Toyota Supra 1990 Manual page 219

EFI SYSTEM - Troubleshooting with Volt/Ohmmeter (7M-GE)
FI-45
No.
I
Terminals Trouble
Condition
STD Voltage
10
I
W -
E1 No voltage
No. trouble ("CHECK ENGINE" warning light
8 -14 V
off) and engine running
ECU
FUSE
- f " "
W
GAUGE 7.5A "CHECK ENGINE"
Warning Light
Combination Meter
El
~
FI0728
CD
CD
There is no voltage between ECU terminals Wand El.
I
(Idling)
cv
Check that there is voltage between ECU terminal Wand body
ground.
NO
~
OK
FI1251
®
Check wiring between ECU terminal El and body
ground.
~OK
~
BAD
Try another ECU.
Repair or replace.
Voltmeter
Check GAUGE fuse (7.5A) and "CHECK
ENGINE" warning light.
OK
~BAD
FI1250
I
Repair or replace.
~
Fuse blows again
El ECU Check wiring between ECU BAD
terminal Wand fuse.
Repair or replace.
Ohmmeter
FI0311