Toyota 3F-E Repair Manual Supplement page 90

EFI SYSTEM — Tr oub l eshooting with Volt/Ohmmeter
ECU
0 0
o ooa000
^o
o0000000
Voltmeter
E1
IG SW —
•
There is no voltage between ECU terminals IG SW and El.
O
(IG SW ON)
Check that there is voltage between ECU terminal IG SW
and
Check fuse, fusible link and
ig
ignition switch.
• M-REL —
There is no voltage between ECU terminals M-REL and El.
O
M-REL
(IG SW ON)
0
oo 000000
^0000000a000
Check that there is voltage between ECU terminal M-REL
O
and body ground. (IG SW ON)
F 10315
Check EFI main relay and wiring
harness. (See page FI-70)
Try another ECU.
El
ground. (IG SW ON)
body
NO
OK
Check wiring between ECU terminal El and body
ground.
OK
Try another ECU.
El
NO
OK
Check wiring between ECU terminal El and
body ground.
OK
Try another ECU.
OK
FI-31
BAD
Replace or repair
I
BAD
Repair or replace
BAD
Replace or repair.
BAD
Replace.