between C-119 joint connector (CAN1)

terminal (CAN_H) No.5 and body earth
OK: 4.0 V or less
C-119 (GR)

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Harness side: C-119
AC501940AI

(1) Disconnect joint connector (CAN1), and measure

at the wiring harness side.

Test harness
AC209365PV
AC209365

(4) Voltage between C-119 joint connector (CAN1)

terminal (CAN_L) No.16 and body earth
OK: 4.0 V or less
(5) Disconnect the negative battery terminal.
CAUTION
Strictly observe the specified wiring harness
repair procedure. For details refer to P.54C-5.
Q: Is the check result normal?
YES <vehicles without ABS> : <4.0 V or less> Go
to Step 13.
YES <vehicles with ABS> : <4.0 V or less> Go to
Step 10.
NO : <more than 4.0 V> Go to Step 9.
 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING
54C-25
Q: Does M.U.T.-III screen correspond to the
STEP 9. M.U.T.-III CAN bus diagnostics [CAN
illustration?
adapter connector disconnected] YES : Repair the wiring harness between joint
Connector: C-110 connector (CAN1) and the CAN adapter
connector.
NO : Check the CAN adapter connector, and
repair if necessary. If the CAN adapter
Harness side connector is in good condition, refer to
GROUP 54A −RV meter .

STEP 10. Check the CAN line between joint

connector (CAN1) and the ABS-ECU. Voltage
AC501940AH
measurement at C-119 joint connector (CAN1).
(1) Disconnect CAN adapter connector C-110, and CAUTION
diagnose by using the M.U.T.-III. A digital multimeter should be used. For details
refer to P.54C-5.
M.U.T.
: Red section on screen
CAUTION
The test wiring harness should be used. For

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J/C (1) details refer to P.54C-5.
Connector: C-119
ETACS DISPLAY ABS J/C (2) Harness side

AT ENGINE

AC500146 AB
C-119 (GR)
(2) Diagnose CAN bus lines, and check if M.U.T.-III
screen is as shown in the illustration.
NOTE: The ECUs that are not adopted are not
displayed. AC501940AI

(1) Disconnect joint connector (CAN1), and measure

at the wiring harness side.
54C-26 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING

(2) Connect the negative battery terminal, and turn STEP 11. M.U.T.-III CAN bus diagnostics
the ignition switch to the ON position. [ABS-ECU connector disconnected]
Connector: A-01
<2500-SOHC>
Test
harness A-01 (B)

Harness side

Harness side: C-119

AC209365PW
AC209365 AC501610AB

(3) Voltage between C-119 joint connector (CAN1)

terminal No.7 (CAN_H) and body earth Connector: A-01
<2500-DOHC, 3200>
OK: 4.0 V or less
A-01 (B)

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Harness side: C-119 Harness side

AC501971AC
Test
harness (1) Disconnect ABS-ECU connector A-01, and
diagnose by using the M.U.T.-III.
AC209365PX
AC209365

(4) Voltage between C-119 joint connector (CAN1) M.U.T.

: Red section on screen

terminal No.18 (CAN_L) and body earth

OK: 4.0 V or less J/C (1)

(5) Disconnect the negative battery terminal.

CAUTION ETACS DISPLAY ABS J/C (2)

Strictly observe the specified wiring harness

repair procedure. For details refer to P.54C-5. AT ENGINE

Q: Is the check result normal? AC500146 AB

YES : <4.0 V or less> Go to Step 13.
(2) Diagnose CAN bus lines, and check if M.U.T.-III
NO : <more than 4.0 V> Go to Step 11.
screen is as shown in the illustration.
NOTE: The ECUs that are not adopted are not
displayed.
Q: Does M.U.T.-III screen correspond to the
illustration?
YES : Check the intermediate connector (C-13),
and repair if necessary. If the intermediate
connector is in good condition, repair the
wiring harness between joint connector
(CAN1) and the ABS-ECU connector.
NO : Check the ABS-ECU connector, and repair
if necessary. If the ABS-ECU connector is in
good condition, go to Step 12.
 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING
54C-27
STEP 12. M.U.T.-III CAN bus diagnostics (retest (2) Connect the negative battery terminal, and turn
the system) the ignition switch to the ON position.
Diagnose CAN bus lines, and check if M.U.T.-III
screen shows normal state. Test harness

Q: Is the check result normal?

YES : The trouble can be an intermittent
malfunction (Refer to GROUP 00 −How to
use Troubleshooting/inspection Service
Points −How to Cope with Intermittent
Malfunction ). Harness side: C-119
NO : Check the ABS-ECU connector, and repair
if necessary. If the ABS-ECU connector is in AC209365PY
AC209365

good condition, replace the ABS-ECU. (3) Voltage between C-119 joint connector (CAN1)
terminal No.2 (CAN_H) and body earth
STEP 13. Check the CAN line between joint OK: Less than 1.0 V
connector (CAN1) and the diagnosis connector.
Voltage measurement at C-119 joint connector
(CAN1).

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Harness side: C-119
CAUTION
A digital multimeter should be used. For details
refer to P.54C-5.
CAUTION
The test wiring harness should be used. For
details refer to P.54C-5. Test harness
Connector: C-119 AC209365PZ
AC209365

Harness side (4) Voltage between C-119 joint connector (CAN1)

terminal No.13 (CAN_L) and body earth
OK: Less than 1.0 V
(5) Disconnect the negative battery terminal.
C-119 (GR)
CAUTION
Strictly observe the specified wiring harness
repair procedure. For details refer to P.54C-5.
AC501940AI
Q: Is the check result normal?
(1) Disconnect joint connector (CAN1), and measure YES : <Less than 1.0 V> Repair the intermediate
at the wiring harness side. connector, or the wiring harness between
joint connector (CAN1) and the intermediate
connector (C-35).
NO : <1.0 V or more> Repair the diagnosis
connector, or the wiring harness between
joint connector (CAN1) and the diagnosis
connector.
54C-28 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING

YES : The trouble can be an intermittent

STEP 14. M.U.T.-III CAN bus diagnostics
malfunction (Refer to GROUP 00 −How to
[engine-ECU connector disconnected]
use Troubleshooting/inspection Service
Connectors: C-103, C-106 Points −How to Cope with Intermittent
C-103 Malfunction ).
Harness side NO : Check the engine-ECU connector, and
repair if necessary. If the engine-ECU
C-103 (B)
connector is in good condition, replace the
engine-ECU.
C-106 C-106
Harness side
STEP 16. M.U.T.-III CAN bus diagnostics
[ETECS-ECU connector disconnected]
AC501943AF

(1) Disconnect engine-ECU connector C-106 Connector: C-219 Harness side

Junction block
<2500-SOHC> or C-103 <2500-DOHC, 3200>,
(Rear view)
and diagnose by using the M.U.T.-III.
C-219 (GR)
M.U.T.
: Red section on screen

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J/C (1)

AC501611AB
ETACS DISPLAY ABS J/C (2)

(1) Disconnect ETACS-ECU connector C-219, and

AT ENGINE
diagnose by using the M.U.T.-III.
AC500146 AB
M.U.T.
: Red section on screen
(2) Diagnose CAN bus lines, and check if M.U.T.-III
screen is as shown in the illustration.
J/C (1)
NOTE: The ECUs that are not adopted are not
displayed.
ETACS DISPLAY ABS J/C (2)

Q: Does M.U.T.-III screen correspond to the

illustration?
YES : The trouble can be an intermittent AT ENGINE

malfunction (Refer to GROUP 00 −How to AC500146 AB

use Troubleshooting/inspection Service
(2) Diagnose CAN bus lines, and check if M.U.T.-III
Points −How to Cope with Intermittent
screen is as shown in the illustration.
Malfunction ).
NO : Check the engine-ECU connector, and NOTE: The ECUs that are not adopted are not
repair if necessary. If the engine-ECU displayed.
connector is in good condition, go to Step Q: Does M.U.T.-III screen correspond to the
15. illustration?
YES : The trouble can be an intermittent
STEP 15. M.U.T.-III CAN bus diagnostics (retest malfunction (Refer to GROUP 00 −How to
the system) use Troubleshooting/inspection Service
Diagnose CAN bus lines, and check if M.U.T.-III Points −How to Cope with Intermittent
screen shows normal state. Malfunction ).
NO : Check the ETACS-ECU connector, and
Q: Is the check result normal? repair if necessary. If the ETACS-ECU
connector is in good condition, go to Step
17.
 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING
54C-29
YES : The trouble can be an intermittent
STEP 17. M.U.T.-III CAN bus diagnostics (retest
malfunction (Refer to GROUP 00 −How to
the system)
use Troubleshooting/inspection Service
Diagnose CAN bus lines, and check if M.U.T.-III
Points −How to Cope with Intermittent
screen shows normal state.
Malfunction ).
Q: Is the check result normal? NO : Check the ETACS-ECU connector, and
repair if necessary. If the ETACS-ECU
connector is in good condition, replace the
ETACS-ECU.

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54C-30 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING

Diagnosis Item 2: Diagnose shorts in the ground to CAN bus line

CAUTION
When servicing a CAN bus line, earth yourself by touching a metal object such as an unpainted water
pipe. If you fail to do, a component connected to the CAN bus line may be broken.

A/T-ECU ENGINE-ECU

NOTE
2500-SOHC
2500-DOHC,3200

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2WD
4WD

DIAGNOSIS
CONNECTOR CAN ADAPTER

ABS-ECU ETACS-ECU

Wire colour code

B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Grey R : Red P : Pink V : Violet PU : Purple
 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING
54C-31
FUNCTION TROUBLESHOOTING HINTS
When diagnosing the CAN bus lines, the M.U.T.-III • Malfunction of the wiring harness
measures the voltage of CAN_H and CAN_L line and • Malfunction of the connector
detects the short to power supply or ground. • Malfunction of each ECU

TROUBLE JUDGEMENT CONDITIONS

The M.U.T.-III judges the trouble when it is impossi-
ble to receive the periodically sent data and the volt-
age of CAN_H or CAN_L line is less than 1.0 volt.

