Electronic Controlled Unit ECU
INSPECTION OF ECU
1. MEASURE VOLTAGE OF ECU
NOTE: The EFI circuit can be checked by measuring the resistance and voltage at the wiring connectors of the ECU.
Check the voltages at the wiring connectors.
• Remove the rear luggage compartment trim.
• Turn the ignition switch ON.
• Measure the voltage at each terminal.
NOTE: 1. Perform all, voltage measurements with the connectors connected.
2. Verify that the battery voltage is 11 V or above when the ignition switch is ON.
Connectors of ECU (4A-GE)
|
Symbol |
Terminal |
Symbol |
Terminal |
Symbol |
Terminal |
|
E01 |
Engine ground (Power) |
T |
Service connector |
*L3 |
ECT Computor |
|
E02 |
Engine ground (Power) |
TSW |
Water temperature switch |
*ECT |
ECT Computor |
|
No. 10 |
No.3, 4 injector |
IDL |
Throttle position sensor |
*L1 |
ECT Computor |
|
No. 20 |
No.1, 2 injector |
A/C |
A/C Magnet clutch |
*L2 |
ECT Computor |
|
STA |
Starter switch |
IGF |
Igniter |
VC |
Air flow meter |
|
IG |
Igniter |
E2 |
Sensor ground |
E21 |
Sensor ground |
|
VF |
Service connector |
G© |
Engine revolution sensor |
VS |
Air flow meter |
|
E1 |
Engine ground |
OX |
Oxygen sensor |
STP |
Stop light switch |
|
*' NSW |
Neutral Start Switch |
G© |
Engine revolution sensor |
THA |
Inlet air temp, sensor |
|
S/TH |
VSV (T-VIS) |
vcc |
Throttle position sensor |
SPD |
Speedometer sensor |
|
FPU |
VSV (FPU) |
*2 THG |
EGR temperature sensor |
BATT |
Battery |
|
V-ISC |
VSV (ISC) |
VTA |
Throttle position sensor |
— |
— |
|
W |
Warning light |
NE |
Engine revolution sensor |
+B1 |
EFI main relay |
|
HT |
Oxygen sensor heater |
THW |
Water temp, sensor |
+B |
EFI main relay |
|
ECU Connectors *2 : For Calif. |
|
|
|
I I |
|
I I |
|
I I |
|
|
|
E01 |
NO. 10 |
STA |
VF |
NSW |
FPU |
W |
T |
IDL |
IGF |
G© |
G© |
THG |
NE |
|
3 *L1 |
VC |
VS |
THA |
BATT |
+B1 |
|
E02 |
NO. 20 |
IGT |
E1 |
S/TH |
V-ISC |
HT |
TSW |
A/C |
: E2 |
OX |
VCC |
VTA |
THW |
ECl |
r *L2 |
E21 ! |
STP |
SPD |
|
+B |
|
fi0234 |
Voltage at ECU Wiring Connectors (4A-GE)
|
Terminals |
STD voltage |
Condition |
|
BATT - E1 |
10 - 14 |
— |
|
+B - E1 |
Ignition SW ON |
|
+B1 - E1 |
|
IDL - E2 |
M/T 4-5 A/T 10 - 14 |
Ignition SW ON |
Throttle valve open |
|
VTA - E2 |
0.1 - 1.0 |
Throttle valve fully closed |
|
4-5 |
Throttle valve fully open |
|
VCC - E2 |
4-6 |
