ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM EI–1

ENGINE IMMOBILISER SYSTEM

PRECAUTION
1. NOTICE FOR INITIALIZATION
(a) When disconnecting the negative (-) battery
terminal, initialize the following systems after the
terminal is reconnected.
System Name See procedure
EI
SFI System (See page IN-43)

2. PRECAUTIONS WHEN USING INTELLIGENT TESTER

(a) When using the intelligent tester to troubleshoot the
smart key system: Connect the intelligent tester to
the DLC3 while the power switch is off, and turn a
door courtesy light switch on and off at 1.5-second
intervals until communication between the tester
and vehicle begins.
3. PRECAUTIONS FOR EACH FUNCTION
(a) Precautions for the electrical key:
The electrical key is a precision instrument. Be sure
to observe the following:
(1) Do not drop or strike the electrical key.
(2) Do not allow the electrical key to be kept in a
high temperature place for a long time.
(3) Do not use an ultrasonic washing machine to
clean the electrical key.
(4) Keep the electrical key away from magnets or
magnetized items during use.
(5) Do not attach any stickers to the electrical key.
(b) Precautions for the hybrid vehicle control system
start function:
(1) Before starting the hybrid vehicle control system,
firmly depress the brake pedal until the indicator
of the power switch illuminates in green.
(2) Be sure to turn the power switch off before
disconnecting the negative (-) battery terminal.
When the battery terminal is disconnected, the
power source mode (off, on (ACC), on (IG)) will
remain in memory. When the vehicle's battery
becomes discharged, be careful to remember
the power source mode.
(3) After the battery is removed and reinstalled, be
sure to wait 10 seconds or more before the next
engine start. The hybrid vehicle control system
may not start immediately after the battery is
reinstalled.
 EI–2 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM

(c) Precautions for the battery built into the electrical

key and the vehicle battery:
(1) When the doors are locked (locked state),
signals are emitted by the vehicle at a
predetermined interval. If the vehicle were to
remain parked for a long time, the vehicle
battery could become discharged. To prevent
this, periodically charge the vehicle battery, or
EI disable the smart key system.
(2) When the doors are locked (locked state), and
the electrical key remains in the door oscillator
detection area, the system will maintain periodic
communication with the electrical key. If the
vehicle remains parked in this state for a long
time, the vehicle and key batteries could
become discharged. If the vehicle is not being
used, keep the electrical key at least 2 m (6.56
ft) away from the vehicle.
 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM EI–3

PARTS LOCATION

HYBRID VEHICLE CONTROL ECU

EI

SECURITY INDICATOR LIGHT:

CLOCK

ID CODE BOX

CERTIFICATION ECU

DLC3 STEERING LOCK ECU POWER SWITCH

MAIN BODY ECU (INSTRUMENT PANEL J/B)

B150821E01
 EI–4 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM

SYSTEM DIAGRAM

Power Switch

- Transponder Key
EI Amplifier (with Key Coil)
Certification ECU

Main Body ECU

(Instrument Panel J/B) ID Code Box Steering Lock ECU

Hybrid Vehicle
Control ECU

LIN Communication Line

B128344E06

Communication table:
Transmitting ECU (Transmitter) Receiving ECU (Receiver) Signals Communication method
Main body ECU (Instrument panel
Certification ECU Key code recognition signal LIN
J/B)
ID code box Certification ECU DTC (B2791) signal LIN
• Steering lock release signal
ID code box Steering lock ECU • Matching request random LIN
number signal
Matching request random number
ID code box Certification ECU LIN
signal
 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM EI–5

SYSTEM DESCRIPTION
1. ENGINE IMMOBILISER SYSTEM DESCRIPTION
(a) The immobiliser system is a theft deterrent system
that determines whether to disable starting of the
hybrid control system based on a comparison of the
key's ID codes and the vehicle's pre-registered
code. The immobiliser system compares the vehicle
certification ECU's pre-registered ID code with the EI
ID of the key-embedded transponder chip. If the ID
codes do not match, the immobiliser system
activates and the hybrid control system cannot be
started. The certification ECU manages
communication with the ECM, main body ECU
(instrument panel J/B), steering lock ECU and ID
code box. When the ID codes of the transponder
chip and certification ECU match, the certification
ECU authorizes the hybrid control system to start.
2. FUNCTION OF MAIN COMPONENT
Component Outline
Receives key ID code, amplifies ID code and outputs the code to the
Transponder key coil/amplifier (built into power switch)
certification ECU.
Transmits key detection signals within the detection area in the vehicle
interior upon receiving a transmission request signal from the
Indoor electrical key oscillator certification ECU.
Certification ECU request signal is activated when the key is brought
into the vehicle interior and the power switch is pushed.
Receives an ID code from the key in the actuation area and transmits
Door control receiver
it to the certification ECU.
Illuminates or starts flashing.
Security indicator
Illumination is controlled by the certification ECU.

3. SYSTEM FUNCTION
(a) Using entry function
(1) When the driver (or passenger) is sitting in the
vehicle while carrying the key, and the power
switch is pressed while the brake pedal is
depressed, the main body ECU (instrument
panel J/B) recognizes that the engine start
operation has occurred and sends a certification
request signal to the certification ECU. Upon
receipt of the certification request signal, the
certification ECU sends a request signal to the
indoor electrical key oscillator. Upon receipt of
the request signal, the indoor electrical key
oscillator sends a request signal to detect if the
key is inside the vehicle. When the key receives
this request signal, it answers by sending an ID
code containing a response code through the
glass antenna to the door control receiver. Upon
receipt of the ID code, the certification ECU
analyzes the code. If the interior certification
passes, then the main body ECU (instrument
panel J/B) sends a certification pass response
signal. When the main body ECU (instrument
panel J/B) receives this signal, the ACC relay is
 EI–6 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM

switched on and the IG1 and IG2 relays are

switched on in sequence. At this time, the power
switch indicator illuminates in green. Then the
certification ECU checks that the power source
mode has been changed and sends a steering
lock command signal to the main body ECU
(instrument panel J/B). After receiving this
signal, the main body ECU (instrument panel J/
EI B) supplies power to the steering lock actuator.
Then (via the ID code box) the steering lock
ECU confirms that the certification ECU is
certified and drives the steering actuator motor
until the steering lock is unlocked. After
unlocking the steering lock, an unlock completed
signal is sent to the certification ECU. Upon
receipt of this signal, the certification ECU sends
an unset command signal to the ID code box.
Once this signal is received, the ID code box
confirms that the certification ECU is certified,
sends an immobiliser unset command signal to
the ECM and sends a security indicator light off
signal to the certification ECU.
(b) Not using the entry function (when key battery is
depleted)
(1) When the driver is sitting in the vehicle while
carrying the key and the brake pedal is
depressed, the main body ECU (instrument
panel J/B) recognizes that the stop light switch is
on and sends a key confirmation request signal
to the certification ECU. Upon receipt of this
signal, the certification ECU drives the
immobiliser amplifier built in the power switch. At
this time, the power switch sends an RF wave
communication signal to the immobiliser. If the
driver holds the key up to the power switch at
this time, the power switch receives the
immobiliser RF wave signal and responds by
sending a radio wave signal. When the power
switch receives the radio wave signal from the
key, it duplicates the signal and sends an ID
code to the certification ECU. Upon receipt of
the ID code, the code is analyzed. If the
certification passes, a key certification pass
response signal is sent to the main body ECU
(instrument panel J/B) while simultaneously
sending a sound buzzer request signal to the
meter ECU. When the main body ECU
(instrument panel J/B) receives this signal, the
ACC relay is switched on and the IG1 and IG2
relays are switched on in sequence. At this time,
the power switch indicator illuminates in green.
Then the certification ECU checks that the
power source mode has been changed and
sends a steering lock command signal to the
ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM EI–7

main body ECU (instrument panel J/B). After

receiving this signal, the main body ECU
(instrument panel J/B) supplies power to the
steering lock actuator. Then (via the ID code
box) the steering lock ECU confirms that the
certification ECU is certified and drives the
steering actuator motor until the steering lock is
unlocked. After unlocking the steering lock, an
unlock completed signal is sent to the EI
certification ECU. Upon receipt of this signal, the
certification ECU sends an unset command
signal to the ID code box. Once this signal is
received, the ID code box confirms that the
certification ECU is certified, sends an
immobiliser unset command signal to the hybrid
control system and sends a security indicator
light off signal to the certification ECU.
 EI–8 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM

HOW TO PROCEED WITH

TROUBLESHOOTING
HINT:
• Use the following procedures to troubleshoot the engine
immobiliser system.
• The intelligent tester should be used in steps 3, 4 and 6.