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54C-32 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING

DIAGNOSIS PROCEDURE CAUTION

When measuring the resistance, disconnect the
STEP 1.Check the CAN bus lines. Resistance negative battery terminal. For details refer to
measurement at C-22 diagnosis connector. P.54C-5.
(2) Ensure that the negative battery terminal is
CAUTION
disconnected.
A digital multimeter should be used. For details
refer to P.54C-5.
CAUTION
The test wiring harness should be used. For Test
details refer to P.54C-5. harness

NOTE: This inspection allows you to check that there

is a short to ground in either CAN_H line or CAN_L
line. Thus, in the following steps, check the CAN bus
line that is defective. Harness side: C-22

Connector: C-22 AC209364RJ

(3) Resistance between C-22 diagnosis connector

terminal No.6 (CAN_H) and body earth

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Harness side
(Front side) OK: 1 kΩ or more

C-22 (B) Harness side: C-22

AC501940 AF

Connectors: C-103, C-106

C-103 Test
Harness side harness

C-103 (B) AC209364

AC209364RK

(4) Resistance between C-22 diagnosis connector

C-106 C-106
Harness side terminal No.14 (CAN_L) and body earth
OK: 1 kΩ or more
AC501943AF Q: Is the check result normal?
YES : <Both of the measurement results show 1
Connector: C-219 Harness side kΩ or more> Go to Step 12.
Junction block NO : <Either of CAN_H line or CAN_L line the
(Rear view) measurement results show 1 kΩ or more>
Go to Step 2.
C-219 (GR)

AC501611AB

(1) Disconnect engine-ECU connector C-106

<2500-SOHC> or C-103 <2500-DOHC, 3200>
and ETACS-ECU connector C-219, and measure
the resistance at harness side of diagnosis
connector C-22.
 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING
54C-33
STEP 2. Check the CAN line. Resistance
measurement at C-35 intermediate connector.
CAUTION Test harness
A digital multimeter should be used. For details
refer to P.54C-5.
CAUTION
The test wiring harness should be used. For Mail side: C-35
details refer to P.54C-5.
Connector: C-35 AC209364RN

(4) Resistance between C-35 intermediate connector

terminal No.7 (CAN_L) and body earth
OK: 1 kΩ or more
Q: Is the check result normal?
YES : <1 kΩ or more> Go to Step 7.
NO : <less than 1 kΩ > Go to Step 3.

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AC501943AE

(1) Disconnect the intermediate connector (C-35),

and measure at its male-side intermediate
connector (at the front wiring harness side).
CAUTION
When measuring the resistance, disconnect the
negative battery terminal. For details refer to
P.54C-5.
(2) Ensure that the negative battery terminal is
disconnected.

Test harness

Mail side: C-35

AC209364RM

(3) Resistance between C-35 intermediate connector

terminal No.6 (CAN_H) and body earth
OK: 1 kΩ or more
54C-34 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING

STEP 3. Check the CAN line between joint

connector (CAN2) and the engine-ECU.
Resistance measurement at C-01 joint connector Harness side: C-01
(CAN2).
CAUTION
A digital multimeter should be used. For details
refer to P.54C-5.
CAUTION
Test harness
The test wiring harness should be used. For
AC209364RP
details refer to P.54C-5.
(4) Resistance between C-01 joint connector (CAN2)
Connector: C-01
terminal No.13 (CAN_L) and body earth
Harness side
OK: 1 kΩ or more
Q: Is the check result normal?
C-01 (L)
YES <M/T> : <1 kΩ or more> Repair intermediate
connector (C-35), or the wiring harness
between joint connector (CAN2) and
intermediate connector (C-35).

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YES <A/T> : <1 kΩ or more> Go to Step 4.
AC501943AD NO : <less than 1 kΩ > Repair the wiring harness
(1) Disconnect joint connector (CAN2), and measure between joint connector (CAN2) and the
at the wiring harness side. engine-ECU connector.
CAUTION
When measuring the resistance, disconnect the
negative battery terminal. For details refer to
P.54C-5.
(2) Ensure that the negative battery terminal is
disconnected.

Test harness

Harness side: C-01

AC209364RO

(3) Resistance between C-01 joint connector (CAN2)

terminal No.2 (CAN_H) and body earth
OK: 1 kΩ or more
 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING
54C-35
STEP 4. Check the CAN line between joint
connector (CAN2) and the A/T-ECU. Resistance
measurement at C-01 joint connector (CAN2). Harness side: C-01
CAUTION
A digital multimeter should be used. For details
refer to P.54C-5.
CAUTION
The test wiring harness should be used. For
Test harness
details refer to P.54C-5.
AC209364RR
Connector: C-01
(4) Resistance between C-01 joint connector (CAN2)
Harness side
terminal No.14 (CAN_L) and body earth
OK: 1 kΩ or more
C-01 (L)
Q: Is the check result normal?
YES : <1 kΩ or more> Repair intermediate
connector (C-35), or the wiring harness
between joint connector (CAN2) and
intermediate connector (C-35).

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AC501943AD NO : <less than 1 kΩ > Go to Step 5.
(1) Disconnect joint connector (CAN2), and measure
at the wiring harness side. STEP 5. M.U.T.-III CAN bus diagnostics [A/T-ECU
CAUTION connector disconnected]
When measuring the resistance, disconnect the Connectors: C-18, C-20
C-18
negative battery terminal. For details refer to Harness side
P.54C-5.
(2) Ensure that the negative battery terminal is
C-20
disconnected.
C-20
Harness side
Test harness
C-18

AC501940AG

(1) Disconnect A/T-ECU connector C-18 <2WD> or

C-20 <4WD>, and diagnose by using the
Harness side: C-01 M.U.T.-III.

AC209364RQ

(3) Resistance between C-01 joint connector (CAN2)

terminal No.3 (CAN_H) and body earth
OK: 1 kΩ or more
54C-36 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING

YES : Repair the wiring harness between joint

M.U.T.
: Red section on screen connector (CAN2) and the A/T-ECU
connector.
NO : Check the A/T-ECU connector, and repair if
J/C (1)
necessary. If the A/T-ECU connector is in
good condition, Go to Step 6.
ETACS DISPLAY ABS J/C (2)

STEP 6. M.U.T.-III CAN bus diagnostics (retest the

AT ENGINE system)
AC500146 AB
Diagnose CAN bus lines, and check if M.U.T.-III
screen shows normal state.
(2) Diagnose CAN bus lines, and check if M.U.T.-III
screen is as shown in the illustration. Q: Is the check result normal?
YES : The trouble can be an intermittent
NOTE: The ECUs that are not adopted are not
malfunction (Refer to GROUP 00 −How to
displayed.
use Troubleshooting/inspection Service
Q: Does M.U.T.-III screen correspond to the Points −How to Cope with Intermittent
illustration? Malfunction ).
NO : Check the A/T-ECU connector, and repair if
necessary. If the A/T-ECU connector is in

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good condition, replace the A/T-ECU.
 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING
54C-37
STEP 7. Check CAN line between joint connector
(CAN1) and the ETACS-ECU. Resistance
measurement at C-119 joint connector (CAN1). Harness side: C-119
CAUTION
A digital multimeter should be used. For details
refer to P.54C-5.
CAUTION
The test wiring harness should be used. For
Test harness
details refer to P.54C-5.
AC209364RT
Connector: C-119
(4) Resistance between C-119 joint connector
Harness side
(CAN1) terminal No.14 (CAN_L) and body earth
OK: 1 kΩ or more
CAUTION
C-119 (GR) Strictly observe the specified wiring harness
repair procedure. For details refer to P.54C-5.
Q: Is the check result normal?

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YES <vehicles without RV meter and ABS> : <1 kΩ
AC501940AI
or more> Go to Step 13.
(1) Disconnect joint connector (CAN1), and measure YES <vehicles with RV meter> : <1 kΩ or more>
at the wiring harness side. Go to Step 8.
CAUTION YES <vehicles with ABS> : <1 kΩ or more> Go to
When measuring the resistance, disconnect the Step 10.
negative battery terminal. For details refer to YES <vehicles with RV meter and ABS> : <1 kΩ or
P.54C-5. more> Go to Step 8.
(2) Ensure that the negative battery terminal is NO : <less than 1 kΩ > Repair the wiring harness
disconnected. between joint connector (CAN1) and the
ETACS-ECU connector.
Test harness

Harness side: C-119

AC209364RS

(3) Resistance between C-119 joint connector

(CAN1) terminal No.3 (CAN_H) and body earth
OK: 1 kΩ or more
54C-38 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING

STEP 8. Check the CAN line between joint

connector (CAN1) and the CAN adapter.
Resistance measurement at C-119 joint Harness side: C-119
connector (CAN1).
CAUTION
A digital multimeter should be used. For details
refer to P.54C-5.
CAUTION
Test harness
The test wiring harness should be used. For
AC209364RV
details refer to P.54C-5.
(4) Resistance between C-119 joint connector
Connector: C-119
(CAN1) terminal No.16 (CAN_L) and body earth
Harness side
OK: 1 kΩ or more
CAUTION
Strictly observe the specified wiring harness
C-119 (GR) repair procedure. For details refer to P.54C-5.
Q: Is the check result normal?

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YES <vehicles without ABS> : <1 kΩ or more> Go
to Step 13.
AC501940AI
YES <vehicles with ABS> : <1 kΩ or more> Go to
(1) Disconnect joint connector (CAN1), and measure Step 10.
at the wiring harness side. NO : <less than 1 kΩ > Go to Step 9.
CAUTION
When measuring the resistance, disconnect the STEP 9. M.U.T.-III CAN bus diagnostics [CAN
negative battery terminal. For details refer to adapter connector disconnected]
P.54C-5.
Connector: C-110
(2) Ensure that the negative battery terminal is
disconnected.

