Engine Control

B–O

B–W B–W

5 AM2 IG2 6 B–W

ST2 4 R
I9

I11 B–W
Ignition SW

R–W R–W
B

B–W B–W
(* 1) (* 1)

(M/T)

(A/T)
R

R
B–O
(* 1)

6 IM R
E3
1 IA2 7 IG2 3 IA2 12 IG3 (A/T)
15A AM2

(M/T)

(A/T)
R

R
E B

Junction Connector
1

Clutch Start SW

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J 5(B), J 6(A)
R–W

R–W

R–W

B–W

B–W

B–W

B–W

B–O

B–O
(* 1)

(* 2)

(* 1)
3 IM A A A A

C10
B–R

(A/T)
R
(M/T)
B
3 EA1 10 EA1

2 IA5 9
B–W

B–W

10 IA4

Park/Neutral
Position SW
P
B–R

(M/T) N

P1
1 1 12 IC 5 IL 8 IK 6 IL
B

6
1 1 5 1
EFI Relay

2 2

(A/T)
B
11 IG3
30A MAIN

5 1
15A EFI

C/OPN Relay

3 2

1 1
1 1 Junction Connector
3 2
G A
W–B

1 1A 4 IG 19 ID 1 IG
J 6(A)
B

G A
B

B
(M/T)
G–R
B–R
B

(A/T)

FL MAIN B
4
2. 0L (M/T)
Fuel Pump

9 EA1 9 IG1
M G–R
F10

5
B

W–B
B

B
Battery I12

* 1 : 2ZZ–GE
* 2 : 1ZZ–FE

EB BH

2003 COROLLA MATRIX (EWD486U)

B–O B–O

B–W B–W

W–B W–B W–B

E2 E2 E2

B–W B–W B–W B–W

E3 E3 E3

R–W

B–W

B–W

B–W
W–B

W–B

W–B
B–W 1 4 1 4 1 4
Ignition Coil and

Ignition Coil and

Ignition Coil and

(*1) +B GND +B GND +B GND
Igniter No. 1

Igniter No. 2

Igniter No. 3
B–O
(*1) IGT IGF IGT IGF IGF IGT
I2

I3

I4
3 2 3 2 2 3
R

L–Y

GR
(A/T)
Y–G L–Y L–Y
R–L

L–Y

L–Y
F A F A F A F A

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B–W

R–W
(A/T)

B–O

Y–G
R–L

L–Y
(* 1)

(* 1)

GR
R

J 5(B), J 6(A) H B
W–B

Junction
Connector
8 B 9 D 8 D 3 D 8 A 9 A 10 A 23 A
NSW IGSW MREL BATT IGT1 IGT2 IGT3 IGF

E 3(A), E 4(B), E 5(C), E 6(D)

Engine Control Module

STA FC E03 E01 E02 RSD EVP

9 B 10 D 5 B 7 A 6 A 5 A 12 A
W–B

W–B

B–L

L–B
(M/T)
W–B

W–B
(A/T)

G–R
B

Junction Connector

Idle Air Control Valve

C A C A 1
J 3(A), J 4(B)

DUTY 1
VSV (EVAP)

B
GND VISC
V5

(A/T) B B B B
I1

3 2 2
B
(M/T)

G–R W–B
W–B

W–B

B B B B
I12 I12

ED

2003 COROLLA MATRIX (EWD486U)

 B
I5

L–Y
B–O

B–W
B–W

W–B
Ignition Coil and
Igniter No. 4

1
2
B L–W L–W

5 C

I12
8 IG2
2
1

ACLV
(*1) (* 1) (*1)

+B

IGF
V3
VSV (ACIS)

B
3
4
W

11 A
IGT

IGT4
GND

2
1
B L L

1 C

I12
17 IG3
CCV
Engine Control

V4
VSV (Canister Closed Valve)

2
1
Y B–W B–W

B
1 A
I12
8 IG1

#10
I6
Injector No. 1 B–W

2
1
B B–W

2 A
I12

#20

Engine Control Module

I7
Injector No. 2
B–W

E 3(A), E 4(B), E 5(C), E 6(D)