EI
1 VEHICLE BROUGHT TO WORKSHOP

NEXT

2 INSPECT BATTERY VOLTAGE

(a) Inspect the battery voltage.

Standard voltage:
11 to 14 V
If the voltage is below 11 V, recharge or replace the
battery before proceeding to the next step.
NEXT

3 INSPECT COMMUNICATION FUNCTION OF MULTIPLEX COMMUNICATION SYSTEM

(CAN)

(a) Using the intelligent tester, check if the CAN

communication system is functioning normally.
Result
Result Proceed to
CAN DTC is not output A
B
CAN DTC is output
(See page CA-7)

B GO TO CAN COMMUNICATION SYSTEM

4 CHECK FOR DTCS

(a) Check for DTCs and note any codes that are output (see
page EI-25).
(b) Delete the DTCs.
(c) Recheck for DTCs. Based on the DTCs output above, try
to duplicate the hybrid control system DTC or engine
immobiliser system DTC by simulating the symptoms
indicated by the DTCs.
Result
Result Proceed to
DTC output does not reoccur A
B
Hybrid control system DTC output reoccurs
(See page HV-46)
 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM EI–9

Result Proceed to
C
Engine immobiliser system DTC output reoccurs
(See page EI-27)

B GO TO HYBRID CONTROL SYSTEM

C GO TO DTC CHART

A EI
5 PROBLEM SYMPTOMS TABLE

(a) If the fault is not listed in the problem symptoms table,

proceed to A.
(b) If the fault is listed in the problem symptoms table,
proceed to B.
B GO TO STEP 7

6 OVERALL ANALYSIS AND TROUBLESHOOTING

(a) DATA LIST/ACTIVE TEST (See page EI-25)

(b) TERMINALS OF ECU (See page EI-16)
NEXT

7 ADJUST, REPAIR OR REPLACE

NEXT

8 CONFIRMATION TEST

NEXT

END
 EI–10 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM

REGISTRATION
1. DESCRIPTION OF CODE REGISTRATION
HINT:
• ID codes are the same as recognition codes for the
wireless transmitter and the engine immobiliser
function. Registering an ID code enables the smart
key system, the wireless door lock control function
EI and the engine immobiliser function to be operated.
• Code registration is needed when the certification
ECU, ID code box, steering lock ECU or key is
replaced with a new one.
(a) PROCEDURE "1"
The vehicle with the smart key system does not
have a key slot. Therefore, hold the key close to the
power switch to register the key, as shown in the
illustration below.

Hold the key with its ornament surface within a range of 10 mm (0.39 in.) or less from the power switch.

Communication distance: 10 mm (0.39 in.) or less from the power switch.

Power Switch Key Key

TOYOTA Mark (Ornament Surface) TOYOTA Mark (Ornament Surface)

B139204E02
 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM EI–11

2. PART REPLACEMENT KEY REGISTRATION

(a) The following table shows ECU replacement and
key registration procedures in case the
malfunctioning ECU has been identified after
troubleshooting the smart key system.
HINT:
• The following procedures indicated in the table
below require the use of the intelligent tester:
New key ID registration EI
Additional key ID registration
Key ID erasure
ECU code registration
• If all of the registered keys are not available,
replacement of the ID code box is also required.
• A maximum of 7 keys can be registered.
Part to be replaced Condition Procedure Reference
1. Replace certification ECU -
Customer has brought all keys 2. Reregister all keys (new key ID
PROCEDURE "B"
registration)
1. Erase key codes (key ID erasure) PROCEDURE "D"
2. Perform additional key registration
PROCEDURE "C"
procedure (additional key ID registration)
3. Replace certification ECU -
Key ID codes can be
registered and erased 4. Reregister all keys (new key ID
registration)
HINT:
PROCEDURE "B"
If some keys are not registered during above
steps, they will be disabled because they
Certification ECU cannot be registered later.
1. Replace certification ECU -
Some keys are lost
2. Replace ID code box -
3. Reregister all keys (new key ID
registration)
HINT:
Key ID codes cannot If key codes cannot be erased or additional
be either registered or keys cannot be registered due to a
erased PROCEDURE "A"
malfunction in certification ECU, replace ID
code box and certification ECU. If some keys
are not registered during above steps, they
will be disabled because they cannot be
registered later.
4. ECU communication ID registration PROCEDURE "F"
1. Replace ID code box -
2. Register recognition codes in ECUs (ECU
At least 1 key is available PROCEDURE "E"
code registration)
3. ECU communication ID registration PROCEDURE "F"
1. Replace ID code box -
2. Replace certification ECU -
ID code box
3. Reregister all keys (new key ID
registration)
All keys are lost HINT:
PROCEDURE "A"
If some keys are not registered during above
steps, they will be disabled because they
cannot be registered later.
4. ECU communication ID registration PROCEDURE "F"
 EI–12 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM

Part to be replaced Condition Procedure Reference

1. Replace steering lock ECU -
Customer has brought at least 1 key 2. Register recognition codes in ECUs (ECU
PROCEDURE "E"
code registration)
1. Replace steering lock ECU -
2. Replace certification ECU -
3. Replace ID code box -
Steering lock ECU
EI All keys are lost
4. Reregister all keys (new key ID
registration)
HINT:
PROCEDURE "A"
If some keys are not registered during above
steps, they will be disabled because they
cannot be registered later.
5. ECU communication ID registration PROCEDURE "F"
Main body ECU
Replace main body ECU (Instrument panel J/
(Instrument panel J/ No condition required -
B)
B)

Hybrid vehicle control 1. Replace hybrid vehicle control ECU -

No condition required
ECU 2. ECU communication ID registration PROCEDURE "F"
1. Using remaining key, erase lost key code
PROCEDURE "D"
(key ID erasure)
Customer has brought at least 1 key
2. Register additional keys as necessary
PROCEDURE "E"
(additional key ID registration)
1. Replace certification ECU -

Key 2. Replace ID code box -

3. Register all keys (new key ID registration)
All keys are lost HINT:
If customer brings lost keys at later date, they PROCEDURE "A"
can be registered using additional key ID
registration function.
4. ECU communication ID registration PROCEDURE "F"

3. KEY REGISTRATION
(a) PROCEDURE "A"
New key ID registration (when replacing certification
ECU and ID code box, or certification ECU, ID code
box and steering lock ECU)
Process Procedure
1. Start of registration 1. Connect intelligent tester (with CAN VIM) to DLC3
2. Turn power switch on (IG)
3. Select "SMART KEY / ID UTILITY / SMART CODE REG" from
tester menu
HINT:
The power switch cannot be turned on (IG) more than 10 times. After
connecting tester, turn tester on while turning driver's side door
courtesy light switch on and off repeatedly at 1.5-second intervals or
less to continue key registration procedure.
2. Confirmation of ECU code Perform operation according to prompts on tester screen
HINT:
The mode is automatically selected by tester, new registration mode
or add mode.
3. Verification of unregistered key *1 Hold unregistered key close to power switch (For details, refer to
PROCEDURE "1")
Confirm that wireless door lock buzzer sounds. Place unregistered
key on front passenger's side seat.
Confirm that wireless door lock buzzer sounds
4. Registration of ID code Perform operation according to prompts on tester screen
5. End of registration Finish new key ID code registration
 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM EI–13