Test harness Harness side

AC501940AH
Harness side: C-119 (1) Disconnect CAN adapter connector C-110, and
diagnose by using the M.U.T.-III.
AC209364RU

(3) Resistance between C-119 joint connector

(CAN1) terminal No.5 (CAN_H) and body earth
OK: 1 kΩ or more
 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING
54C-39
NOTE: The ECUs that are not adopted are not
M.U.T.
: Red section on screen displayed.
Q: Does M.U.T.-III screen correspond to the
J/C (1)
illustration?
YES : Repair the wiring harness between joint
connector (CAN1) and the CAN adapter
ETACS DISPLAY ABS J/C (2)
connector.
NO : Check the CAN adapter connector, and
AT ENGINE repair if necessary. If the CAN adapter
AC500146 AB
connector is in good condition, refer to
GROUP 54A −RV meter .
(2) Diagnose CAN bus lines, and check if M.U.T.-III
screen is as shown in the illustration.

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54C-40 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING

STEP 10. Check the CAN line between joint

connector (CAN1) and the ABS-ECU. Resistance
measurement at C-119 joint connector (CAN1). Harness side: C-119
CAUTION
A digital multimeter should be used. For details
refer to P.54C-5.
Test
CAUTION harness
The test wiring harness should be used. For
details refer to P.54C-5.
AC209364RX
Connector: C-119
(4) Resistance between C-119 joint connector
Harness side
(CAN1) terminal No.18 (CAN_L) and body earth
OK: 1 kΩ or more
CAUTION
C-119 (GR) Strictly observe the specified wiring harness
repair procedure. For details refer to P.54C-5.
Q: Is the check result normal?

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YES : <1 kΩ or more> Go to Step 13.
AC501940AI
NO : <less than 1 kΩ > Go to Step 11.
(1) Disconnect joint connector (CAN1), and measure
at the wiring harness side.
CAUTION
When measuring the resistance, disconnect the
negative battery terminal. For details refer to
P.54C-5.
(2) Ensure that the negative battery terminal is
disconnected.

Test
harness

Harness side: C-119

AC209364RW

(3) Resistance between C-119 joint connector

(CAN1) terminal No.7 (CAN_H) and body earth
OK: 1 kΩ or more
 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING
54C-41
STEP 11. M.U.T.-III CAN bus diagnostics NOTE: The ECUs that are not adopted are not
[ABS-ECU connector disconnected] displayed.
Q: Does M.U.T.-III screen correspond to the
Connector: A-01
<2500-SOHC> illustration?
YES : Check intermediate connector (C-13), and
A-01 (B) repair if necessary. If the intermediate
connector is in good condition, repair the
wiring harness between joint connector
Harness side (CAN1) and the ABS-ECU connector.
NO : Check the ABS-ECU connector, and repair
if necessary. If the ABS-ECU connector is in
good condition, go to Step 12.
AC501610AB

Connector: A-01 STEP 12. M.U.T.-III CAN bus diagnostics (retest

<2500-DOHC, 3200> the system)
Diagnose CAN bus lines, and check if M.U.T.-III
A-01 (B)
screen shows normal state.
Q: Is the check result normal?

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Harness side YES : The trouble can be an intermittent
malfunction (Refer to GROUP 00 −How to
use Troubleshooting/inspection Service
Points −How to Cope with Intermittent
AC501971AC
Malfunction ).
(1) Disconnect ABS-ECU connector A-01, and NO : Check the ABS-ECU connector, and repair
diagnose by using the M.U.T.-III. if necessary. If the ABS-ECU connector is in
good condition, replace the ABS-ECU.
M.U.T.
: Red section on screen

J/C (1)

ETACS DISPLAY ABS J/C (2)

AT ENGINE

AC500146 AB

(2) Diagnose CAN bus lines, and check if M.U.T.-III

screen is as shown in the illustration.
54C-42 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING

STEP 13. Check the CAN line between joint

connector (CAN1) and the diagnosis connector.
Resistance measurement at C-119 joint Harness side: C-119
connector (CAN1).
CAUTION
A digital multimeter should be used. For details
refer to P.54C-5.
CAUTION
Test harness
The test wiring harness should be used. For
AC209364RZ
details refer to P.54C-5.
(4) Resistance between C-119 joint connector
Connector: C-119
(CAN1) terminal No.13 (CAN_L) and body earth
Harness side
OK: Less than 1.0 V
CAUTION
Strictly observe the specified wiring harness
C-119 (GR) repair procedure. For details refer to P.54C-5.
Q: Is the check result normal?

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YES : <1 kΩ or more> Repair the intermediate
connector (C-35), or the wiring harness
AC501940AI
between joint connector (CAN1) and the
(1) Disconnect joint connector (CAN1), and measure intermediate connector (C-35).
at the wiring harness side. NO : <less than 1 kΩ > Repair the diagnosis
CAUTION connector, or the wiring harness between
When measuring the resistance, disconnect the joint connector (CAN1) and the diagnosis
negative battery terminal. For details refer to connector.
P.54C-5.
(2) Ensure that the negative battery terminal is
disconnected.

Test harness

Harness side: C-119

AC209364RY

(3) Resistance between C-119 joint connector

(CAN1) terminal No.2 (CAN_H) and body earth
OK: Less than 1.0 V
 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING
54C-43
YES : The trouble can be an intermittent
STEP 14. M.U.T.-III CAN bus diagnostics
malfunction (Refer to GROUP 00 −How to
[engine-ECU connector disconnected]
use Troubleshooting/inspection Service
Connectors: C-103, C-106 Points −How to Cope with Intermittent
C-103 Malfunction ).
Harness side NO : Check the engine-ECU connector, and
repair if necessary. If the engine-ECU
C-103 (B)
connector is in good condition, replace the
engine-ECU.
C-106 C-106
Harness side
STEP 16. M.U.T.-III CAN bus diagnostics
[ETECS-ECU connector disconnected]
AC501943AF

(1) Disconnect engine-ECU connector C-106 Connector: C-219 Harness side

Junction block
<2500-SOHC> or C-103 <2500-DOHC, 3200>,
(Rear view)
and diagnose by using the M.U.T.-III.
C-219 (GR)
M.U.T.
: Red section on screen

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J/C (1)

AC501611AB
ETACS DISPLAY ABS J/C (2)

(1) Disconnect ETACS-ECU connector C-219, and

AT ENGINE
diagnose by using the M.U.T.-III.
AC500146 AB
M.U.T.
: Red section on screen
(2) Diagnose CAN bus lines, and check if M.U.T.-III
screen is as shown in the illustration.
J/C (1)
NOTE: The ECUs that are not adopted are not
displayed.
ETACS DISPLAY ABS J/C (2)

Q: Does M.U.T.-III screen correspond to the

illustration?
YES : The trouble can be an intermittent AT ENGINE

malfunction (Refer to GROUP 00 −How to AC500146 AB

use Troubleshooting/inspection Service
(2) Diagnose CAN bus lines, and check if M.U.T.-III
Points −How to Cope with Intermittent
screen is as shown in the illustration.
Malfunction ).
NO : Check the engine-ECU connector, and NOTE: The ECUs that are not adopted are not
repair if necessary. If the engine-ECU displayed.
connector is in good condition, go to Step Q: Does M.U.T.-III screen correspond to the
15. illustration?
YES : The trouble can be an intermittent
STEP 15. M.U.T.-III CAN bus diagnostics (retest malfunction (Refer to GROUP 00 −How to
the system) use Troubleshooting/inspection Service
Diagnose CAN bus lines, and check if M.U.T.-III Points −How to Cope with Intermittent
screen shows normal state. Malfunction ).
NO : Check the ETACS-ECU connector, and
Q: Is the check result normal? repair if necessary. If the ETACS-ECU
connector is in good condition, go to Step
17.
54C-44 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING

YES : The trouble can be an intermittent

STEP 17. M.U.T.-III CAN bus diagnostics (retest
malfunction (Refer to GROUP 00 −How to
the system)
use Troubleshooting/inspection Service
Diagnose CAN bus lines, and check if M.U.T.-III
Points −How to Cope with Intermittent
screen shows normal state.
Malfunction ).
Q: Is the check result normal? NO : Check the ETACS-ECU connector, and
repair if necessary. If the ETACS-ECU
connector is in good condition, replace the
ETACS-ECU.

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 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING
54C-45

Diagnosis Item 3: Diagnose shorts between CAN_H and L lines

CAUTION
When servicing a CAN bus line, earth yourself by touching a metal object such as an unpainted water
pipe. If you fail to do, a component connected to the CAN bus line may be broken.

A/T-ECU ENGINE-ECU

NOTE
2500-SOHC
2500-DOHC,3200

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2WD
4WD

DIAGNOSIS
CONNECTOR CAN ADAPTER

ABS-ECU ETACS-ECU

Wire colour code

B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Grey R : Red P : Pink V : Violet PU : Purple
54C-46 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING

FUNCTION STEP 2. Resistance measurement at C-35

The M.U.T.-III judges a short between CAN_H and intermediate connector.
CAN_L line when all data from ECU cannot be
CAUTION
received while checking periodically sent data from
A digital multimeter should be used. For details
each ECU even if the voltage is normal.
refer to P.54C-5.
TROUBLE JUDGEMENT CONDITIONS CAUTION
The M.U.T.-III judges the trouble when it is impossi- The test wiring harness should be used. For
ble to send and receive the all ECU periodically sent details refer to P.54C-5.
data and the voltage of CAN_H and CAN_L line is Connector: C-35
4.0 volts or less and 1.0 volt or more.