2
1
W B–W

3 A
I12

#30
I8
Injector No. 3

A
2
1

W–B W–B L B–W

28 B
4 A

IG
EC

10 IG3
#40
I9

J7
Injector No. 4

Junction
Connector
B

2003 COROLLA MATRIX (EWD486U)

25 A
OVL+
(* 1)

1
2
1

L–R L–Y

29 B
24 A

PSW
OVL–

(* 1)
P2 C3
Power Steering Oil Camshaft Timing Oil
Pressure SW Control Valve (VVTL)

1
B–W 33 B
OSW

(*1)
O3
Oil Pressure SW (VVTL)

B
B–O

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 B
B–O
Y

15 A
OCV+

1
3
B G

24 B

+B

I12
VG
VG
2
1
B–Y

14 A
OCV–

2
L–W C2

B
32 B

E2G
EVG
Camshaft Timing Oil
Control Valve (VVT)

5
4
BR Y–B

20 A

E2
THA
THA
M1
Mass Air Flow Meter

LG–B

7 D
FAN NO. 2 Relay

FAN

Engine Control Module

LG

6 D
FAN NO. 1 Relay

CF

E 3(A), E 4(B), E 5(C), E 6(D)

Y–B

2 C
M/G CLT Relay

ACMG
G–W

33 C
A/C SW

ACLD
Y

2003 COROLLA MATRIX (EWD486U)

A/C SW

31 C
A/CS
Defroster Mode SW

Y
13 A

Pressure SW
HP

1
2
W

19 A
THW
E2
Engine Coolant Temp. Sensor B–L
32 C

A/C Thermistor
THR
* 1 : 2ZZ–GE

B
BR
BR
B–O

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Engine Control

B–O B–O

From Power Source System (See Page 54)

10A 15A 15A

M–HTR/ TAIL STOP
DEF I–UP

Airbag Sensor Assembly

Cruise Control ECU

8 IL 7 IH 14 IC

G–W G–W

R–W
(A/T)
(USA) (USA)
GSW2 IDL

C16
A13
3 3 23 13
(Canada)

1 3 2
G

13 3C 11 3C

Stop Light SW

Y
TAIL Relay

S7
2 5 1
13 7 II
W

G–W

G–W
(A/T)

(A/T)
3 3
OFF
Control SW

L–W
(* 3)
(USA)

(USA)
G–B

Tail
6 IJ
Light

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5 IC 1 IL
Head

C12 10
Combination SW G
I7

G–W
(A/T)
(Canada)

Y
G

13 D 12 D 19 C 14 D 16 D
ELS2 ELS STP F/PS IDLO

E 3(A), E 4(B), E 5(C), E 6(D)

Engine Control Module

E2 PTNK VC VTA TBP

28 A 21 D 18 A 21 A 4 D
BR
L
BR

LG

R
Y

1 ID2 2 ID2 Y
7 IG3 8 ID2 VSV (Pressure Switching Valve)
BR

Throttle Position Sensor

L

Vapor Pressure Sensor

2 3 (*1)
BR

1 2 B A B A 1 3 (*2)
GRN VOUT
J 5(B), J 6(A)

1
Connector
Junction
Junction Connector

F B F B
5V
J 5(B), J 6(A)

V7

T1

3 D B 1 (*1)
2 (*2)
Y

V8

2
Y

H A H A H A
B
BR

6 ID2 16 IG3
BR

BR

BR Y 7 ID2

BR BR B

B B B

2003 COROLLA MATRIX (EWD486U)

B–O B–O

* 1 : 2ZZ–GE
* 2 : 1ZZ–FE
* 3 : w/ Cruise Control
* 4 : Shielded
Crankshaft Position Sensor

Camshaft Position Sensor

2 1
Junction Connector

A B
J 5(B), J 6(A)
C4

C1

1 E A E A 2
(* 4)
W

(* 4) (*4)

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(* 4)

W
B

(* 4) (*4)

E 3(A), E 4(B), E 5(C), E 6(D)

