Toyota Supra 1990 Manual page 205

EFI SYSTEM - Troubleshooting with Volt/Ohmmeter (7M-GE)
FI-31
ECU
+B
Symbol Terminal Name
EOl
POWER GROUND
E02 POWER GROUND
No. 10 INJECTOR (No.1 and 4)
No. 20
INJECTOR (No.2 and 6)
STA
STARTER SWITCH
No. 30
INJECTOR (No.3 and 5)
STJ COLD START INJECTOR
El COMPUTER GROUND
NSW
NEUTRAL START SWITCH (A/T)
N/C
CLUTCH SWITCH (MIT)
*lHT
OXYGEN SENSOR HEATER
ISCl ISC MOTOR NO.1 COIL
ISC3 ISC MOTOR NO.3 COIL
ISC2 ISC MOTOR NO.2 COIL
ISC4 ISC MOTOR NO.4 COIL
G8
DISTRIBUTOR
VFl
CHECK CONNECTOR
Gl
DISTRIBUTOR
ECU Terminals
..........
I
E01 No. STA STJ
Nl?.YI
ISC ISC
G8
m
10
NC
1 2
E02
No. No.
E1 HT
ISC ISC
VF1
20 30 3
4
* 1 California vehicles only
*2 A/T only
F 10299
Symbol
TEl
G2
VTA
NE
IDL
IGT
*lTHG
IGF
*10X2
THW
KNK
OXl
E2
VSVl
Ll
-
L2
M-REL
L.......J
G1 G2
NE
EFI SYSTEM CHECK PROCEDURE
HINT:
• Perform all voltage measurements with the cennectors
connected .
• Verify that the battery voltage is 11 V or above when
the ignition switch is at ON.
Using a voltmeter with high impedance (10
kON
minimum),
measure the voltage at each terminal of the wiring con-
nector.
Terminals of ECU
Terminal Name Symbol Terminal Name
CHECK CONNECTOR
L3 TEMS(ECT) COMPUTER
DISTRIBUTOR
EGR VSV (EGR)
THROTTLE POSITION SENSOR
AIC
AIC MAGNETIC SWITCH
DISTRIBUTOR
SPD SPEEDOMETER
THROTTLE POSITION SENSOR
W WARNING LIGHT
IGNITER
FP FUEL PUMP RELAY
EGR GAS TEMP. SENSOR DFG
DEFOGGER RELAY
IGNITER
THA AIR TEMP. SENSOR
SUB-OXYGEN SENSOR
*2ECT
ECT COMPUTER
WATER TEMP. SENSOR VS
AIR FLOW METER
KNOCK SENSOR
LP HEADLIGHT RELAY
OXYGEN SENSOR VC
AIR FLOW METER
SENSOR GROUND
*1 Ell
COMPUTER GROUND
VSV (AIR CONTROL) BATT
BATTERY
TEMS(ECT) COMPUTER
+B
EFI MAIN RELAY
-
IGSW IGNITION SWITCH
TEMS(ECT) COMPUTER +Bl
EFI MAIN RELAY
EFI MAIN RELAY (COIL) -
-
I
L.......J
IGT IGF trH~
OX1 VSV
M·
EGFi SPD
IG
-
FP THA VS
VC BATT
1
REL SW
TE1 VTfl IDL rrHG OX2
KN~
E2 L1 L2 L3 AIC
W
DGF Eel
LP
E11
+8 +81
FI0574