*1: Repeat this process for each key which is to be

registered for the vehicle. Finish the procedure for
each key within 30 seconds. If the procedure for any
of the keys has not been finished within the
specified time, perform registration procedures from
process 1 again. Make sure that only 1 key is in the
cabin during registration procedures. If 2 or more
keys are in the cabin simultaneously, electric waves
will interfere with each other, preventing normal EI
registration.
(b) PROCEDURE "B"
New key ID registration (when replacing certification
ECU)
Process Procedure
1. Start of registration 1. Connect intelligent tester (with CAN VIM) to DLC3
2. Turn power switch on (IG)
3. Select "SMART KEY / ID UTILITY / SMART CODE REG" from
tester menu
HINT:
The power switch cannot be turned on (IG) more than 10 times. After
connecting tester, turn tester on while turning driver's side door
courtesy light switch on and off repeatedly at 1.5-second intervals or
less to continue key registration procedure.
2. Confirmation of ECU code Perform operation according to prompts on tester screen
HINT:
The mode is automatically selected by tester, new registration mode
or add mode.
3. Confirmation of all registered keys *1 Hold unregistered key close to power switch (For details, refer to
PROCEDURE "1")
Confirm that wireless door lock buzzer sounds
4. Confirmation of ECU code Perform operation according to prompts on tester screen
5. Verification of unregistered key *2 Hold unregistered key close to power switch (For details, refer to
PROCEDURE "1")
Confirm that wireless door lock buzzer sounds. Place unregistered
key on front passenger side seat.
Confirm that wireless door lock buzzer sounds
5. Registration of ID code Perform operation according to prompts on tester screen
6. End of registration Finish new key ID code registration

*1: Repeat this process for each key registered for

the vehicle. Finish the procedure for each key within
30 seconds. If the procedure for any of the keys has
not been finished within the specified time, perform
registration procedures from process 1 again. If
performing the key confirmation procedure for a key,
the security indicator comes on and remains on until
all the keys are confirmed.
*2: Repeat this process for each key which is to be
registered for the vehicle. Finish the procedure for
each key within 30 seconds. If the procedure for any
of the keys has not been finished within the
specified time, perform registration procedures from
1 again. Make sure that only 1 key is in the cabin
during registration procedures. If 2 or more keys are
in the cabin simultaneously, electric waves will
interfere with each other, preventing normal
registration.
 EI–14 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM

(c) PROCEDURE "C"

Additional key ID registration
Process Procedure
1. Start of registration 1. Connect intelligent tester (with CAN VIM) to DLC3
2. Turn power switch on (IG)
3. Select "SMART KEY / ID UTILITY / SMART CODE REG" from
tester menu
2. Confirmation of registered key *1 Perform operation according to prompts on intelligent tester screen
EI HINT:
The mode is automatically selected by tester, new registration mode
or add mode.
Hold unregistered key close to power switch (For details, refer to
PROCEDURE "1")
Confirm that wireless door lock buzzer sounds once
3. Confirmation of ECU code Perform operation according to prompts on tester screen
4. Verification of unregistered key *2 Hold unregistered key close to power switch (For details, refer to
PROCEDURE "1")
Confirm that wireless door lock buzzer sounds. Place unregistered
key on front passenger's side seat.
Confirm that wireless door lock buzzer sounds
5. Registration of ID code Perform operation according to prompts on tester screen
6. End of registration Finish key ID code registration

*1: Perform this process for one of the keys

registered for the vehicle. Finish the procedure
within 30 seconds. If the procedure has not been
finished within the specified time, perform
registration procedures from process 1 again.
*2: Repeat this process for each key which is to be
registered for the vehicle. Finish the procedure for
each key within 30 seconds. If the procedure for any
of the keys has not been finished within the
specified time, perform registration procedures from
1 again. Make sure that only 1 key is in the cabin
during registration procedures. If 2 or more keys are
in the cabin simultaneously, electric waves will
interfere with each other, preventing normal
registration.
(d) PROCEDURE "D"
Key ID erasure
HINT:
Erase all registered key codes except one.
Process Procedure
1. Start of erasure 1. Connect intelligent tester (with CAN VIM) to DLC3
2. Turn power switch on (IG)
3. Select "SMART KEY / ID UTILITY / SMART CODE ERS" from
tester menu
2. Confirmation of registered key *1 Perform operation according to prompts on intelligent tester screen
Hold unregistered key close to power switch (For details, refer to
PROCEDURE "1")
Confirm that wireless door lock buzzer sounds once
3. Confirmation of ECU code Perform operation according to prompts on tester screen
4. Erasure of ID code Perform operation according to prompts on tester screen
5. End of erasure Finish key ID code erasure
 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM EI–15

*1: Perform this process for one of the keys

registered for the vehicle. Finish the procedure
within 30 seconds. If the procedure has not been
finished within the specified time, perform erasure
procedures from process 1 again.
(e) PROCEDURE "E"
ECU code registration

1. Start of registration
Process Procedure
1. Connect intelligent tester (with CAN VIM) to DLC3
EI
2. Turn power switch on (IG)
3. Select "SMART KEY / ID UTILITY / ECU COMM ID REG / ID
Code Box and Steering Lock" from tester menu
2. Confirmation of registered key *1 Hold unregistered key close to power switch (For details, refer to
PROCEDURE "1")
Confirm that wireless door lock buzzer sounds once
3. Registration of ECU code Perform operation according to prompts on tester screen
4. End of registration Finish ECU code registration

*1: Perform this process for one of the keys

registered for the vehicle. Finish the procedure
within 30 seconds. If the procedure has not been
finished within the specified time, perform erasure
procedures from process 1 again.
(f) PROCEDURE "F"
ECU communication ID registration
NOTICE:
• The ECU communication ID should be
registered when the ID code box and/or the
hybrid vehicle control ECU is replaced in
order to match these ECU communication ID.
• The engine cannot be started unless the ECU
communication ID matches.
• After the registration, pressing the power
switch may not start the hybrid control
system on the first try. If so, press the power
switch again.
• After the hybrid control system is started,
erase DTC B2799-542, 790 (code for hybrid
vehicle control ECU's immobiliser
communication error).
Register the ECU communication ID.
 EI–16 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM

CG

EI

TC

SST
B139171E01

(1) Using SST, connect terminals TC and CG of

the DLC3.
SST 09843-18040
(2) Turn the power switch on (IG) and leave it for
30 minutes.
HINT:
Do not start the engine.
(3) Turn the power switch off and disconnect
terminals TC and CG.
(4) Check that the hybrid control system.
OK:
Hybrid control system starts and stays on
for more than 3 seconds.
HINT:
Using an already registered key, turn the power
switch on (IG) with the brake pedal depressed.
 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM EI–17

PROBLEM SYMPTOMS TABLE

HINT:
Use the table below to help determine the cause of the
problem symptom. The potential causes of the symptoms are
listed in order of probability in the "Suspected Area" column
of the table. Check each symptom by checking the suspected
area in the order they are listed. Replace parts as necessary.
ENGINE IMMOBILISER SYSTEM:
Symptom Suspected Area See page
EI
1. Key EI-25
2. ID code box power source circuit EI-50
3. Certification ECU power source circuit EI-52
Engine does not start
4. Steering lock ECU power source circuit SR-30
5. Smart key system ST-10
6. Hybrid control system HV-15
 EI–18 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM

TERMINALS OF ECU
1. CHECK POWER SWITCH

E52

EI       
      

B146454E01

(a) Disconnect the E52 switch connector.