27 A 34 A 26 A Engine Control Module
NE+ NE– G22+

+B HT1A OX1A HT1B OX1B

1 D 4 B 23 B 4 C 21 B

P
(* 4)

(* 2)
(*1)

(*4)

(*1)
R
P

B 18 IG3 9 IG3
(*2)
P

(* 2)
Heated Oxygen Sensor

9 IG2 15 IG3
1 3
P–B

(*4)
(Bank 1 Sensor 1)

W
B

HT OX
(* 1)

(* 4)

(* 1)
R
P

3 4B
Heated Oxygen Sensor

Heated Oxygen Sensor

+B E1 1 3 (4WD)
2 4 2 4 (2WD)
H5

2 4
(Bank 1 Sensor 1)

(Bank 1 Sensor 2)

HT OX HT OX
6 IG3
2 4B 1 4B 4 4B 5 4B
(* 2)

(* 2)
BR
B

+B E1 +B E1
H5

H8
(* 1)

1 3 2 4 (4WD)
B

1 3 (2WD)
B
(*1)

(*4)

(*4)

(*4)
BR

BR
B

6
B B
I12 IG1
(*4) BR
I13
BR BR
I9
(*1)
BR
(*2)

2003 COROLLA MATRIX (EWD486U)

Engine Control

B–O B–O

From Power Source System (See Page 54)

D1
Data Link Connector 3

7. 5A
OBD

SIL TC WFSE SG CG BAT

7 13 15 5 4 16
7 IJ

W–B

R–B

R–B
P–B
L–R

BR
P

2 3B 3 4C 1 IG1

3 3B 4 4C
BR
P–B
L–R

(*4)

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(*4)

E 3(A), E 4(B), E 5(C), E 6(D)

18 D 20 D 19 D Engine Control Module
SIL TC WFSE

W–B
E1 KNK1 EKNK SPD TACH THWO W
7 B 1 B 2 B 17 C 5 D 14 C 11 D

R–Y R–Y
V–W

Y–R
BR

W
B

Y–R

V–W
(* 4)

(*4)

(*4)

(*4)

BR

2 1
A B A B A B A B 16 4B
Junction Connector
J 3(A), J 4(B)

K1 21 4B
Knock Sensor A A A A A A A A A A
W–B

BR
Connector

BR BR A
BR

Junction

8
BR BR
J2

IG3
BR BR EC IE
(*2) (* 2)

2003 COROLLA MATRIX (EWD486U)

B–O * 2 : 1ZZ–FE From Power Source System (See Page 54)
* 4 : Shielded

10A
GAUGE

2 IG

R–W
B–O

22 3B

16 3B 20 3B

(w/o ABS)
R–W
R–W

2 21

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Speedometer

Tachometer

14 IG3

(w/o ABS)
R–W
Indicator Lamp
Malfunction

Combination Meter

Junction Connector
B A
J 3(A), J 4(B)
C11

C B
16 36 27 17 18

R–Y
W–G
V–W
Y–R

Y–R

B 8 4C
9 I5
V–W
4C
(w/o ABS)
(w/ ABS)
W–G

W–G

Junction Connector

C A
(w/o ABS)

(w/o ABS)

J 5(B), J 6(A)
R–W

BR

10 IA3 4 IG3

C B
(w/o ABS)
(w/ ABS)
W–G

W–G

17 3 1 2
(w/o ABS)

SP1
BR

S1 V1
Skid Control ECU Vehicle Speed Sensor
with Actuator (Combination Meter)

