Efi System Check Procedure; Terminals Of Ecu - Toyota 3F-E Repair Manual Supplement

FI-28
Symbol Terminal Name
E01 ENGINE GROUND
E02
ENGINE GROUND
No. 10 I NJECTOR (No. 1, 2, 3)
No. 20 I NJECTOR (No. 4, 5, 6)
HT1 OXYGEN SENSOR HEATER
HT2
OXYGEN SENSOR HEATER
STJ COLD START INJECTOR
El COMPUTER GROUND
T CHECK CONNECTOR
TWS WATER TEMP. SWITCH
ISC1 ISC MOTOR No. 1 COIL
ISC2 ISC MOTOR No. 2 COIL
ISC3 ISC MOTOR No. 3 COIL
ISC4 ISC MOTOR No. 4 COIL
Ge
DISTRIBUTOR
VFI
CHECK CONNECTOR
ECU Terminals
No
ISC
1 0 HT1 STJ T
E01
No .
ISC
HT2 El TWS
E02
20
EFI SYSTEM — Troubleshooting with Volt/ Ohmmeter

EFI SYSTEM CHECK PROCEDURE

Terminals of ECU

SymbOl
G1 DISTRIBUTOR
VF2 CHECK CONNECTOR
VTA THROTTLE POSITION SENSOR
NE DISTRIBUTOR
IDL THROTTLE POSITION SENSOR
Ell COMPUTER GROUND
OX1 OXYGEN SENSOR
OX2
OXYGEN SENSOR
THW
WATER TEMP. SENSOR
E2 SENSOR GROUND
IGF IGNITER
E22 SENSOR GROUND
IGT IGNITER
4WD 4WD INDICATOR
M-REL EFI MAIN RELAY
STP STOP LIGHT SWITCH
1
i
I
I
ISC
Ge
G1 — NE — OX1
1 2
ISC
VF1 VF2 VTA IDL Ell 0X2 E2
3 4
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.
Terminal Name Symbol
A/C
NSW
BATT
IG SW
M-
T
IGF IGT — EGRSPD FPU THA VS
HW
REL
—
E22 — STP
4WD
Terminal Name
EGR EGR VSV
A/C MAGNET SWITCH
SPD SPEED SENSOR
W WARNING LIGHT
FPU
FPU VSV
NEUTRAL START SWITCH
THA
AIR TEMP. SENSOR
STA STARTER SWITCH
VS AIR FLOW METER
Al Al VSV
AI AIR FLOW M ETE R
or o TH ROT-
VC
TLE POSITION SENSOR
BATTERY
+B EFI MAIN RELAY
IGNITION SWITCH
+B1 EFI MAIN RELAY
I
I
VC
BATT
W
STA Al — +B +B1
NSW
IG
SW
FI0574