Toyota 3F-E - EFI System Check Procedure; Terminals of ECU

FI-28
EFI SYSTEM —
Troubleshooting with Volt/ Ohmmeter
EFI SYSTEM CHECK PROCEDURE
HINT:
•
Perform all voltage measurements with the connectors
connected.
•
Verify that the battery voltage is 11 V or more when the
ignition switch is "ON" position.
Using a voltmeter with high impedance (10 kQ/V mini-
mum), measure the voltage at each terminal of the wiring
connectors.
Terminals of ECU
Symbol
Terminal Name
SymbOl Terminal Name
Symbol
Terminal Name
E01 ENGINE GROUND
G1
DISTRIBUTOR
EGR EGR VSV
E02
ENGINE GROUND
VF2
CHECK CONNECTOR
A/C
A/C MAGNET SWITCH
No. 10 I NJECTOR (No. 1, 2, 3)
VTA
THROTTLE POSITION SENSOR
SPD
SPEED SENSOR
No. 20 I NJECTOR (No. 4, 5, 6)
NE
DISTRIBUTOR
W
WARNING LIGHT
HT1
OXYGEN SENSOR HEATER
IDL
THROTTLE POSITION SENSOR
FPU
FPU VSV
HT2
OXYGEN SENSOR HEATER
Ell COMPUTER GROUND
NSW
NEUTRAL START SWITCH
STJ COLD START INJECTOR
OX1 OXYGEN SENSOR
THA
AIR TEMP. SENSOR
El COMPUTER GROUND
OX2
OXYGEN SENSOR
STA STARTER SWITCH
T CHECK CONNECTOR
THW
WATER TEMP. SENSOR
VS
AIR FLOW METER
TWS
WATER TEMP. SWITCH
E2 SENSOR GROUND
Al
Al VSV
ISC1 ISC MOTOR No. 1 COIL
IGF IGNITER
VC
FLOW
AIR AI
M R ETE
or o TH ROT-
TLE POSITION SENSOR
ISC2
ISC MOTOR No. 2 COIL
E22 SENSOR GROUND
BATT BATTERY
ISC3 ISC MOTOR No. 3 COIL
IGT
IGNITER
+B EFI MAIN RELAY
ISC4
ISC MOTOR No. 4 COIL
4WD 4WD INDICATOR
IG SW IGNITION SWITCH
Ge DISTRIBUTOR
M-REL
EFI MAIN RELAY
+B1
EFI MAIN RELAY
VFI
CHECK CONNECTOR
STP STOP LIGHT SWITCH
ECU Terminals
I
i 1
I
I I
E01
No
1
0
HT1 STJ T
ISC
1
ISC
2
Ge
G1
—
NE —
OX1
T
HW
IGF IGT
—
M-
REL
EGRSPD
FPU THA VS
VC
BATT
IG
SW
E02
No .
20
HT2
El
TWS
ISC
3
ISC
4
VF1
VF2 VTA IDL
Ell 0X2
E2
E22
—
4WD STP
—
W NSW
STA
Al —
+B +B1
FI0574
ProCarManuals.com