EC

2003 COROLLA MATRIX (EWD486U)

Engine Control
System Outline
The engine control system utilizes a microcomputer and maintains overall control of the engine, etc. An outline of engine
control is given here.
1. Input Signals
(1) Engine coolant temp. signal system
The engine coolant temp. sensor detects the engine coolant temp. and has a built–in thermistor with a resistance which
varies according to the engine coolant temp. Thus the engine coolant temp. is input as a control signal to TERMINAL
THW of the engine control module.
(2) Intake air temp. signal system
The intake air temp. sensor is installed in the mass air flow meter and detects the intake air temp., which is input as a
control signal to TERMINAL THA of the engine control module.
(3) Power steering oil pressure signal system
Power steering oil pressure is detected by the power steering oil pressure SW and is input as a control signal to
TERMINAL PSW of the engine control module.
(4) RPM signal system
Camshaft position and crankshaft position are detected by the camshaft position sensor and crankshaft position sensor.
Camshaft position is input as a control signal to TERMINAL G22+ (2ZZ–GE) or G2+ (1ZZ–FE) of the engine control
module, and engine RPM is input into TERMINAL NE+.
(5) Throttle signal system
The throttle position sensor detects the throttle valve opening angle, which is input as a control signal to TERMINAL VTA
of the engine control module.
(6) Vehicle speed signal system

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The vehicle speed is detected by the ABS speed sensor and the signal is input to TERMINAL SPD of the engine control
module via the comb. meter and the skid control ECU with actuator. (w/ ABS)
The vehicle speed is detected by the vehicle speed sensor installed in the transaxle and the signal is input to
TERMINAL SPD of the engine control module via the comb. meter. (w/o ABS)
(7) NSW signal system (A/T)
The Park/Neutral position SW detects whether the shift position is in neutral or not, and inputs a control signal to
TERMINAL NSW of the engine control module.
(8) A/C SW signal system
The operating voltage of the A/C SW is detected and is input as a control signal to TERMINAL A/CS of the engine
control module.
(9) Battery signal system
Voltage is constantly applied to TERMINAL BATT of the engine control module. When the ignition SW is turned to on,
voltage for engine control module operation is applied via the EFI relay to TERMINAL +B of the engine control module.
(10) Intake air volume signal system
Intake air volume is detected by the mass air flow meter, and is input as a control signal to TERMINAL VG of the engine
control module.
(11) STA signal system
To confirm that the engine is cranking, the voltage applied to the starter motor during cranking is detected and is input as
a control signal to TERMINAL STA of the engine control module.
(12) Oxygen sensor signal system
The oxygen density in the exhaust gases is detected and is input as a control signal into TERMINALS OX1A and OX1B
of the engine control module. To maintain stable detection performance by the oxygen sensor, a heater is used for
warming the sensor. The heater is also controlled by the engine control module (HT1A and HT1B).
(13) Engine knock signal system
Engine knocking is detected by the knock sensor and input as a control signal to TERMINAL KNK1 of the engine control
module.
(14) Electrical load signal system
When systems which cause a high electrical load such as the rear window defogger, taillight are turned on, a signal is
input to TERMINALS ELS and ELS2 as a control signal.
(15) Vapor pressure signal system
Vapor pressure is detected by the vapor pressure sensor and is input as a control signal to TERMINAL PTNK of the
engine control module.

2003 COROLLA MATRIX (EWD486U)

2. Control System
∗ SFI system
The SFI system monitors the engine conditions through the signals, which are input from each sensor to the engine
control module. Based on this data and the program memorized in the engine control module, the most appropriate fuel
injection timing is decided and current is output to TERMINALS #10, #20, #30 and #40 of the engine control module,
operating the injectors (to inject fuel). This is the system which finely controls the fuel injection in response to the driving
conditions, through the engine control module.
∗ ESA system
The ESA system monitors the engine conditions using the signals, which are input to the engine control module from each
sensor. Based on this data and the program memorized in the engine control module, the most appropriate ignition timing
is decided and current is output to TERMINALS IGT1, IGT2, IGT3 and IGT4 of the engine control module. This output
controls the ignition coil and igniter No. 1 , No. 2 , No. 3 and No. 4 to produce the most appropriate ignition timing for the
driving conditions.
∗ IAC system
The IAC system increases the RPM and provides idle stability for fast idle–up when the engine is cold, and when the idle
speed has dropped due to electrical load and so on. The engine control module evaluates the signals from each sensor,
and outputs current to TERMINAL RSD to control the idle air control valve.
∗ Knock control system
Knock control system controls the gate based on the engine rotation speed and detects knocking by the peak value of the
knock sensor output during the gate open period, and then controls it to the most suitable ignition timing in proportion to
the driving condition.
∗ Evapoparge control system
This system leads the vapor stuck to the canister to the serge tank in order not to agitate the air fuel by adjusting the fuel