TROUBLESHOOTING HINTS
• Malfunction of the wiring harness
NOTE: The M.U.T.-III cannot receive all the periodi-
cally sent data from each ECU by the open circuit
of harness between the diagnosis connector, the
joint connector (CAN1) and the joint connector
(CAN2). In addition, the M.U.T.-III measures the

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AC501943AE

voltage itself and shows 2.5 volts due to the open (1) Disconnect the connector, and measure at its
circuit of harness. Therefore, it is judged as a female-side intermediate connector (at the
short between CAN_H and CAN_L line. instrument panel wiring harness side).
• Malfunction of the connector (2) Turn the ignition switch to the LOCK (OFF)
• Malfunction of each ECU position.
CAUTION
DIAGNOSIS PROCEDURE When measuring the resistance, disconnect the
negative battery terminal. For details refer to
STEP 1. Connector check: C-35 intermediate P.54C-5.
connector (3) Ensure that the negative battery terminal is
CAUTION disconnected.
Connector: C-35 Test harness

Test harness

Femail side: C-35

AC501943AE AC204738HD
AC204738

The strand end of the twist wire should be within (4) Resistance between C-35 intermediate connector
10 cm from the connector. For details refer to terminal Nos.6 and 7
P.54C-5. OK: 120 ± 20 Ω
Q: Is the check result normal? Q: Is the check result normal?
YES : Go to Step 2. YES : <Within 120 ± 20 Ω> Go to Step 3.
NO : Repair the defective connector. NO : <Not within 120 ± 20 Ω> Go to Step 8.
 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING
54C-47
STEP 3. Connector check: C-01 joint connector STEP 4. Resistance measurement at C-01 joint
(CAN2) connector (CAN2).
CAUTION CAUTION
Connector: C-01 A digital multimeter should be used. For details
refer to P.54C-5.
Harness side
CAUTION
The test wiring harness should be used. For
C-01 (L)
details refer to P.54C-5.
Connector: C-01
Harness side

AC501943AD C-01 (L)

The strand end of the twist wire should be within

10 cm from the connector. For details refer to
P.54C-5.

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AC501943AD

(1) Disconnect the connector, and measure at the

Short pin wiring harness side.
(2) Turn the ignition switch to the LOCK (OFF)
position.
CAUTION
When measuring the resistance, disconnect the
1 2 3 4 5 6 7 8 9 10 11
negative battery terminal. For details refer to
12 13 14 15 16 17 18 19 20 21 22
AC209350AC P.54C-5.
When checking the joint connector, ensure that its (3) Ensure that the negative battery terminal is
wiring harness side and its short pins are not dam- disconnected.
aged.
Test harness
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair a defective connector or replace the
Harness side: C-01
joint connector.

Test harness

AC204738HE

(4) Resistance between C-01 joint connector (CAN2)

terminal Nos.2 and 13
OK: 120 ± 20 Ω
CAUTION
Strictly observe the specified wiring harness
repair procedure. For details refer to P.54C-5.
Q: Is the check result normal?
YES <M/T> : <Within 120 ± 20 Ω> Repair the wiring
harness between joint connector (CAN2)
and the engine-ECU connector.
YES <A/T> : <Within 120 ± 20 Ω> Go to Step 6.
NO : <Not within 120 ± 20 Ω> Go to Step 5.
54C-48 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING

Q: Is the check result normal?

STEP 5. Resistance measurement at C-106
YES : <Within 120 ± 20 Ω> Repair the wiring
<2500-SOHC> or C-103 <2500-DOHC, 3200>
harness between joint connector (CAN2)
engine-ECU connector.
and the engine-ECU connector.
CAUTION NO : <Not within 120 ± 20 Ω> Check the
A digital multimeter should be used. For details engine-ECU connector, and repair if
refer to P.54C-5. necessary. If the engine-ECU connector is
Connectors: C-103, C-106 in good condition, replace the engine-ECU.
C-103
Harness side
STEP 6. Resistance measurement at C-01 joint
connector (CAN2).
C-103 (B)
CAUTION
C-106 C-106 A digital multimeter should be used. For details
Harness side refer to P.54C-5.
CAUTION
AC501943AF
The test wiring harness should be used. For
details refer to P.54C-5.
(1) Remove the engine-ECU, and measure at the
equipment side. Connector: C-01

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Harness side
Equipment side: C-106

C-01 (L)
Test harness

AC501943AD
Test harness
(1) Disconnect the connector, and measure at the
AC204738HF
AC204738
wiring harness side.
(2) Resistance between C-106 engine-ECU
connector terminal Nos.10 and 23 <2500-SOHC>
OK: 120 ± 20 Ω

Equipment side: C-103

Test
harness

Test
harness
AC204738HG
AC204738

(3) Resistance between C-103 engine-ECU

connector terminal Nos.117 and 125
<2500-DOHC, 3200>
OK: 120 ± 20 Ω
CAUTION
Strictly observe the specified wiring harness
repair procedure. For details refer to P.54C-5.
 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING
54C-49
(2) Turn the ignition switch to the LOCK (OFF) YES : <1 kΩ or more> Repair the wiring harness
position. between joint connector (CAN2) and
CAUTION intermediate connector (C-35).
NO : <Less than 1 kΩ> Go to Step 7.
When measuring the resistance, disconnect the
negative battery terminal. For details refer to
P.54C-5.
(3) Ensure that the negative battery terminal is
disconnected.

Test harness

Harness side: C-01

Test harness

AC204738HH

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(4) Resistance between C-01 joint connector (CAN2)
terminal Nos.3 and 14
OK: 1 kΩ or more
CAUTION
Strictly observe the specified wiring harness
repair procedure. For details refer to P.54C-5.
Q: Is the check result normal?
54C-50 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING

STEP 7. Resistance measurement at C-18 <2WD> A/T-ECU connector.

NO : <Less than 1 kΩ> Check the A/T-ECU
or C-20 <4WD> A/T-ECU connector.
connector, and repair if necessary. If the
CAUTION A/T-ECU connector is in good condition,
A digital multimeter should be used. For details replace the A/T-ECU.
refer to P.54C-5.
Connectors: C-18, C-20
C-18 STEP 8. Connector check: C-119 joint connector
Harness side (CAN1)
CAUTION
C-20
Connector: C-119
C-20 Harness side
Harness side

C-18

AC501940AG C-119 (GR)

(1) Remove the A/T-ECU, and measure at the
equipment side.

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AC501940AI
Equipment side: C-18
The strand end of the twist wire should be within
Test harness 10 cm from the connector. For details refer to
P.54C-5.

Test harness Short pin

AC204738HI
AC204738

(2) Resistance between C-18 A/T-ECU connector

terminal Nos.16 and 24 <2WD>
OK: 1 kΩ or more 1 2 3 4 5 6 7 8 9 10 11
12 13 14 15 16 17 18 19 20 21 22
AC209350 AC
Test harness
When checking the joint connector, ensure that its
wiring harness side and its short pins are not dam-
aged.
Test harness Q: Is the check result normal?
YES : Go to Step 9.
NO : Repair a defective connector or replace the
joint connector.
Equipment side: C-20
AC204738HJ
AC204738

(3) Resistance between C-20 A/T-ECU connector

terminal Nos.53 and 54 <4WD>
OK: 1 kΩ or more
CAUTION
Strictly observe the specified wiring harness
repair procedure. For details refer to P.54C-5.
Q: Is the check result normal?
YES : <1 kΩ or more> Repair the wiring harness
between joint connector (CAN2) and the
 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING
54C-51
YES <vehicles without RV meter and ABS> :
STEP 9. Resistance measurement at C-119 joint
<Within 120 ± 20 Ω> Go to Step 15.
connector (CAN1).
YES <vehicles with RV meter> : <Within 120 ± 20
CAUTION Ω> Go to Step 11.
A digital multimeter should be used. For details YES <vehicles with ABS> : <Within 120 ± 20 Ω>
refer to P.54C-5. Go to Step 13.
CAUTION YES <vehicles with RV meter and ABS> : <Within
The test wiring harness should be used. For 120 ± 20 Ω> Go to Step 11.
details refer to P.54C-5. NO : <Not within 120 ± 20 Ω> Go to Step 10.

Connector: C-119
Harness side STEP 10. Resistance measurement at C-219
ETACS-ECU connector.
CAUTION
A digital multimeter should be used. For details
C-119 (GR) refer to P.54C-5.
Connector: C-219 Harness side
Junction block
(Rear view)

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AC501940AI

(1) Disconnect joint connector (CAN1), and measure C-219 (GR)

at the wiring harness side.
(2) Turn the ignition switch to the LOCK (OFF)
position.
CAUTION
When measuring the resistance, disconnect the AC501611AB

negative battery terminal. For details refer to (1) Remove the ETACS-ECU, and measure at the
P.54C-5. equipment side.
(3) Ensure that the negative battery terminal is
disconnected. Equipment side: C-219

Test harness Test

harness

Harness side: C-119

Test
Test harness harness
AC204738HL
AC204738

(2) Resistance at C-219 ETACS-ECU connector

AC204738HK
terminal Nos.56 and 65
(4) Resistance between C-119 joint connector OK: 120 ± 20 Ω
(CAN1) terminal Nos.3 and 14
Q: Is the check result normal?
OK: 120 ± 20 Ω
YES : <Within 120 ± 20 Ω> Repair the wiring
CAUTION harness between joint connector (CAN1)
Strictly observe the specified wiring harness and the ETACS-ECU connector.
repair procedure. For details refer to P.54C-5. NO : <Not within 120 ± 20 Ω> Check the
ETACS-ECU connector, and repair if
Q: Is the check result normal?
necessary. If the ETACS-ECU connector is
in good condition, replace the ETACS-ECU.
54C-52 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING

STEP 11. Resistance measurement at C-119 joint STEP 12. Resistance measurement at C-110 CAN
connector (CAN1). adapter connector.
CAUTION CAUTION
A digital multimeter should be used. For details A digital multimeter should be used. For details
refer to P.54C-5. refer to P.54C-5.
CAUTION Connector: C-110
The test wiring harness should be used. For
details refer to P.54C-5.
Connector: C-119
Harness side
Harness side

C-119 (GR)
AC501940AH

(1) Remove the CAN adapter, and measure at the

equipment side.

