Toyota Supra 1990 Manual page 227

EFI SYSTEM - Troubleshooting with Volt/Ohmmeter (7M-GTE)
FI-53
CD • IG SW - E1
ECU
CD
There is no voltage between ECU terminals IG SW and El .
(lG SW ON)
Voltmeter
~~~~~~
®
Check that there is voltage between ECU terminal IG SWand
body ground. (lG SW ON)
FI2758
NO
1
OK
Check wiring between ECU terminal El and body
ground.
ECU
1
0K
~BAD
Voltmeter
lJi~~~~~
Try another ECU.
Repair or replace.
I
CD
FI2759
Check fuse, fusible links and
BAD
ignition switch.
Repair or replace.
CD
• M-REL - E1
ECU
CD
There is no voltage between ECU terminals M-REL and El.
1 (lG SW ON)
®
Check that there is voltage between ECU terminal M·REL and
body ground. (lG SW ON)
FI2760
NO
t
OK
Check wiring between ECU terminal El and body
ground.
1
0K
lBAD
Try another ECU.
l
Repair or replace.
Check EFI main relay and wiring
BAD
I
I
harness.
Replace.
FI2761
OK
Try another ECU.
1