Toyota Supra 1990 Manual page 240

FI-66
EFI
SYSTEM - Troubleshooting with Volt/Ohmmeter (7M-GTE)
No. Terminals
Trouble
Condition
STD Voltage
11
W - E1
No voltage
No. trouble ("CHECK ENGINE" warning light
8 - 14V
off) and engine running
ECU
......
FUSE
-...:r- W
GAUGE 7.5A
"CHECK ENGINE"
Warning Light
Combination Meter
El
~
FI0728
CD CD
There is no voltage between ECU terminals Wand El.
(Idling)
®
Check that there is voltage between ECU terminal Wand body
ground.
NO
i
OK
F12772
®
Check wiring between ECU terminal El and body
ground.
ECU
!OK
..~
BAD
Voltmeter
~~!~~I~~I~!~~
Try another ECU.
Repair or replace.
Check GAUGE fuse (7.5A) and "CHECK
ENGINE" warning light.
OK
~BAD
F12773
I
Repair or replace.
ECU
®
l
Fuse blows again
Check wiring between ECU BAD
terminal Wand fuse.
Repair or replace.