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AC501940AI

(1) Disconnect joint connector (CAN1), and measure

at the wiring harness side. Equipment side: C-110
(2) Turn the ignition switch to the LOCK (OFF)
position.
CAUTION Test harness
When measuring the resistance, disconnect the Test
negative battery terminal. For details refer to harness
P.54C-5.
(3) Ensure that the negative battery terminal is AC204738HN
AC204738

disconnected. (2) Resistance at C-110 CAN adapter connector

terminal Nos.5 and 6
Test harness
OK: 1 kΩ or more
Q: Is the check result normal?
Harness side: C-119 YES : <1 kΩ or more> Repair the wiring harness
between joint connector (CAN1) and the
CAN adapter connector.
Test harness
NO : <Less than 1 kΩ> Check the CAN adapter
connector, and repair if necessary. If the
CAN adapter connector is in good condition,
AC204738HM replace the CAN adapter.
(4) Resistance between C-119 joint connector
(CAN1) terminal Nos.1 and 12
OK: 1 kΩ or more
CAUTION
Strictly observe the specified wiring harness
repair procedure. For details refer to P.54C-5.
Q: Is the check result normal?
YES <vehicles without ABS> : <1 kΩ or more> Go
to Step 15.
YES <vehicles with ABS> : <1 kΩ or more> Go to
Step 13.
NO : <Less than 1 kΩ> Go to Step 12.
 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING
54C-53
STEP 13. Resistance measurement at C-119 joint (2) Turn the ignition switch to the LOCK (OFF)
connector (CAN1). position.

CAUTION CAUTION
A digital multimeter should be used. For details When measuring the resistance, disconnect the
refer to P.54C-5. negative battery terminal. For details refer to
P.54C-5.
CAUTION (3) Ensure that the negative battery terminal is
The test wiring harness should be used. For disconnected.
details refer to P.54C-5.
Connector: C-119 Harness side: C-119
Harness side
Test harness

C-119 (GR)

Test harness
AC204738HO

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AC501940AI

(1) Disconnect joint connector (CAN1), and measure (4) Resistance between C-119 joint connector
at the wiring harness side. (CAN1) terminal Nos.7 and 18
OK: 1 kΩ or more
CAUTION
Strictly observe the specified wiring harness
repair procedure. For details refer to P.54C-5.
Q: Is the check result normal?
YES : <1 kΩ or more> Go to Step 15.
NO : <Less than 1 kΩ> Go to Step 14.
54C-54 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING

STEP 14. Resistance measurement at A-01 replace the ABS-ECU.

ABS-ECU connector.
CAUTION STEP 15. Resistance measurement at C-119 joint
A digital multimeter should be used. For details connector (CAN1).
refer to P.54C-5. CAUTION
A digital multimeter should be used. For details
Connector: A-01
<2500-SOHC> refer to P.54C-5.
CAUTION
A-01 (B)
The test wiring harness should be used. For
details refer to P.54C-5.
Harness side Connector: C-119
Harness side

AC501610AB

Connector: A-01 C-119 (GR)

<2500-DOHC, 3200>

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A-01 (B)
AC501940AI

Harness side (1) Disconnect the joint connector (CAN1), and

measure at the wiring harness side.
(2) Turn the ignition switch to the LOCK (OFF)
position.
AC501971AC CAUTION
(1) Remove the ABS-ECU, and measure at the When measuring the resistance, disconnect the
equipment side. negative battery terminal. For details refer to
P.54C-5.
(3) Ensure that the negative battery terminal is
disconnected.
Test Test harness
harness Test harness

Harness side: C-119

Equipment side: A-01 AC204738HP

AC204738
Test harness
(2) Resistance at A-01 ABS-ECU connector terminal
Nos.7 and 8
AC204738HQ
OK: 1 kΩ or more
(4) Resistance between C-119 joint connector
Q: Is the check result normal? (CAN1) terminal Nos.2 and 13
YES : <1 kΩ or more> Check intermediate
connector (C-13), and repair if necessary. If OK: 1 kΩ or more
the intermediate connector (C-13) is in good CAUTION
condition, repair the wiring harness between Strictly observe the specified wiring harness
joint connector (CAN1) and the ABS-ECU repair procedure. For details refer to P.54C-5.
connector.
NO : <Less than 1 kΩ> Check the ABS-ECU Q: Is the check result normal?
connector, and repair if necessary. If the
ABS-ECU connector is in good condition,
 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING
54C-55
YES : <1 kΩ or more> Repair the wiring harness
between joint connector (CAN1) and the
intermediate connector (C-35).
NO : <Less than 1 kΩ> Check the diagnosis
connector, and repair if necessary. If the
diagnosis connector is in good condition,
repair the wiring harness between joint
connector (CAN1) and the diagnosis
connector.

Diagnosis Item 4: Diagnose the terminator resistors

CAUTION
When servicing a CAN bus line, earth yourself by touching a metal object such as an unpainted water
pipe. If you fail to do, a component connected to the CAN bus line may be broken.

cardiagn.com
NOTE ENGINE-ECU
2500-SOHC
2500-DOHC,3200

DIAGNOSIS ETACS-ECU
CONNECTOR

Wire colour code

B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Grey R : Red P : Pink V : Violet PU : Purple
54C-56 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING

FUNCTION DIAGNOSIS PROCEDURE

The resistance in the communication errors condition
cannot be measured by the CAN bus diagnostics, STEP 1. Resistance measurement at C-219
therefore, judge the terminator resistor only when ETACS-ECU connector.
receiving the each ECU periodically sent data nor-
mally. CAUTION
A digital multimeter should be used. For details
TROUBLE JUDGEMENT CONDITIONS refer to P.54C-5.
The M.U.T.-III judges the trouble when the periodi- Connector: C-219 Harness side
cally sent data from each ECU can be received nor- Junction block
mally but the resistance value between CAN_H and (Rear view)
CAN_L line is other than from 50 ohms to 70 ohms.
C-219 (GR)
PROBABLE CAUSES
• Damaged harness wires and connectors
• Malfunction of the ETACS-ECU
• Malfunction of the engine-ECU
AC501611AB

cardiagn.com
(1) Remove the ETACS-ECU, and measure at the
equipment side.

Equipment side: C-219

Test
harness

Test
harness
AC204738HL
AC204738

(2) Resistance at C-219 ETACS-ECU connector

terminal Nos.56 and 65
OK: 120 ± 20 Ω
Q: Is the check result normal?
YES : <Within 120 ± 20 Ω> Go to Step 2.
NO : <Not within 120 ± 20 Ω> Replace the
ETACS-ECU.
 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING
54C-57
YES : <Within 120 ± 20 Ω> Repair the wiring
STEP 2. Resistance measurement at C-106
harness between the ETACS-ECU
<2500-SOHC> or C-103 <2500-DOHC, 3200>
connector and the engine-ECU connector.
engine-ECU connector.
NO : <Not within 120 ± 20 Ω> Replace the
CAUTION engine-ECU.
A digital multimeter should be used. For details
refer to P.54C-5.
Connectors: C-103, C-106
C-103
Harness side

C-103 (B)

C-106 C-106
Harness side

AC501943AF

(1) Remove the engine-ECU, and measure at the

equipment side.

cardiagn.com
Equipment side: C-106

Test harness

Test harness
AC204738HF
AC204738

(2) Resistance between C-106 engine-ECU

connector terminal Nos.10 and 23 <2500-SOHC>
OK: 120 ± 20 Ω

Equipment side: C-103

Test
harness

Test
harness
AC204738HG
AC204738

(3) Resistance between C-103 engine-ECU

connector terminal Nos.117 and 125
<2500-DOHC, 3200>
OK: 120 ± 20 Ω
CAUTION
Strictly observe the specified wiring harness
repair procedure. For details refer to P.54C-5.
Q: Is the check result normal?
54C-58 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING

Diagnosis Item 5: Diagnose when the M.U.T.-III cannot receive the data sent by ETACS-ECU.

CAUTION
When servicing a CAN bus line, earth yourself by touching a metal object such as an unpainted water
pipe. If you fail to do, a component connected to the CAN bus line may be broken.

NOTE ENGINE-ECU
2500-SOHC
2500-DOHC,3200

cardiagn.com
DIAGNOSIS ETACS-ECU
CONNECTOR

Wire colour code

B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Grey R : Red P : Pink V : Violet PU : Purple

FUNCTION TROUBLE JUDGEMENT CONDITIONS

The diagnostic result demonstrates that "the M.U.T.-III judges the trouble when the periodically
M.U.T.-III cannot receive the sent data from the sent data from combination meter cannot be
ETACS-ECU" when the M.U.T.-III checks the periodi- received and sent.
cally sent data from each ECU and cannot receive
the ETACS-ECU data only. PROBABLE CAUSES
• Damaged harness wires and connectors
• Power supply circuit malfunction of the
ETACS-ECU
• Malfunction of the ETACS-ECU
 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING
54C-59
DIAGNOSIS PROCEDURE STEP 2. Resistance measurement at C-119 joint
connector (CAN1) and C-219 ETACS-ECU
STEP 1. Connector check: C-119 joint connector connector.
(CAN1) and C-219 ETACS-ECU connector CAUTION
CAUTION A digital multimeter should be used. For details
refer to P.54C-5.
Connector: C-119
Harness side CAUTION
The test wiring harness should be used. For
details refer to P.54C-5.
Connector: C-119
C-119 (GR) Harness side

AC501940AI
C-119 (GR)
Connector: C-219 Harness side
Junction block

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(Rear view)
AC501940AI

C-219 (GR)
Connector: C-219 Harness side
Junction block
(Rear view)

C-219 (GR)
AC501611AB

The strand end of the twist wire should be within

10 cm from the connector. For details refer to
P.54C-5.
AC501611AB

(1) Disconnect the joint connector (CAN1) and the

ETACS-ECU connector, and measure at the
Short pin
wiring harness side.