(b) Measure the resistance according to the value(s) in
the table below.
Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
AGND (E52-8) - Body ground G - Body ground Ground Always Below 1 Ω

If the result is not as specified, there may be a

malfunction on the wire harness side.
(c) Reconnect the E52 switch connector.
(d) Measure the resistance and voltage according to
the value(s) in the table below.
Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
AGND (E52-8) - Body ground G - Body ground Ground Always Below 1 Ω
Key is not in cabin Below 1 V
VC5 (E52-14) - AGND (E52-8) R-G Power supply
Press power switch 4.6 to 5.4 V
Key is not in cabin Below 1 V
Demodulated signal of key Press power switch and
CODE (E52-10) - AGND (E52-8) W-G Pulse generation
code data hold key close to power
(see waveform 1)
switch*
Key is not in cabin Below 1 V

TXCT (E52-9) - AGND (E52-8) GR - G Key code output signal Press power switch and
Pulse generation
hold key close to power
(see waveform 2)
switch*

HINT:
*: Remove the key battery before performing this
inspection.
If the result is not as specified, the switch may have
a malfunction.
 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM EI–19

(e) Inspect using an oscilloscope.

(1) Waveform 1 (Reference)

Item Content
Symbols (Terminal No.) CODE (E52-10) - AGND (E52-8)
Tool Setting 2 V/DIV., 20 ms./DIV.
GND Press power switch and hold key close
Condition
to power switch*

HINT:
EI
*: Remove the key battery before performing this
inspection.

Tool Setting: 2 V/DIV., 20 ms./DIV.

B139211E01

(2) Waveform 2 (Reference)

Item Content
Symbols (Terminal No.) TXCT (E52-9) - AGND (E52-8)
Tool Setting 2 V/DIV., 20 ms./DIV.
Press power switch and hold key close
Condition
GND to power switch*

HINT:
*: Remove the key battery before performing this
inspection.
2. CHECK CERTIFICATION ECU

Tool Setting: 2 V/DIV., 20 ms./DIV.

B139212E01

E58

B075721E28

(a) Disconnect the E58 ECU connector.

(b) Measure the resistance and voltage according to
the value(s) in the table below.
Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
E (E58-17) - Body ground W-B - Body ground Ground Always Below 1 Ω
+B (E58-1) - E (E58-17) W - W-B +B power supply Always 10 to 14 V
IG (E58-18) - E (E58-17) LG - W-B Ignition power supply Power switch off Below 1 V

If the result is not as specified, there may be a

malfunction on the wire harness side.
(c) Reconnect the E58 ECU connector.
 EI–20 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM

(d) Measure the resistance and voltage according to

the value(s) in the table below.
Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
AGND (E58-40) - Body ground G - Body ground Power switch ground Always Below 1 Ω
Power switch power Key is not in cabin Below 1 V
VC5 (E58-30) - AGND (E58-40) R-G
supply Press power switch* 4.6 to 5.4 V
Key is not in cabin Below 1 V

EI CODE (E58-9) - AGND (E58-40) W-G Power switch CODE input Press power switch and
hold key close to power
Pulse generation (see
waveform 1)
switch*
Key is not in cabin Below 1 V

TXCT (E58-8) - AGND (E58-40) GR - G Power switch TXCT output Press power switch and
Pulse generation (see
hold key close to power
waveform 2)
switch*

HINT:
*: Remove the key battery before performing this
inspection.
If the result is not as specified, the ECU may have a
malfunction.
(e) Inspect using an oscilloscope.
(1) Waveform 1 (Reference)

Item Content
Symbols (Terminal No.) CODE (E58-9) - AGND (E58-40)
Tool Setting 2 V/DIV., 20 ms./DIV.
GND Press power switch and hold key close
Condition
to power switch*

HINT:
*: Remove the key battery before performing this
inspection.

Tool Setting: 2 V/DIV., 20 ms./DIV.

B139211E01

(2) Waveform 2 (Reference)

Item Content
Symbols (Terminal No.) TXCT (E58-8) - AGND (E58-40)
Tool Setting 2 V/DIV., 20 ms./DIV.
Press power switch and hold key close
Condition
GND to power switch*

HINT:
*: Remove the key battery before performing this
inspection.

Tool Setting: 2 V/DIV., 20 ms./DIV.

B139212E01
 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM EI–21

3. CHECK ID CODE BOX

E50

EI
B118534E03

(a) Disconnect the E50 ECU connector.

(b) Measure the resistance and voltage according to
the value(s) in the table below.
Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
GND (E50-8) - Body ground W-B - Body ground Ground Always Below 1 Ω
+B (E50-1) - GND (E50-8) W - W-B +B power supply Always 10 to 14 V

If the result is not as specified, there may be a

malfunction on the wire harness side.
(c) Reconnect the E50 ECU connector.
(d) Measure the voltage according to the value(s) in the
table below.
Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
Power switch off Below 1 V
Hybrid vehicle control
EFII (E50-5) - GND (E50-8) G - W-B Pulse generation
ECU input signal Power switch on (IG)
(see waveform 1)
Power switch off Below 1 V
Hybrid vehicle control
EFIO (E50-6) - GND (E50-8) L - W-B Pulse generation
ECU output signal Power switch on (IG)
(see waveform 2)

If the result is not as specified, the ECU may have a

malfunction.
(e) Inspect using an oscilloscope.
(1) Waveform 1 (Reference)

Item Content
Symbols (Terminal No.) EFII (E50-5) - GND (E50-8)
GND Tool Setting 10 V/DIV., 100 ms./DIV.
Condition Power switch on (IG)

Tool Setting: 10 V/DIV., 100 ms./DIV.

B139209E01
 EI–22 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM

(2) Waveform 2 (Reference)

Item Content
Symbols (Terminal No.) EFIO (E50-6) - GND (E50-8)
Tool Setting 10 V/DIV., 100 ms./DIV.
GND Condition Power switch on (IG)

4. CHECK STEERING CONTROL ECU

EI

Tool Setting: 10 V/DIV., 100 ms./DIV.

B139210E01

E51

B118684E03

(a) Disconnect the E51 ECU connector.

(b) Measure the resistance and voltage according to
the value(s) in the table below.
Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
SGND (E51-2) - Body ground W-B - Body ground Ground Always Below 1 Ω
GND (E51-1) - Body ground W-B - Body ground Ground Always Below 1 Ω
B (E51-7) - Body ground P - Body ground +B power supply Always 10 to 14 V
Power switch off 0V
IG2 (E51-6) - Body ground B - Body ground Ignition power supply
Power switch on (IG) 10 to 14 V

If the result is not as specified, there may be a

malfunction on the wire harness side.
5. CHECK HYBRID VEHICLE CONTROL ECU

C64 A61

E133945E01
 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM EI–23

(a) Measure the resistance and voltage according to

the value(s) in the table below.
Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
E1 (C64-14) - Body ground W-B - Body ground Ground Always Below 1 Ω
E01 (C64-51) - Body ground W-B - Body ground Ground Always Below 1 Ω
E02 (C64-65) - Body ground B-W - Body ground Ground Always Below 1 Ω
E03 (C64-25) - Body ground B - Body ground Ground Always Below 1 Ω
E04 (C64-48) - Body ground W - Body ground Ground Always Below 1 Ω EI
ME01 (C64-13) - Body ground B - Body ground Ground Always Below 1 Ω
Battery (for measuring
battery voltage and for
BATT (A61-4) - E1 (C64-14) W - W-B Always 10 to 14 V
hybrid vehicle control ECU
memory)

Power source of hybrid Power switch off Below 1 V

+B1 (A61-2) - E1 (C64-14) Y - W-B
vehicle control ECU Power switch on (IG) 10 to 14 V
Power switch off Below 1 V
Immobiliser code ECU
IMI (A61-42) - E1 (C64-14) Y - W-B Pulse generation
input signal Power switch on (IG)
(see waveform 1)
Power switch off Below 1 V
Immobiliser code ECU
IMO (A61-41) - E1 (C64-14) G - W-B Pulse generation
output signal Power switch on (IG)
(see waveform 2)

If the result is not as specified, the hybrid vehicle

control ECU may have a malfunction.
(b) Inspect using an oscilloscope.
(1) Waveform 1 (Reference)

Item Content
Symbols (Terminal No.) IMI (A61-42) - E1 (C64-14)
GND Tool Setting 10 V/DIV., 100 ms./DIV.
Condition Power switch on (IG)

Tool Setting: 10 V/DIV., 100 ms./DIV.