Ignition SW ON |
|
VC - E2 |
6 - 10 |
Ignition SW ON |
— |
|
VS - E2 |
2 - 5.5 |
Measuring plate fully closed |
|
6-9 |
Measuring plate fully open |
|
2-8 |
Idling |
— |
|
THA - E2 |
1 - 3 |
Ignition SW ON |
Intake air temperature 20°C (68°F) |
|
THW - E2 |
0.1 - 1.0 |
Ignition SW ON |
Coolant temperature 80°C (176°F) |
|
STA - E1 |
6-14 |
Ignition SW ST position and press on the clutch pedal (M/T) |
|
No. 10 E01 No. 20 E02 |
9-14 |
Ignition SW ON |
|
IGT - E1 |
0.7 - 1.0 |
Idling |
|
T - E1 |
10 - 14 |
Ignition SW ON |
Service connector T Ex not short |
|
0.5 or less |
Service connector T <-► Ej short |
|
A/C - E1 |
5-14 |
Ignition SW ON |
A/C switch ON |
|
0.5 or less |
A/C switch OFF |
|
W - E1 |
0.5 or less |
Ignition SW ON |
|
9-14 |
Engine start |
|
S/TH - E1 |
0-2 |
Idling |
|
10 - 14 |
More than 4,350 rpm |
|
* NSW - E1 |
0 |
Ignition SW ON |
Shift position P or N range |
|
10- 14 |
Ex. P or N range |
|
6-11 |
Connectors of ECU (4A-GZE)
|
Symbol |
Terminal |
Symbol |
Terminal |
Symbol |
Terminal |
|
E01 |
Engine ground (Power) |
G2 |
Engine revolution sensor |
TIL |
Super charger indicator lamp. |
|
E02 |
Engine ground (Power) |
VTA |
Throttle position sensor |
A/C |
A/C Magnet clutch |
|
RSC |
ISC valve |
NE |
Engine revolution sensor |
SPD |
Speedometer sensor |
|
RSO |
ISC valve |
IDL |
Throttle position sensor |
W |
Warning light |
|
STA |
Starter switch |
VSV3 |
VSV (Air bypass) |
ELS1 |
Stop light |
|
IGT |
Igniter |
HT |
Oxygen sensor heater |
FPU |
VSV (FPU) |
|
EGR |
EGR valve |
IGF |
Igniter |
THA |
Inlet air temp, sensor |
|
E1 |
Engine ground |
OX |
Oxygen sensor |
KNK |
Knock sensor |
|
NSW |
Neutral start switch |
THW |
Water temperature sensor |
VS |
Airflow meter |
|
SMC |
Super charger relay |
E2 |
Sensor ground |
- |
— |
|
No. 10 |
No. 3, 4 injector |
R/P |
Fuel control switch |
VC |
Air flow meter |
|
- |
— |
E22 |
Sensor ground |
*2 THG |
EGR temperature sensor |
|
No. 20 |
No. 1, 2 injector |
VSV2 |
VSV (Air bleed) |
BATT |
Battery |
|
- |
— |
- |
— |
+B |
EFI main relay |
|
GG |
Engine revolution sensor |
L1 |
ECT computer |
ELS2 |
Accessory switch |
|
VF |
Service connector |
L3 |
ECT computer |
+B1 |
EFI main relay |
|
G1 |
Engine revolution sensor |
*> L2 |
ECT computer |
- |
— |
|
T |
Service connector |
ECT1 |
ECT computer |
- |
— |
*' : For A/T *2 : For Calif.