1 2 3 4 5 6 7 8 9 10 11
12 13 14 15 16 17 18 19 20 21 22
AC209350 AC

When checking the joint connector, ensure that its

wiring harness side and its short pins are not dam-
aged.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the defective connector. Replace the
joint connector as necessary.
54C-60 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING

(2) Turn the ignition switch to the LOCK (OFF)

position.
CAUTION
When measuring the resistance, disconnect the Harness side: C-119
negative battery terminal. For details refer to
P.54C-5.
(3) Ensure that the negative battery terminal is
disconnected.

Test harness

Harness side: C-219

Harness side: C-119 Test

harness

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AC204740GC
Test
harness (5) Continuity between C-119 joint connector (CAN1)
terminal No.14 and C-219 ETACS-ECU
connector terminal No.65
OK: 2 Ω or less
Harness side: C-219 CAUTION
Strictly observe the specified wiring harness
AC204740GB
repair procedure. For details refer to P.54C-5.
(4) Continuity between C-119 joint connector (CAN1) Q: Is the check result normal?
terminal No.3 and C-219 ETACS-ECU connector YES : <All the resistances measure 2 Ω or less>
terminal No.56 Go to Step 3.
NO : <Either or all of the voltages measure more
OK: 2 Ω or less than 2 Ω> Repair the wiring harness
between joint connector (CAN1) and the
ETACS-ECU connector.
 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING
54C-61
STEP 3. Resistance measurement at C-219
ETACS-ECU connector.
CAUTION
A digital multimeter should be used. For details
refer to P.54C-5.
Connector: C-219 Harness side
Junction block
(Rear view)

C-219 (GR)

AC501611AB

(1) Remove the ETACS-ECU, and measure at the

equipment side.

cardiagn.com
Equipment side: C-219

Test
harness

Test
harness
AC204738HL
AC204738

(2) Resistance at C-219 ETACS-ECU connector

terminal Nos.56 and 65
OK: 120 ± 20 Ω
Q: Is the check result normal?
YES : <Within 120 ± 20 Ω> Power supply to the
ETACS-ECU may be suspected. Diagnose
the SWS. Refer to .
NO : <Not within 120 ± 20 Ω> Replace the
ETACS-ECU.
54C-62 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING

Diagnosis Item 6: Diagnose when the M.U.T.-III cannot receive the data sent by CAN adapter.
<Vehicles with RV meter>

CAUTION
When servicing a CAN bus line, earth yourself by touching a metal object such as an unpainted water
pipe. If you fail to do, a component connected to the CAN bus line may be broken.

ENGINE-ECU

cardiagn.com
CAN ADAPTER ETACS-ECU

Wire colour code

B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Grey R : Red P : Pink V : Violet PU : Purple

FUNCTION TROUBLE JUDGEMENT CONDITIONS

The diagnostic result demonstrates that "the M.U.T.-III judges the trouble when the periodically
M.U.T.-III cannot receive the sent data from the CAN sent data from CAN adapter cannot be received and
adapter" when the M.U.T.-III checks the periodically sent.
sent data from each ECU and cannot receive the
CAN adapter data only. PROBABLE CAUSES
• Damaged harness wires and connectors
• Power supply circuit malfunction of the CAN
adapter
• Malfunction of the CAN adapter
 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING
54C-63
DIAGNOSIS PROCEDURE STEP 2. Resistance measurement at C-119 joint
connector (CAN1) and C-110 CAN adapter
STEP 1. Connector check: C-119 joint connector connector.
(CAN1) and C-110 CAN adapter connector CAUTION
CAUTION A digital multimeter should be used. For details
refer to P.54C-5.
Connectors: C-110, C-119
C-110 CAUTION
Harness side
C-110 The test wiring harness should be used. For
details refer to P.54C-5.
C-119
Connectors: C-110, C-119
(GR) C-110
C-119 Harness side
Harness side C-110

C-119
AC501940AJ
(GR)
C-119
The strand end of the twist wire should be within Harness side
10 cm from the connector. For details refer to

cardiagn.com
P.54C-5.
AC501940AJ

(1) Disconnect joint connector (CAN1) and the CAN

adapter connector, and measure at the wiring
Short pin
harness side.

1 2 3 4 5 6 7 8 9 10 11
12 13 14 15 16 17 18 19 20 21 22
AC209350 AC

When checking the joint connector, ensure that its

wiring harness side and its short pins are not dam-
aged.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the defective connector. Replace the
joint connector as necessary.
54C-64 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING

(2) Turn the ignition switch to the LOCK (OFF)

position.
CAUTION
When measuring the resistance, disconnect the Harness side: C-119
negative battery terminal. For details refer to
P.54C-5.
(3) Ensure that the negative battery terminal is
disconnected.

Test
harness Harness side: C-110

Harness side: C-119 Test

harness

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AC204740 GE
Harness side: C-110
(5) Continuity between C-119 joint connector (CAN1)
terminal No.16 and C-110 CAN adapter
connector terminal No.5
Test OK: 2 Ω or less
harness
CAUTION
Strictly observe the specified wiring harness
AC204740GD
repair procedure. For details refer to P.54C-5.
(4) Continuity between C-119 joint connector (CAN1) Q: Is the check result normal?
terminal No.5 and C-110 CAN adapter connector YES : <All the resistances measure 2 Ω or less>
terminal No.6 Power supply to the CAN adapter may be
suspected. Diagnose the RV meter. Refer to
OK: 2 Ω or less
.
NO : <Either or all of the voltages measure more
than 2 Ω> Repair the wiring harness
between joint connector (CAN1) and the
CAN adapter connector.
 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING
54C-65

Diagnosis Item 7: Diagnose when the M.U.T.-III cannot receive the data sent by ABS-ECU. <Vehicles
with ABS>

CAUTION
When servicing a CAN bus line, earth yourself by touching a metal object such as an unpainted water
pipe. If you fail to do, a component connected to the CAN bus line may be broken.

ENGINE-ECU

cardiagn.com
ABS-ECU ETACS-ECU

Wire colour code

B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Grey R : Red P : Pink V : Violet PU : Purple

FUNCTION TROUBLE JUDGEMENT CONDITIONS

The diagnostic result demonstrates that "the M.U.T.-III judges the trouble when the periodically
M.U.T.-III cannot receive the sent data from the sent data from ABS-ECU cannot be received and
ABS-ECU" when the M.U.T.-III checks the periodi- sent.
cally sent data from each ECU and cannot receive
the ABS-ECU data only. PROBABLE CAUSES
• Damaged harness wires and connectors
• Power supply circuit malfunction of the ABS-ECU
• Malfunction of the ABS-ECU
54C-66 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING

DIAGNOSIS PROCEDURE wiring harness side and its short pins are not dam-
aged.
STEP 1. Connector check: C-13 intermediate Q: Is the check result normal?
connector, C-119 joint connector (CAN1) and YES : Go to Step 2.
A-01 ABS-ECU connector NO : Repair the defective connector. Replace the
joint connector as necessary.
CAUTION
Connector: A-01
<2500-SOHC>
STEP 2. Resistance measurement at C-119 joint
connector (CAN1) and C-13 intermediate
A-01 (B) connector.
CAUTION
Harness side
A digital multimeter should be used. For details
refer to P.54C-5.
CAUTION
The test wiring harness should be used. For
AC501610AB details refer to P.54C-5.
Connectors: C-13, C-119
Connector: A-01 C-13

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<2500-DOHC, 3200>

A-01 (B)
C-119
(GR)
Harness side C-119
C-13
Harness side

AC501971AC AC501940AK

(1) Disconnect the joint connector (CAN1) and the

Connectors: C-13, C-119 intermediate connector, and measure at the
C-13
wiring harness side.

C-119
(GR)
C-13 C-119
Harness side

AC501940AK

The strand end of the twist wire should be within

10 cm from the connector. For details refer to
P.54C-5.

Short pin

1 2 3 4 5 6 7 8 9 10 11
12 13 14 15 16 17 18 19 20 21 22
AC209350 AC

When checking the joint connector, ensure that its

 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING
54C-67
(2) Turn the ignition switch to the LOCK (OFF)
position.
CAUTION
When measuring the resistance, disconnect the Harness side: C-119
negative battery terminal. For details refer to
P.54C-5.
(3) Ensure that the negative battery terminal is
disconnected.