B139210E01
 EI–24 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM

(2) Waveform 2 (Reference)

Item Content
Symbols (Terminal No.) IMO (A61-41) - E1 (C64-14)
Tool Setting 10 V/DIV., 100 ms./DIV.
GND Condition Power switch on (IG)

6. CHECK MAIN BODY ECU (INSTRUMENT PANEL J/B)

EI (a) Disconnect the IF and IM junction block connectors.

Tool Setting: 10 V/DIV., 100 ms./DIV.

B139209E01
 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM EI–25

(b) Disconnect the E8, E7 and E6 main body ECU

(Instrument panel J/B) connectors.

Vehicle Rear Side

EI
IM

IF

Vehicle Front Side

E8

E7

E6

B128347E01

(c) Measure the resistance and voltage according to

the value(s) in the table below.
Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
GND1 (IF-10) - Body ground W-B - Body ground Ground Always Below 1 Ω
GND2 (IM-9) - Body ground W-B - Body ground Ground Always Below 1 Ω
GND3 (E8-1) - Body ground W-B - Body ground Ground Always Below 1 Ω
AM1 (E7-6) - Body ground L - Body ground +B power supply Always 10 to 14 V
AM2 (E6-1) - Body ground L - Body ground +B power supply Always 10 to 14 V
 EI–26 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM

If the result is not as specified, there may be a

malfunction on the wire harness side.
DIAGNOSIS SYSTEM
CG SG CANH SIL 1. CHECK DLC3
(a) The vehicle's ECU uses ISO 15765-4 for
communication protocol. The terminal arrangement
of the DLC3 complies with SAE J1962 and matches
EI the ISO 15765-4 format.

CANL BAT
H100769E16

Symbols (Terminal No.) Terminal Description Condition Specified Condition

SIL (7) - SG (5) Bus "+" line During transmission Pulse generation
CG (4) - Body ground Chassis ground Always Below 1 Ω
SG (5) - Body ground Signal ground Always Below 1 Ω
BAT (16) - Body ground Battery positive Always 10 to 14 V
CANH (6) - CANL (14) CAN bus line Power switch off* 54 to 69 Ω

CANH (6) - CG (4) HIGH-level CAN bus line Power switch off* 200 Ω or higher

CANL (14) - CG (4) LOW-level CAN bus line Power switch off* 200 Ω or higher

CANH (6) - BAT (16) HIGH-level CAN bus line Power switch off* 6 kΩ or higher

CANL (14) - BAT (16) LOW-level CAN bus line Power switch off* 6 kΩ or higher

NOTICE:
*: Before measuring the resistance, leave the
vehicle as is for at least 1 minute and do not
operate the power switch, any other switches or
the doors.
If the result is not as specified, the DLC3 may have
a malfunction. Repair or replace the harness and
connector.
(b) Connect the cable of the intelligent tester (with CAN
VIM) to the DLC3, turn the power switch on (IG) and
attempt to use the intelligent tester. If the screen
displays a communication error message, a
problem exists in the vehicle side or tester side.
HINT:
• If communication is normal when the tool is
connected to another vehicle, inspect the DLC3
on the original vehicle.
• If communication is still impossible when the tool
is connected to another vehicle, the problem is
probably in the tool itself. Consult the Service
Department listed in the tool's instruction manual.
DLC3
Intelligent Tester
C131977E01
 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM EI–27

DTC CHECK / CLEAR

1. CHECK DTC
(a) Connect the intelligent tester to the Controller Area
Network Vehicle Interface Module (CAN VIM). Then
connect the CAN VIM to the DLC3.
(b) Turn the power switch on (IG).
(c) Read the DTCs by following the directions on the
tester screen. EI
HINT:
Refer to the intelligent tester operator's manual for
further details.

DLC3
Intelligent Tester
C131977E01

2. CLEAR DTC
(a) Connect the intelligent tester (with CAN VIM) to the
DLC3.
(b) Turn the power switch on (IG).
(c) Erase the DTCs by following the directions on the
tester's screen.
HINT:
Refer to the intelligent tester operator's manual for
further details.

DLC3
Intelligent Tester
C131977E16
 EI–28 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM

DATA LIST / ACTIVE TEST

1. READ DATA LIST
HINT:
Using the intelligent tester to read the DATA LIST allows
the values or states of switches, sensors, actuators and
other items to be read without removing any parts. This
non-intrusive inspection can be very useful as
EI intermittent conditions or signals may be discovered
before parts or wiring is disturbed. Reading the DATA
LIST information early in troubleshooting is one way to
save diagnostic time.
(a) Connect the intelligent tester (with CAN VIM) to the
DLC3.
(b) Turn the power switch on (IG).
(c) Read the DATA LIST.

DLC3
Intelligent Tester
C131977E16

SMART KEY:
Tester Display Measurement Item/Range Normal Condition Diagnostic Note
ON: Power switch on (ACC, IG)
Power switch on (IG) signal / ON
IG SW or start -
or OFF
OFF: Power switch off
ON: Power switch on (ACC, IG)
Power switch on (ACC) signal /
ACC SW or start -
ON or OFF
OFF: Power switch off
Immobiliser system status / SET SET: Key is not in cabin
IMMOBILISER -
or UNSET UNSET: Key is in cabin
MATCH: Master key code is sent
Master key code signal / MATCH
MASTER KEY NO MATCH: Unmatched master -
or NO MATCH
key code is sent
MATCH: Sub-key (master key)
Sub-key (Master key) code signal code is sent
SUB KEY -
/ MATCH or NO MATCH NO MATCH: Unmatched sub-key
(master key) code is sent
Transponder chip signal / OK or OK: Correct data sent
ENCRYPT CODE -
NG NG: Incorrect data sent
Transponder chip signal / OK or OK: Correct data sent
SERIAL NUMBER -
NG NG: Incorrect data sent
Transponder chip signal / OK or OK: Correct data sent
FRAME -
NG NG: Incorrect data sent
Transponder chip signal / OK or OK: Correct data sent
RESPONSE -
NG NG: Incorrect data sent
Transponder chip signal / OK or OK: Correct data sent
BCC -
NG NG: Incorrect data sent
Transponder chip data / OK or OK: Data OK
STATUS -
NG NG: Data error
 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM EI–29

2. PERFORM ACTIVE TEST

HINT:
Performing the intelligent tester's ACTIVE TEST allows
relay, VSV, actuator and other items to be operated
without removing any parts. Performing the ACTIVE
TEST early in troubleshooting is one way to save time.
The DATA LIST can be displayed during the ACTIVE
TEST.
(a) Connect the intelligent tester (with CAN VIM) to the
EI
DLC3.
(b) Turn the power switch on (IG).
(c) Perform the ACTIVE TEST by following the
directions on the tester screen.