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injection volume.
The signal at this time will be output from TERMINAL EVP of the engine control module to VSV (EVAP).
3. Diagnosis System
With the diagnosis system, when there is a malfunctioning in the engine control module signal system,the malfunction
system is recorded in the memory. The malfunctioning system can be found by reading the display (Code) of the malfunction
indicator lamp.
4. Fail–Safe System
When a malfunction occurs in any system, if there is a possibility of engine trouble being caused by continued control based
on the signals from that system, the fail–safe system either controls the system by using the data (Standard values)
recorded in the engine control module memory or else stops the engine.

2003 COROLLA MATRIX (EWD486U)

Engine Control
Service Hints
C/OPN Relay
5–3 : Closed with the starter running and the engine running
EFI Relay
5–3 : Closed with the ignition SW at ON or ST position
E2 Engine Coolant Temp. Sensor
1–2 : Approx. 15.04 kΩ (–20°C, –4°F)
Approx. 5.74 kΩ ( 0°C, 32°F)
Approx. 2.45 kΩ (20°C, 68°F)
Approx. 0.318 kΩ (80°C, 176°F)
E3 (A), E4 (B), E5 (C), E6 (D) Engine Control Module
Voltage at engine control module wiring connectors
+B–E1 : 9–14 volts (Ignition SW at ON position)
VC–E1 : 4.5–5.5 volts (Ignition SW at ON position)
VTA–E1 : 0.3–0.8 volts (Ignition SW on and throttle valve fully closed)
: 3.2–4.9 volts (Ignition SW on and throttle valve fully open)
EVG–E1 : 3.3–3.9 volts (Ignition SW at ON position)
THA–E1 : 0.5–3.4 volts (Engine idling and intake air temp. 0–80°C, 32–176°F)
THW–E1 : 0.2–1.0 volts (Engine idling and engine coolant temp. 60–120°C, 140–248°F)
STA–E1 : 6–14 volts (Engine cranking)
IGT1, IGT2, IGT3, IGT4–E1 : Pulse generation (Engine idling)
IGF–E1 : Pulse generation (Engine idling)

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FC–E1 : 9–14 volts (Ignition SW on and engine stopping)
0–3 volts (Engine idling)
W–E1 : 9–14 volts (Engine idling and warning light off)
A/CS–E1 : 9–14 volts (Ignition SW on and A/C SW off)
SPD–E1 : Pulse generation (Driving approx. 20 km/h)
ELS–E1 : 7.5–14 volts (Ignition SW on and taillight on)
ELS2–E1 : 7.5–14 volts (Ignition SW on and rear window defogger on)
NSW–E1 : 0–3 volts (Engine cranking)
#10, #20, #30, #40–E1 : Pulse generation (Engine idling)
NE+ –NE– : Pulse generation (Engine idling)
RSD–E1 : Pulse generation (Engine idling)
G22+ –NE– : Pulse generation (Engine idling)
TBP–E1 : 9.0–14.0 volts (Ignition SW at ON position)
PTNK–E1 : 3.0–3.6 volts (Ignition SW at ON position and remove fuel cap)
OX1A, OX1B–E1 : Pulse generation (Maintain engine speed at 2500 rpm for two minutes after warming up.)
HT1A, HT1B–E1 : 9.0–14.0 volts (Ignition SW at ON position)
0–3.0 volts (Engine idling)
KNK1–E1 : Pulse generation (Engine idling)
EVP–E1 : 9.0–14.0 volts (Ignition SW at ON position)
TACH–E1 : Pulse generation (Engine idling)