Test
harness Female side: C-13

Harness side: C-119 Test

harness

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Female side: C-13 AC204740 GG

(5) Continuity between C-119 joint connector (CAN1)

terminal No.18 and C-13 intermediate connector
terminal No.16
Test OK: 2 Ω or less
harness
CAUTION
Strictly observe the specified wiring harness
AC204740GF
repair procedure. For details refer to P.54C-5.
(4) Continuity between C-119 joint connector (CAN1) Q: Is the check result normal?
terminal No.7 and C-13 intermediate connector YES : <All the resistances measure 2 Ω or less>
terminal No.17 Go to Step 3.
NO : <Either or all of the voltages measure more
OK: 2 Ω or less than 2 Ω> Repair the wiring harness
between joint connector (CAN1) and
intermediate connector (C-13).
54C-68 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING

STEP 3. Resistance measurement at C-13

intermediate connector and A-01 ABS-ECU
connector.
CAUTION
A digital multimeter should be used. For details
refer to P.54C-5.
CAUTION
The test wiring harness should be used. For
details refer to P.54C-5.
Connector: A-01
<2500-SOHC>

A-01 (B)

Harness side

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AC501610AB

Connector: A-01
<2500-DOHC, 3200>

A-01 (B)

Harness side

AC501971AC

Connector: C-13

AC501940 AD

(1) Disconnect the intermediate connector and the

ABS-ECU connector, and measure at the wiring
harness side.
 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING
54C-69
(2) Turn the ignition switch to the LOCK (OFF)
position.
CAUTION
Mail side: C-13
When measuring the resistance, disconnect the
negative battery terminal. For details refer to
P.54C-5.
(3) Ensure that the negative battery terminal is
disconnected.
Test
harness

Mail side: C-13

Test
harness

Test
harness

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Harness side: A-01

AC204740GI
Test
harness (5) Continuity between C-13 intermediate connector
terminal No.17 and A-01 ABS-ECU connector
terminal No.7
OK: 2 Ω or less
CAUTION
Harness side: A-01
Strictly observe the specified wiring harness
AC204740GH
repair procedure. For details refer to P.54C-5.
(4) Continuity between C-13 intermediate connector Q: Is the check result normal?
terminal No.16 and A-01 ABS-ECU connector YES : <All the resistances measure 2 Ω or less>
terminal No.8 Power supply to the ABS-ECU may be
suspected. Diagnose the ABS. Refer to .
OK: 2 Ω or less NO : <Either or all of the voltages measure more
than 2 Ω> Repair the wiring harness
between intermediate connector (C-13) and
the ABS-ECU connector.
54C-70 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING

Diagnosis Item 8: Diagnose the lines between the joint connectors (CAN1 and CAN2)

CAUTION
When servicing a CAN bus line, earth yourself by touching a metal object such as an unpainted water
pipe. If you fail to do, a component connected to the CAN bus line may be broken.

A/T-ECU ENGINE-ECU

NOTE
2500-SOHC
2500-DOHC,3200

cardiagn.com
2WD
4WD

DIAGNOSIS
CONNECTOR CAN ADAPTER

ABS-ECU ETACS-ECU

Wire colour code

B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Grey R : Red P : Pink V : Violet PU : Purple
 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING
54C-71
FUNCTION DIAGNOSIS PROCEDURE
The diagnostic result demonstrates that "diagnose
the lines between the joint connectors (CAN1 and STEP 1. Connector check: C-35 intermediate
CAN2)" when the M.U.T.-III checks the periodically connector, C-119 joint connector (CAN1) and
sent data from each ECU and cannot receive the C-01 joint connector (CAN2)
engine-ECU and the A/T-ECU <A/T> data.
CAUTION
TROUBLE JUDGEMENT CONDITIONS Connectors: C-01, C-35
M.U.T.-III judges the trouble when the periodically C-01 Harness side
sent data from engine-ECU and the A/T-ECU <A/T>
cannot be received and sent.
C-01 (L)
PROBABLE CAUSE C-35
Damaged harness wires and connectors
C-35

AC501943AG

Connector: C-119

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Harness side

C-119 (GR)

AC501940AI

The strand end of the twist wire should be within

10 cm from the connector. For details refer to
P.54C-5.

Short pin

1 2 3 4 5 6 7 8 9 10 11
12 13 14 15 16 17 18 19 20 21 22
AC209350 AC

When checking the joint connector, ensure that its

wiring harness side and its short pins are not dam-
aged.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the defective connector. Replace the
joint connector as necessary.
54C-72 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING

STEP 2. Resistance measurement at C-119 joint

connector (CAN1) and C-35 intermediate
connector.
CAUTION
A digital multimeter should be used. For details
refer to P.54C-5.
CAUTION
The test wiring harness should be used. For
details refer to P.54C-5.
Connector: C-35

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AC501943AE

Connector: C-119
Harness side

C-119 (GR)

AC501940AI

(1) Disconnect the joint connector (CAN1) and the

intermediate connector, and measure at the
wiring harness side.
 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING
54C-73
(2) Turn the ignition switch to the LOCK (OFF)
position.
CAUTION
When measuring the resistance, disconnect the Harness side: C-119
negative battery terminal. For details refer to
P.54C-5.
(3) Ensure that the negative battery terminal is Test harness
disconnected.

Test harness

Test
harness

Harness side: C-119

Female side: C-35

cardiagn.com
AC204740GK
AC204740
Test
harness (5) Continuity between C-119 joint connector (CAN1)
terminal No.12 and C-35 intermediate connector
terminal No.7
OK: 2 Ω or less
Female side: C-35
CAUTION
Strictly observe the specified wiring harness
AC204740GJ
repair procedure. For details refer to P.54C-5.
(4) Continuity between C-119 joint connector (CAN1) Q: Is the check result normal?
terminal No.1 and C-35 intermediate connector YES : <All the resistances measure 2 Ω or less>
terminal No.6 Go to Step 3.
NO : <Either or all of the voltages measure more
OK: 2 Ω or less than 2 Ω> Repair the wiring harness
between joint connector (CAN1) and
intermediate connector (C-35).
54C-74 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING

STEP 3. Resistance measurement at C-01 joint

connector (CAN2) and C-35 intermediate
connector.
CAUTION
A digital multimeter should be used. For details
refer to P.54C-5.
CAUTION
The test wiring harness should be used. For
details refer to P.54C-5.
Connectors: C-01, C-35
C-01 Harness side

C-01 (L)
C-35

C-35

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AC501943AG

(1) Disconnect joint connector (CAN2) and the

intermediate connector, and measure at the
wiring harness side.
 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING
54C-75
(2) Turn the ignition switch to the LOCK (OFF)
position.
CAUTION
When measuring the resistance, disconnect the Harness side: C-01
negative battery terminal. For details refer to
P.54C-5.
(3) Ensure that the negative battery terminal is
disconnected.

Test harness Test harness

Test
harness

Harness side: C-01

Male side: C-35

cardiagn.com
AC204740GM
AC204740
Test
harness (5) Continuity between C-01 joint connector (CAN2)
terminal No.12 and C-35 intermediate connector
terminal No.7
OK: 2 Ω or less
Male side: C-35
CAUTION
Strictly observe the specified wiring harness
AC204740GL
repair procedure. For details refer to P.54C-5.
(4) Continuity between C-01 joint connector (CAN2) Q: Is the check result normal?
terminal No.1 and C-35 intermediate connector YES : <All the resistances measure 2 Ω or less>
terminal No.6 Follow diagnosis item 5 "Diagnose the lines
from the main bus line to the ETACS-ECU,"
OK: 2 Ω or less
diagnosis item 6 "Diagnose the lines
between CAN main bus line and the CAN
adapter <vehicles with RV meter>,"
diagnosis item 7 "Diagnose the lines
between CAN main bus line and the
ABS-ECU <vehicles with ABS>," diagnosis
item 9 "Diagnose the lines from the main
bus line to the A/T-ECU <A/T>" and
diagnosis item 10 "Diagnose the lines from
the main bus line to the engine-ECU." Refer
to P.54C-14.
NO : <Either or all of the voltages measure more
than 2 Ω> Repair the wiring harness
between the intermediate connector and the
intermediate connector.
54C-76 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING

Diagnosis Item 9: Diagnose when the M.U.T.-III cannot receive the data sent by A/T-ECU. <A/T>

CAUTION
When servicing a CAN bus line, earth yourself by touching a metal object such as an unpainted water
pipe. If you fail to do, a component connected to the CAN bus line may be broken.

A/T-ECU ENGINE-ECU

NOTE
2WD
4WD

cardiagn.com
ETACS-ECU

Wire colour code

B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Grey R : Red P : Pink V : Violet PU : Purple

FUNCTION TROUBLE JUDGEMENT CONDITIONS

The diagnostic result demonstrates that "the M.U.T.-III judges the trouble when the periodically
M.U.T.-III cannot receive the sent data from the sent data from A/T-ECU cannot be received and
A/T-ECU" when the M.U.T.-III checks the periodically sent.
sent data from each ECU and cannot receive the
A/T-ECU data only. PROBABLE CAUSES
• Damaged harness wires and connectors
• Power supply circuit malfunction of the A/T-ECU
 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING
54C-77
• Malfunction of the A/T-ECU YES : Go to Step 2.
NO : Repair the defective connector. Replace the
DIAGNOSIS PROCEDURE joint connector as necessary.

STEP 1. Connector check: C-01 joint connector STEP 2. Resistance measurement at C-01 joint
(CAN2) and C-18 <2WD> or C-20 <4WD> A/T-ECU connector (CAN2) and C-18 <2WD> or C-20
connector <4WD> A/T-ECU connector.
CAUTION CAUTION
A digital multimeter should be used. For details
Connector: C-01
refer to P.54C-5.
Harness side
CAUTION
The test wiring harness should be used. For
C-01 (L) details refer to P.54C-5.
Connector: C-01
Harness side

AC501943AD
C-01 (L)

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Connectors: C-18, C-20
C-18
Harness side

C-20 AC501943AD

C-20
Harness side Connectors: C-18, C-20
C-18
Harness side
C-18

C-20
AC501940AG
C-20
The strand end of the twist wire should be within Harness side
10 cm from the connector. For details refer to
C-18
P.54C-5.
AC501940AG

(1) Disconnect joint connector (CAN2) and the

Short pin
A/T-ECU connector, and measure at the wiring
harness side.