DLC3
Intelligent Tester
C131977E16

MAIN BODY:
Tester Display Test Part Control Range Diagnostic Note
SECURITY INDIC Turn security indicator ON/OFF -
 EI–30 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM

DIAGNOSTIC TROUBLE CODE CHART

1. CERTIFICATION ECU DIAGNOSTIC TROUBLE CODE
CHART
CERTIFICATION ECU
DTC Code Detection Item Trouble Area See page
B2784 Antenna Coil Open / Short 1. Wire harness EI-28
2. Power switch

EI B2785 Communication Malfunction between ECUs

3. Certification ECU
1. Wire harness EI-30
Connected by LIN 2. Certification ECU
3. Main body ECU (Instrument panel J/B)
4. Steering lock ECU
5. ID code box
B2786 No Response from Steering Lock ECU 1. Wire harness EI-34
2. Certification ECU
3. Steering lock ECU
B2789 No Response from ID BOX 1. Wire harness EI-37
2. Certification ECU
3. ID code box
B278A Short to GND in Immobiliser System Power 1. Wire harness EI-40
Source Circuit 2. Power switch
3. Certification ECU
B2790 ID BOX EEPROM Malfunction ID code box EI-43
B2791 Communication Condition Failure between ECM - EI-44

2. HYBRID VEHICLE CONTROL ECU DIAGNOSTIC

TROUBLE CODE CHART
HINT:
The DTCs for the engine immobiliser system are
specified above. If other codes are output, check the
DTC chart for the hybrid control system.
HYBRID VEHICLE CONTROL ECU
DTC Code Detection Item Trouble Area See page
B2799-542 Engine Immobiliser System Malfunction 1. Wire harness EI-46
2. Hybrid vehicle control ECU
3. ID code box
B2799-790 Engine Immobiliser System Malfunction 1. Wire harness EI-46
2. Hybrid vehicle control ECU
3. ID code box
 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM EI–31

DTC B2784 Antenna Coil Open / Short

DESCRIPTION
This DTC is output when there is an open or short in the key coil (built into power switch).
DTC No. DTC Detection Condition Trouble Area
• Wire harness
B2784 Antenna coil is open/shorted • Power switch
• Certification ECU EI
WIRING DIAGRAM

Power Switch Certification ECU

10 9
W
CODE E52 E58 CODE

9 GR 8
TXCT E52 E58 TXCT

B128331E05

INSPECTION PROCEDURE
NOTICE:
If the certification ECU is replaced, register the key and ECU communication ID (See page EI-9).

1 CHECK DTC OUTPUT

(a) Delete the DTCs (See page EI-25).

(b) Recheck for DTCs (See page EI-25).
Result
Result Proceed to
B2784 output recurs A
B2784 output does not recur B

B USE SIMULATION METHOD TO CHECK

A
 EI–32 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM

2 CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - POWER SWITCH)

(a) Disconnect the E58 ECU and E52 switch connectors.

Wire Harness Side Connector Front View:
(b) Measure the resistance according to the value(s) in the
table below.
E58 Standard resistance
Certification ECU
EI Tester Connection Specified Condition
E58-9 (CODE) - E52-10 (CODE)
Below 1 Ω
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 E58-8 (TXCT) - E52-9 (TXCT)
18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 E58-9 (CODE) - Body ground
10 kΩ or higher
E58-8 (TXCT) - Body ground

TXCT CODE
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
E52
Power Switch

1 2 3 4 5 6 7
8 9 10 11 12 13 14
TXCT
CODE
B119109E12

OK

3 REPLACE POWER SWITCH

(a) Replace the power switch (See page ST-126).

NEXT

4 CHECK DTC OUTPUT

(a) Delete the DTCs (See page EI-25).

(b) Recheck for DTCs (See page EI-25).
Result
Result Proceed to
B2784 output does not recurs A
B2784 output recur B

B REPLACE CERTIFICATION ECU

END
 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM EI–33

Communication Malfunction between ECUs

DTC B2785
Connected by LIN
DESCRIPTION
This DTC is output when LIN communication from the certification ECU stops for a certain amount of time.
HINT:
If this DTC B2785 is detected simultaneously with DTC B2786 , B2789 or B2287, troubleshoot DTC
B2786, B2789 or B2287 first.
EI
DTC No. B2785 B2786 B2789 B2287 Trouble Area
Wire harness
{ { - -
(Certification ECU - Steering lock ECU)
Wire harness
DTC Output { - { -
(Certification ECU - ID code box)
Wire harness
{ - - {
(Certification ECU - Main body ECU (Instrument panel J/B))

{: DTC is output
-: DTC is not output
DTC No. DTC Detection Condition Trouble Area
• Wire harness
• LIN communication from certification ECU stops for • Certification ECU
B2785 a certain amount of time • Main body ECU (Instrument panel J/B)
• Open or short in wire harness between ECUs • Steering lock ECU
• ID code box

WIRING DIAGRAM

Steering Lock ECU Certification ECU

No. 4 J/B

5 8 7 10
O O
LIN E51 4A 4F E58 LIN

Main Body ECU ID Code Box

Instrument Panel J/B

9 1 8 3
14 O O
LIN1 IR 4M 4F E50 LIN1

B128332E01
 EI–34 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM

INSPECTION PROCEDURE
NOTICE:
• If the certification ECU or ID code box is replaced, register the key and ECU communication ID
(See page EI-9).
• If the steering lock ECU or main body ECU is replaced, register the ECU code and ECU
communication ID (See page EI-9).

EI
1 CHECK DTC OUTPUT

(a) Delete the DTCs (See page EI-25).

(b) Recheck for DTCs (See page EI-25).
Result
Result Proceed to
B2785 output recurs A
B2785 output does not recur B

B USE SIMULATION METHOD TO CHECK

2 REPLACE CERTIFICATION ECU

(a) Replace the certification ECU.

NEXT

3 ELECTRICAL KEY REGISTRATION

(a) Register the electrical key code in the certification ECU

(See page EI-9).
NEXT

4 REGISTER ECU COMMUNICATION ID

(a) Register the ECU communication ID between the ID

code box and hybrid vehicle control ECU (See page EI-
9).
NEXT

5 CHECK DTC OUTPUT

(a) Delete the DTCs (See page EI-25).

(b) Recheck for DTCs (See page EI-25).
Result
Result Proceed to
B2785 output recurs A
B2785 output does not recur B
 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM EI–35

B END

6 REPLACE MAIN BODY ECU (INSTRUMENT PANEL J/B)

(a) Replace the main body ECU (Instrument panel J/B).

EI
NEXT

7 ECU CODE REGISTRATION

(a) Register the ECU code between the ECUs connected by

LIN communication (See page EI-9).
NEXT

8 CHECK DTC OUTPUT

(a) Delete the DTCs (See page EI-25).

(b) Recheck for DTCs (See page EI-25).
Result
Result Proceed to
B2785 output recurs A
B2785 output does not recur B

B END

9 REPLACE STEERING LOCK ECU

(a) Replace the steering lock ECU.

NEXT

10 ECU CODE REGISTRATION

(a) Register the ECU code between the ECUs connected by

LIN communication (See page EI-9).
NEXT

11 CHECK DTC OUTPUT

(a) Delete the DTCs (See page EI-25).

(b) Recheck for DTCs (See page EI-25).
Result
Result Proceed to
B2785 output recurs A
 EI–36 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM

Result Proceed to
B2785 output does not recur B

B END

EI REPLACE ID CODE BOX

 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM EI–37

DTC B2786 No Response from Steering Lock ECU

DESCRIPTION
This DTC is output when the certification ECU does not receive LIN communication from the steering lock
ECU for 10 seconds.
DTC No. DTC Detection Condition Trouble Area

B2786
• Certification ECU does not receive LIN
communication from steering lock ECU for 10
•
•
Wire harness
Certification ECU
EI
seconds
• Steering lock ECU
• Open or short in wire harness between ECUs

WIRING DIAGRAM

Steering Lock ECU Certification ECU

No. 4 J/B

5 8 7 10
O O
LIN E51 4A 4F E58 LIN

B128333E01

INSPECTION PROCEDURE
NOTICE:
• If the certification ECU is replaced, register the key and ECU communication ID (See page EI-9).
• If the steering lock ECU is replaced, register the ECU code and ECU communication ID (See
page EI-9).

1 CHECK DTC OUTPUT

(a) Delete the DTCs (See page EI-25).

(b) Recheck for DTCs (See page EI-25).
Result
Result Proceed to
B2786 output recurs A
B2786 output does not recur B

B USE SIMULATION METHOD TO CHECK

 EI–38 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM

2 CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - STEERING LOCK ECU)

(a) Disconnect the E58 and E51 ECU connectors.