|
I |
|
I |
|
|
|
I |
|
I ^ I |
I «-■ 1 |
|
'-1 |
|
|
E01 |
RSC |
STA |
EGR |
NSW |
|
No. 10 |
No. 20 |
GS |
G1 |
G2 |
NE |
vsv 3 |
IGF |
thw |
|
R/P |
vsv 2 |
L1 |
L2 |
TIL |
SPD |
ELS 1 |
THA |
VS |
VC |
batt |
ELS 2 |
|
|
E02 |
RSO |
IGT |
E1 |
SMC |
— |
— |
Vf |
T |
vta |
IDL |
HT |
ox |
E2 |
E22 |
— |
L3 |
ECT 1 |
A/C |
W |
FPU |
KNK |
— |
THG |
+ B |
+B1 |
|
|
|
|
|
|
|
Voltage at ECU Wiring Connectors (4A-GZE)
|
Terminals |
STD voltage |
Condition |
|
BATT - E1 |
10 - 14 |
Z - E1 + B |
Ignition SW ON |
|
IDL - E2 |
M/T 4-5 A/T 10 - 14 |
Ignition SW ON |
Throttle valve open |
|
VTA - E2 |
0.1 - 1.0 |
Throttle valve fully closed |
|
4-5 |
Throttle valve fully open |
|
VC - E2 |
4-6 |
— |
|
VS - E2 |
4-5 |
Ignition SW ON |
Measuring plate fully closed |
|
0.02 - 0.5 |
Measuring plate fully open |
|
2-4 |
Idling |
|
THA - E2 |
1 - 3 |
Ignition SW ON |
Intake air temperature 20°C (68°F) |
|
THW - E2 |
0.1 - 1.0 |
Ignition SW ON |
Coolant temperature 80°C (1 76°F) |
|
STA - E1 |
6-14 |
Ignition SW ST position and press on the clutch pedal (M/T) |
|
No. 10 E01 No. 20 E02 |
9-14 |
Ignition SW ON |
|
IGT - E1 |
0.7 - 1.0 |
Idling |
|
T - E1 |
10 - 14 |
Ignition SW ON |
Service connector T E: not short |
|
0.5 or less |
Service connector T E: short |
|
A/C - E1 |
5-14 |
Ignition SW ON |
A/C switch ON |
|
0.5 or less |
A/C switch OFF |
|
W - E1 |
0.5 or less |
Ignition SW ON |
|
9-14 |
Engine start |
|
RSC - E1 RSO |
9-14 |
Ignition SW ON |
|
* NSW - E1 |
0 |
Ignition SW ON |
Shift position P or N range |
|
10 - 14 |
Ex. P or N range |
|
6-11 |
MEASURE RESISTANCE OF ECU CAUTION:
1. Do not touch the ECU terminals.
2. The tester probe should be inserted into the wiring connector from the wiring side.
Check the resistance between each terminal of the wiring connector.
• Remove the rear luggage compartment trim.
• Unplug the wiring connectors from the ECU.
• Measure the resistance between each terminal of the wiring connectors.
Resistances at ECU Wiring Connectors (4A-GE)
|
Terminals |
Condition |
Resistance |
|
IDL - E2 |
Throttle valve open |
Infinity |
|
Throttle valve fully closed |
2.3 kil or less |
|
VTA - E2 |
Throttle valve fully open |
3.3 - 10 kCl |
|
Throttle valve fully closed |
0.2 - 0.8 kil |
|
VC - E2 |
— |
100 - 300 a |
|
VS - E2 |
Measuring plate fully closed |
20 - 400 a |
|
Measuring plate fully open |
20 - 3,000 a |
|
VCC - E2 |
— |
3 - 7 kil |
|
THA - E2 |
Intake air temperature 20°C (68°F) |
2 - 3 kil |
|
THW - E2 |
Coolant temperature 80°C (176°F) |
0.2 - 0.4 kil |
|
G + - G © |
— |
140 - 180 a |
|
Resistances at ECU Wiring Connectors (4A-GZE) |
|
Terminals |
Condition |
Resistance |
|
IDL - E2 |
Throttle valve open |
Infinity |
|
Throttle valve fully closed |
2.3 kil or less |
|
VTA - E2 |
Throttle valve fully open |
3.3 - 10 kfl |
|
Throttle valve fully closed |
0.2 - 0.8 kil |
|
VS - E2 |
Measuring plate fully closed |
200 - 600 a |
|
Measuring plate fully open |
20 - 1,200 a |
|
THA - E2 |
Intake air temperature 20°C (68°F) |
2 - 3 ka |
|
THW - E2 |
Coolant temperature 80°C (176°F) |
0.2 - 0.4 ka |
|
G1 - G - , G2 - G-, NE - G0 |
— |
140 - 180 a |
 
|
| |
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