Toyota Supra 1990 Manual page 209

EFI SYSTEM - Troubleshooting with Volt/Ohmmeter (7M-GEl FI-35
CD
• +8 (+81) - E1
CD
There is no voltage between ECU terminals +B (+B1) and E1.
(lG SW ON)
®
Check that there is voltage between ECU terminal +B (+B1l and
body ground. (lG SW ON)
NO
.~
OK
FI3761
l
Check wiring between ECU terminal E1 and body ground.
~
OK
~
BAD
Voltmeter
I
Try another ECU. Repair or replace.
Check fuse, fusible links and wiring BAD
harness.
Repair or replace.
FI0312
OK
Check EFI main relay.
BAD
Replace.
(See page FI-109)
OK
Refer to M-REL - E1 trouble
section.