Wire Harness Side Connector Front View: (b) Measure the resistance according to the value(s) in the
table below.
EI E58 Standard resistance
Certification ECU
Tester Connection Specified Condition
E58-10 (LIN) - E51-5 (LIN) Below 1 Ω
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 E58-10 (LIN) - Body ground 10 kΩ or higher
18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

NG REPAIR OR REPLACE HARNESS OR

LIN
CONNECTOR

E51
Steering Lock ECU

1 2 3 4 5 6 7

LIN
B118667E01

OK

3 REPLACE CERTIFICATION ECU

(a) Replace the certification ECU.

NEXT

4 ELECTRICAL KEY REGISTRATION

(a) Register the electrical key code in the certification ECU

(See page EI-9).
NEXT

5 REGISTER ECU COMMUNICATION ID

(a) Register the ECU communication ID between the ID

code box and hybrid vehicle control ECU (See page EI-
9).
NEXT
 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM EI–39

6 CHECK DTC OUTPUT

(a) Delete the DTCs (See page EI-25).

(b) Recheck for DTCs (See page EI-25).
Result
Result Proceed to
B2786 output recurs A EI
B2786 output does not recur B

B END

REPLACE STEERING LOCK ECU

 EI–40 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM

DTC B2789 No Response from ID BOX

DESCRIPTION
This DTC is output when the certification ECU does not receive LIN communication from the ID code box
for 10 seconds.
DTC No. DTC Detection Condition Trouble Area

EI B2789
• Certification ECU does not receive LIN
communication from ID code box for 10 seconds
•
•
Wire harness
Certification ECU
• Open or short in wire harness between ECUs • ID code box

WIRING DIAGRAM

ID Code BOX Certification ECU

No. 4 J/B

3 8 7 10
O O
LIN1 E50 4F 4F E58 LIN

B128333E02

INSPECTION PROCEDURE
NOTICE:
If the certification ECU or ID code box is replaced, register the key and ECU communication ID
(See page EI-9).

1 CHECK DTC OUTPUT

(a) Delete the DTCs (See page EI-25).

(b) Recheck for DTCs (See page EI-25).
Result
Result Proceed to
B2789 output recurs A
B2789 output does not recur B

B USE SIMULATION METHOD TO CHECK

 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM EI–41

2 CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - ID CODE BOX)

(a) Disconnect the E58 ECU and E50 ID code box

Wire Harness Side Connector Front View:
connectors.
(b) Measure the resistance according to the value(s) in the
table below. EI
E58 Standard resistance
Certification ECU Tester Connection Specified Condition
E58-10 (LIN) - E50-3 (LIN1) Below 1 Ω

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
E58-10 (LIN) - Body ground 10 kΩ or higher
18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

NG REPAIR OR REPLACE HARNESS OR

LIN CONNECTOR

E50
ID Code Box

1 2 3 4 5 6 7 8

LIN1
B113404E01

OK

3 REPLACE CERTIFICATION ECU

(a) Replace the certification ECU.

NEXT

4 ELECTRICAL KEY REGISTRATION

(a) Register the electrical key code in the certification ECU

(See page EI-9).
NEXT

5 REGISTER ECU COMMUNICATION ID

(a) Register the ECU communication ID between the ID

code box and hybrid vehicle control ECU (See page EI-
9).
NEXT
 EI–42 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM

6 CHECK DTC OUTPUT

(a) Delete the DTCs (See page EI-25).

(b) Recheck for DTCs (See page EI-25).
Result
Result Proceed to
EI B2789 output recurs A
B2789 output does not recur B

B END

REPLACE ID CODE BOX

 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM EI–43

Short to GND in Immobiliser System Power

DTC B278A
Source Circuit
DESCRIPTION
This DTC is output when the power switch power source supply line is open or shorted.
DTC No. DTC Detection Condition Trouble Area

B278A
Power switch power source supply line is open or
•
•
Wire harness
Power switch
EI
shorted
• Certification ECU

WIRING DIAGRAM

Power Switch Certification ECU

14 30
R
VC5 E52 E58 VC5

8 G 40
AGND E52 E58 AGND

17
W-B
E58 E

B139292E03

INSPECTION PROCEDURE
NOTICE:
If the certification ECU is replaced, register the key and ECU communication ID (See page EI-9).

1 CHECK DTC OUTPUT

(a) Delete the DTCs (See page EI-25).

(b) Recheck for DTCs (See page EI-25).
Result
Result Proceed to
B278A output recurs A
B278A output does not recur B
 EI–44 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM

B USE SIMULATION METHOD TO CHECK

2 CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - POWER SWITCH)

(a) Disconnect the E58 ECU and E52 switch connectors.

EI Wire Harness Side Connector Front View:
(b) Measure the resistance according to the value(s) in the
table below.
E58 Standard resistance
Certification ECU
Tester Connection Specified Condition
E58-30 (VC5) - E52-14 (VC5)
Below 1 Ω
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 E58-40 (AGND) - E52-8 (AGND)
18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 E58-30 (VC5) - Body ground
10 kΩ or higher
E58-40 (AGND) - Body ground

VC5 E AGND
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
E52
Power Switch

1 2 3 4 5 6 7
8 9 10 11 12 13 14

AGND VC5
B119109E13

OK

3 CHECK HARNESS AND CONNECTOR (POWER SWITCH POWER SOURCE)

(a) Reconnect the E58 ECU and E52 switch connectors.

Wire Harness Side Connector Rear View:
(b) Measure the voltage according to the value(s) in the
table below.
Standard voltage
E58 Tester Connection Condition Specified Condition
Certification ECU E58-30 (VC5) - Body Key is not in cabin Below 1 V
ground Power switch pressed 4.6 to 5.4 V

NG REPLACE CERTIFICATION ECU

VC5

B124164E08

OK
 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM EI–45

4 CHECK HARNESS AND CONNECTOR (POWER SWITCH BODY GROUND)

(a) Measure the resistance according to the value(s) in the

Wire Harness Side Connector Rear View:
table below.
Standard resistance
Tester Connection Specified Condition

E58 E58-40 (AGND) - Body ground Below 1 Ω EI

Certification ECU
NG REPLACE CERTIFICATION ECU

AGND
B124164E06

OK

REPLACE POWER SWITCH (See page ST-126)

 EI–46 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM

DTC B2790 ID BOX EEPROM Malfunction

DESCRIPTION
This DTC is output when the ID code box detects an internal malfunction.
DTC No. DTC Detection Condition Trouble Area
B2790 ID code box detects internal malfunction ID code box

EI
INSPECTION PROCEDURE
NOTICE:
If the ID code box is replaced, register the key and ECU communication ID (See page EI-9).

1 REPLACE ID CODE BOX

NEXT

END
 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM EI–47

Communication Condition Failure between

DTC B2791
ECM
DESCRIPTION
This DTC is output when the ID code box does not respond to a verification request signal from the hybrid
vehicle control ECU.
HINT:
• If the power switch is turned off immediately after the hybrid control system starts, DTC B2791 will be
EI
detected. If DTC B2791 is cleared, this DTC will not recur because it does not indicate a malfunction.
• If this DTC B2791 is detected simultaneously with DTC B2799-542 or B2799-790, troubleshoot DTC
B2799-542 or B2799-790 first.
DTC No. DTC Detection Condition Trouble Area
ID code box does not respond to a verification request
B2791 -
signal from hybrid vehicle control ECU

WIRING DIAGRAM

Hybrid Vehicle
Control ECU
ID Code Box

No. 4 J/B

42 7 11 10 6
Y L L
IMI A61 AE5 4C 4F E50 EFIO

B128335E05

INSPECTION PROCEDURE
NOTICE:
If the engine can be started even when DTC B2791 is output, the ID code box can be considered
normal. Be sure to recheck for DTCs after clearing the DTCs (See page EI-9).