2003 COROLLA MATRIX (EWD486U)

 : Parts Location
Code See Page Code See Page Code See Page
A13 38 I1 37 (1ZZ–FE) 35 (2ZZ–GE)
K1
34 (2ZZ–GE) 35 (2ZZ–GE) 37 (1ZZ–FE)
C1 I2
36 (1ZZ–FE) 37 (1ZZ–FE) 35 (2ZZ–GE)
M1
34 (2ZZ–GE) 35 (2ZZ–GE) 37 (1ZZ–FE)
C2 I3
36 (1ZZ–FE) 37 (1ZZ–FE) O3 35 (2ZZ–GE)
C3 34 (2ZZ–GE) 35 (2ZZ–GE) 35 (2ZZ–GE)
I4 P1
34 (2ZZ–GE) 37 (1ZZ–FE) 37 (1ZZ–FE)
C4
36 (1ZZ–FE) 35 (2ZZ–GE) 35 (2ZZ–GE)
I5 P2
C10 38 37 (1ZZ–FE) 37 (1ZZ–FE)
C11 38 35 (2ZZ–GE) 35 (2ZZ–GE)
I6 S1
C12 38 37 (1ZZ–FE) 37 (1ZZ–FE)
C16 38 35 (2ZZ–GE) S7 39
I7
D1 38 37 (1ZZ–FE) 35 (2ZZ–GE)
T1
34 (2ZZ–GE) 35 (2ZZ–GE) 37 (1ZZ–FE)
E2 I8
36 (1ZZ–FE) 37 (1ZZ–FE) V1 37 (1ZZ–FE)
E3 A 38 35 (2ZZ–GE) V3 35 (2ZZ–GE)
I9
E4 B 38 37 (1ZZ–FE) 35 (2ZZ–GE)
V4
E5 C 38 I11 39 37 (1ZZ–FE)

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E6 D 38 J2 39 35 (2ZZ–GE)
V5
F10 40 J3 A 39 37 (1ZZ–FE)
36 (1ZZ–FE) J4 B 39 V7 41
H5
39 (2ZZ–GE) J5 B 39 V8 41
H8 39 J6 A 39
I1 35 (2ZZ–GE) J7 39

: Relay Blocks

Code See Page Relay Blocks (Relay Block Location)

1 23 Engine Room R/B (Engine Compartment Left)
3 28 RH R/B (Right Side of the Instrument Panel Reinforcement)

: Junction Block and Wire Harness Connector

Code See Page Junction Block and Wire Harness (Connector Location)
IC 25 Engine Room Main Wire and Instrument Panel J/B (Lower Finish Panel)
ID 25 Floor Wire and Instrument Panel J/B (Lower Finish Panel)
IG
IH
25
II
IJ Instrument Panel Wire and Instrument Panel J/B (Lower
( Finish Panel))
IK
IL 24
IM
1A 23 Engine Wire and Engine Room J/B (Engine Compartment Left)
3B
29 Instrument Panel Wire and RH J/B (Right Side of the Instrument Panel Reinforcement)
3C
4B
32 Instrument Panel Wire and Center J/B (Behind the Combination Meter)
4C

2003 COROLLA MATRIX (EWD486U)

Engine Control
: Connector Joining Wire Harness and Wire Harness
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
42 (2ZZ–GE)
EA1 Engine Wire and Engine Room Main Wire (Inside of the Engine Room R/B)
44 (1ZZ–FE)
IA2
IA3
46 Engine Room Main Wire and Instrument Panel Wire (Instrument Panel Reinforcement LH)
IA4
IA5
ID2 46 Instrument Panel Wire and Floor Wire (Left Kick Panel)
IG1
IG2 48 Engine
g Wire and Instrument Panel Wire (Blower
( Unit RH))
IG3

: Ground Points

Code See Page Ground Points Location

42 (2ZZ–GE)
EB Front Left Suspension Tower
44 (1ZZ–FE)
42 (2ZZ–GE)
EC
44 (1ZZ–FE)
Left Side of the Cylinder Head
42 (2ZZ–GE)
ED

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44 (1ZZ–FE)
IE 46 Behind Combination Meter
IG 46 Right Kick Panel
BH 50 Left Quarter Panel

: Splice Points

Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
42 (2ZZ–GE) I7
E2 48 Instrument Panel Wire
44 (1ZZ–FE) I9
Engine Wire
42 (2ZZ–GE) I12
E3 48 Engine Wire
44 (1ZZ–FE) I13
I5 48 Instrument Panel Wire

2003 COROLLA MATRIX (EWD486U)