Toyota Supra 1990 Manual page 217

EFI SYSTEM - Troubleshooting with Volt/Ohmmeter (7M-GEI
FI-43
No. Terminals
Trouble
Condition
STD Voltage
8
IGT - E1 No voltage Idling O.7-1.0V
ECU
Ignition Switch
AM21
~
JlG2
I
J
To
,
( AM230A
~
Tachometer
Fusible
Igniter w/
Link
()MAIN 2.0L
Ignition Coil Iq
)J
f'1::::;r'
r--
-
-'T"-
IGF
Battery
I
....L.
.
IGT
'--
-
1
E1
-==-
FI3579
CD
There is no voltage between ECU terminals IGT and E1.
1 (Idling)
®
Check that there is voltage between ECU terminal IGT and body
2 ground. (Idling)
NO
~OK
FI1642
@
Check wiring between ECU BAD Repair or
terminal E1 and body ground. replace.
~
OK
Try another ECU.
Check fusible links and ignition BAD
Repair or replace.
switch.
OK
BAD
Check distributor. (See page IG-g)
Repair or replace.
@
OK
Check wiring between ECU and
BAD
battery.
Repair or replace.
OK
BAD
Check igniter.
Repair or replace.