1 CHECK HYBRID CONTROL SYSTEM

(a) Delete the DTCs (See page EI-25).

(b) Check that the hybrid control system starts.
Result
Result Proceed to
Hybrid control system does not start A
 EI–48 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM

Result Proceed to
Hybrid control system starts B

HINT:
Perform this step when the is turned off immediately
after the hybrid control system starts.
B END
EI A

2 CHECK DTC OUTPUT

(a) Recheck for DTCs (See page EI-25).

Result
Result Proceed to
B2791 and other DTC output A
No DTC output B

HINT:
If the hybrid control system does not start, DTC B2791
will not be detected separately from other DTCs because
DTC B2791 will be output together with other DTCs.
Troubleshoot DTCs other than DTC B2791.
B GO TO SMART KEY SYSTEM (See page ST-
10)

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM EI–49

DTC B2799-542 Engine Immobiliser System Malfunction

DTC B2799-790 Engine Immobiliser System Malfunction

DESCRIPTION
This DTC is output when one of the following occurs: 1) the hybrid vehicle control ECU detects errors in its
own communications with the ID code box; 2) the hybrid vehicle control ECU detects errors in the
communication lines; or 3) the ECU communication ID between the ID code box and hybrid vehicle
EI
control ECU is different and an hybrid control system start is attempted. Before troubleshooting for this
DTC, make sure no certification ECU DTCs are present. If present, troubleshoot the certification ECU
DTCs first.
DTC No. DTC Detection Condition Trouble Area
One of following conditions is met:
• Error in communication between hybrid vehicle
control ECU and ID code box • Wire harness
B2799 - 542
• Error in communication lines • Hybrid vehicle control ECU
E2799 - 790
• Communication ID is different between ID code box • ID code box
and hybrid vehicle control ECU during
communication

WIRING DIAGRAM

Hybrid Vehicle
Control ECU
ID Code Box

No. 4 J/B

42 7 11 10 6
Y L L
IMI A61 AE5 4C 4F E50 EFIO

41 13 4 5 5
G G G
IMO A61 AE5 4C 4F E50 EFII

B128336E06

INSPECTION PROCEDURE
NOTICE:
• If the ID code box is replaced, register the key and ECU communication ID (See page EI-9).
• If the hybrid vehicle control ECU is replaced, register the ECU communication ID (See page EI-
9).
 EI–50 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM

1 CHECK DTC OUTPUT

(a) Delete the DTCs (See page EI-25).

(b) Recheck for DTCs (See page EI-25).
Result
Result Proceed to
EI B2799 output recurs A
B2799 output does not recur B

B USE SIMULATION METHOD TO CHECK

2 RE-REGISTER ECU COMMUNICATION ID

(a) Re-register the ECU communication ID (See page EI-9)

between the ID code box and hybrid vehicle control
ECU.
NEXT

3 CHECK DTC OUTPUT

(a) Delete the DTCs (See page EI-25).

(b) Recheck for DTCs (See page EI-25).
Result
Result Proceed to
B2799 output recurs A
B2799 output does not recur B

B END

A
 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM EI–51

4 CHECK HARNESS AND CONNECTOR (ID CODE BOX - HYBRID VEHICLE CONTROL ECU)

(a) Disconnect the E50 ID code box and A61 hybrid vehicle
Wire Harness Side Connector Front View: control ECU connectors.
E50
(b) Measure the resistance according to the value(s) in the
ID Code Box table below.
Standard resistance EI
Tester Connection Specified Condition
E50-5 (EFII) - A61-41 (IMO)
Below 1 Ω
E50-6 (EFIO) - A61-42 (IMI)
E50-5 (EFII) - Body ground
10 kΩ or higher
E50-6 (EFIO) - Body ground

EFII EFIO
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
A61
Hybrid Vehicle Control ECU

IMO IMI
B139364E01

OK

5 REPLACE HYBRID VEHICLE CONTROL ECU

(a) Replace the hybrid vehicle control ECU (See page HV-
570).
NEXT

6 REGISTER ECU COMMUNICATION ID

(a) Register the ECU communication ID between the ID

code box and hybrid vehicle control ECU (See page EI-
9).
NEXT

7 CHECK DTC OUTPUT

(a) Delete the DTCs (See page EI-25).

(b) Recheck for DTCs (See page EI-25).
 EI–52 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM

Result
Result Proceed to
B2799 output recurs A
B2799 output does not recur B

B END

EI A

REPLACE ID CODE BOX

 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM EI–53

ID Code Box Power Source Circuit

DESCRIPTION
This circuit provides power to operate the ID code box.

WIRING DIAGRAM
EI
ID Code Box

EFI NO. 1
1
E50 +B

O25
Fusible
Link Block
8
E50 GND

BATTERY

B139225E05

INSPECTION PROCEDURE
NOTICE:
If the ID code box is replaced, register the key and ECU communication ID (See page EI-9).

1 INSPECT FUSE (EFI NO. 1)

(a) Remove the EFI No. 1 fuse from the No. 1 engine room
R/B.
(b) Measure the resistance of the fuse.
Standard resistance:
Below 1 Ω
 EI–54 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM

NG REPLACE FUSE

OK

2 CHECK HARNESS AND CONNECTOR (ID CODE BOX - BATTERY)

(a) Disconnect the E50 ID code box connector.

EI Wire Harness Side Connector Front View: (b) Measure the voltage according to the value(s) in the
table below.
Standard voltage
Tester Connection Specified Condition
E50
ID Code Box E50-1 (+B) - Body ground 10 to 14 V

NG REPAIR OR REPLACE HARNESS OR

CONNECTOR
1 2 3 4 5 6 7 8

+B

B107455E17

OK

3 CHECK HARNESS AND CONNECTOR (ID CODE BOX - BODY GROUND)

(a) Measure the resistance according to the value(s) in the

Wire Harness Side Connector Front View: table below.
Standard resistance
Tester Connection Specified Condition
E50-8 (GND) - Body ground Below 1 Ω
E50
ID Code Box
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR

1 2 3 4 5 6 7 8

GND

B107455E18

OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See page
EI-16)
 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM EI–55

Certification ECU Power Source Circuit

DESCRIPTION
This circuit provides power to operate the certification ECU.

WIRING DIAGRAM
EI
Certification ECU

EFI NO. 1
1
E58 +B1

O25
Fusible
Link Block
17
E58 E

BATTERY

B139225E06

INSPECTION PROCEDURE
NOTICE:
If the certification ECU is replaced, register the key and ECU communication ID (See page EI-9).

1 INSPECT FUSE (EFI NO. 1)

(a) Remove the EFI No. 1 fuse from the No. 1 engine room
R/B.
(b) Measure the resistance of the fuse.
Standard resistance:
Below 1 Ω
 EI–56 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM

NG REPLACE FUSE

OK

2 CHECK WIRE HARNESS (CERTIFICATION ECU - BATTERY)

(a) Disconnect the E58 ECU connector.

EI Wire Harness Side Connector Front View:
(b) Measure the voltage according to the value(s) in the
table below.
Standard voltage
E58 Tester Connection Specified Condition
Certification ECU
E58-1 (+B) - Body ground 10 to 14 V

NG REPAIR OR REPLACE HARNESS OR

1 2 3 4 5 6 7 8 9 1011 121314151617 CONNECTOR
1819202122232425262728293031323334353637383940

+B

B107456E47

OK

3 CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - BODY GROUND)

(a) Measure the resistance according to the value(s) in the

Wire Harness Side Connector Front View:
table below.
Standard resistance
Tester Connection Specified Condition
E58
Certification ECU E58-17 (E) - Body ground Below 1 Ω

NG REPAIR OR REPLACE HARNESS OR

CONNECTOR
1 2 3 4 5 6 7 8 9 1011 121314151617
1819202122232425262728293031323334353637383940

B107456E40

OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See page
EI-16)