1 2 3 4 5 6 7 8 9 10 11
12 13 14 15 16 17 18 19 20 21 22
AC209350 AC

When checking the joint connector, ensure that its

wiring harness side and its short pins are not dam-
aged.
Q: Is the check result normal?
54C-78 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING

(2) Turn the ignition switch to the LOCK (OFF)

position.
CAUTION
When measuring the resistance, disconnect the Harness side: C-01
negative battery terminal. For details refer to
P.54C-5.
(3) Ensure that the negative battery terminal is
disconnected.
Test
harness
Test harness

Test
harness

Harness side: C-01

Harness side: C-18

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Harness side: C-18 AC204740GO
AC204740

(5) Continuity between C-01 joint connector (CAN2)

terminal No.14 and C-18 A/T-ECU connector
terminal No.16 <2WD>
Test OK: 2 Ω or less
harness

Test harness
AC204740GN

(4) Continuity between C-01 joint connector (CAN2)

terminal No.3 and C-18 A/T-ECU connector
terminal No.24 <2WD>
OK: 2 Ω or less
Harness side: C-01

Test
harness

Harness side: C-20

AC204740GP

(6) Continuity between C-01 joint connector (CAN2)

terminal No.3 and C-20 A/T-ECU connector
terminal No.53 <4WD>
OK: 2 Ω or less
 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING
54C-79
YES : <All the resistances measure 2 Ω or less>
Power supply to the A/T-ECU may be
suspected. Diagnose the A/T. Refer to
Harness side: C-01 <2WD> or <4WD>.
NO : <Either or all of the voltages measure more
than 2 Ω> Repair the wiring harness
between joint connector (CAN2) and the
A/T-ECU connector.
Test
harness

Test
harness

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Harness side: C-20

AC204740GQ
AC204740

(7) Continuity between C-01 joint connector (CAN2)

terminal No.14 and C-20 A/T-ECU connector
terminal No.54 <4WD>
OK: 2 Ω or less
CAUTION
Strictly observe the specified wiring harness
repair procedure. For details refer to P.54C-5.
Q: Is the check result normal?
54C-80 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING

Diagnosis Item 10: Diagnose when the M.U.T.-III cannot receive the data sent by engine-ECU.

CAUTION
When servicing a CAN bus line, earth yourself by touching a metal object such as an unpainted water
pipe. If you fail to do, a component connected to the CAN bus line may be broken.

NOTE ENGINE-ECU
2500-SOHC
2500-DOHC,3200

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DIAGNOSIS ETACS-ECU
CONNECTOR

Wire colour code

B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Grey R : Red P : Pink V : Violet PU : Purple
 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING
54C-81
FUNCTION DIAGNOSIS PROCEDURE
The diagnostic result demonstrates that "the
M.U.T.-III cannot receive the sent data from the STEP 1. Connector check: C-01 joint connector
engine-ECU" when the M.U.T.-III checks the periodi- (CAN2) and C-106 engine-ECU connector
cally sent data from each ECU and cannot receive
the engine-ECU data only. CAUTION
Connector: C-01
TROUBLE JUDGEMENT CONDITIONS Harness side
M.U.T.-III judges the trouble when the periodically
sent data from combination meter cannot be
C-01 (L)
received and sent.

PROBABLE CAUSES
• Damaged harness wires and connectors
• Power supply circuit malfunction of the
engine-ECU AC501943AD
• Malfunction of the engine-ECU
Connectors: C-103, C-106
C-103

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Harness side

C-103 (B)

C-106 C-106
Harness side

AC501943AF

The strand end of the twist wire should be within

10 cm from the connector. For details refer to
P.54C-5.

Short pin

1 2 3 4 5 6 7 8 9 10 11
12 13 14 15 16 17 18 19 20 21 22
AC209350 AC

When checking the joint connector, ensure that its

wiring harness side and its short pins are not dam-
aged.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the defective connector. Replace the
joint connector as necessary.
54C-82 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING

STEP 2. Resistance measurement at C-01 joint

connector (CAN2) and C-106 <2500-SOHC> or
C-103 <2500-DOHC, 3200> engine-ECU Test harness
connector.
CAUTION
A digital multimeter should be used. For details
refer to P.54C-5.
CAUTION
Harness side: C-01
The test wiring harness should be used. For
details refer to P.54C-5.
Connector: C-01
Harness side Test
harness
C-01 (L)

Harness side: C-106

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AC501943AD
AC204740GR

Connectors: C-103, C-106 (4) Continuity between C-01 joint connector (CAN2)
C-103 terminal No.2 and C-106 engine-ECU connector
Harness side
terminal No.10 <2500-SOHC>
C-103 (B)
OK: 2 Ω or less

C-106 C-106
Harness side
Harness side: C-01

AC501943AF

(1) Disconnect the joint connector (CAN2) and the

engine-ECU connector, and measure at the
wiring harness side.
(2) Turn the ignition switch to the LOCK (OFF)
position.
CAUTION
When measuring the resistance, disconnect the
Harness side: C-106
negative battery terminal. For details refer to
P.54C-5.
(3) Ensure that the negative battery terminal is
disconnected.
Test
harness

AC204740 GS

(5) Continuity between C-01 joint connector (CAN2)

terminal No.13 and C-106 engine-ECU connector
terminal No.23 <2500-SOHC>
OK: 2 Ω or less
 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING
54C-83
CAUTION
Strictly observe the specified wiring harness
Test harness
repair procedure. For details refer to P.54C-5.
Q: Is the check result normal?
YES : <All the resistances measure 2 Ω or less>
Go to Step 3.
NO : <Either or all of the voltages measure more
than 2 Ω> Repair the wiring harness
Harness side: C-01 between joint connector (CAN2) and the
engine-ECU connector.

Test
harness

Harness side: C-103

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AC204740GT

(6) Continuity between C-01 joint connector (CAN2)

terminal No.2 and C-103 engine-ECU connector
terminal No.117 <2500-DOHC, 3200>
OK: 2 Ω or less

Harness side: C-01

Harness side: C-103

Test
harness

AC204740 GU

(7) Continuity between C-01 joint connector (CAN2)

terminal No.13 and C-103 engine-ECU connector
terminal No.125 <2500-DOHC, 3200>
OK: 2 Ω or less
54C-84 CONTROLLER AREA NETWORK (CAN)
TROUBLESHOOTING

YES : <Within 120 ± 20 Ω> Power supply to the

STEP 3. Resistance measurement at C-106
engine-ECU may be suspected. Diagnose
<2500-SOHC> or C-103 <2500-DOHC, 3200>
the fuel system. Refer to <2500-SOHC>,
engine-ECU connector.
<2500-DOHC> or <3200>.
CAUTION NO : <Not within 120 ± 20 Ω> Replace the
A digital multimeter should be used. For details engine-ECU.
refer to P.54C-5.
Connectors: C-103, C-106
C-103
Harness side

C-103 (B)

C-106 C-106
Harness side

AC501943AF

(1) Remove the engine-ECU, and measure at the

equipment side.

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Equipment side: C-106

Test harness

Test harness
AC204738HF
AC204738

(2) Resistance between C-106 engine-ECU

connector terminal Nos.10 and 23 <2500-SOHC>
OK: 120 ± 20 Ω

Equipment side: C-103

Test
harness

Test
harness
AC204738HG
AC204738

(3) Resistance between C-103 engine-ECU

connector terminal Nos.117 and 125
<2500-DOHC, 3200>
OK: 120 ± 20 Ω
CAUTION
Strictly observe the specified wiring harness
repair procedure. For details refer to P.54C-5.
Q: Is the check result normal?
 CONTROLLER AREA NETWORK (CAN)
CAN COMMUNICATION SIGNAL TABLE
54C-85
CAN COMMUNICATION SIGNAL TABLE
M1548300400231

Signal Transmitter Receiver ECU

ECU
Engine-ECU Engine-ECU A/T-ECU RV meter ETACS-ECU
*1 *2

Transmission torque request signal Engine-E − − × − −

CU
Engine torque signal − − × − −
Vehicle speed signal − − − × ×
Vehicle speed sensor fail signal − − − × ×
Starter motor signal − − − − ×
Torque converter lock up clutch request signal − − × − −
Shift pattern request signal − − × − −
Engine coolant temperature signal − − × − −
Fuel consumption signal − − − × −
A/C clutch signal − − × − −

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Engine torque request signal A/T-ECU − × − − −
Target gear signal − − − − ×
A/T fluid temperature signal − × − − −
Operating buzzer request signal RV meter − − − − ×
Keep communication on request signal − − − − ×
Function customize signal − − − − ×
Ignition switch (ACC) signal ETACS-E − − − × −
Ignition switch (IG1) signal CU
− − − × −
Illumination request signal − − − × −
Fog light indicator lamp illuminate signal − × − − −
Turn-signal indicator lamp illuminate signal − × − − −
High-beam indicator lamp illuminate signal − × − − −
Wiper status signal − × − − −
Headlamp illuminate signal − × − − −
Position lamp illuminate signal − × − − −
Diagnosis code setting enabled signal × × × × −
Free run counter signal × × × − −
NOTE: .
• "× " indicates the applicable points.
*1
• : Vehicles without Common Rail System
• *2: Vehicles with Common Rail System
54C-86 CONTROLLER AREA NETWORK (CAN)
CAN COMMUNICATION-RELATED DIAGNOSIS CODE (U CODE) TABLE

CAN COMMUNICATION-RELATED DIAGNOSIS CODE

(U CODE) TABLE
M1548300300278

Code Diagnostic item Output ECU Action

No.
U1073 Bus Off Engine-ECU, A/T-ECU, ABS-ECU, CAN main bus line
ETACS-ECU diagnostics
U1100 Engine-ECU time-out (related to A/T-ECU, ETACS-ECU
engine)
U1101 A/T-ECU time-out (related to Engine-ECU, A/T-ECU
automatic transmission) <A/T>
U1109 ETACS-ECU time-out Engine-ECU, A/T-ECU
U1111 RV meter time-out ETACS-ECU
U1120 Failure information of Engine-ECU A/T-ECU Diagnose CAN main
U1150 Failure information of vehicles speed ETACS-ECU bus lines and
confirm input signals.

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U1190 The network system diagnosis code Engine-ECU, A/T-ECU
output permitted signal can not be
received.