FI/EFI System — Inspection of Diagnosis Circuit, page 27

INSPECTION OF DIAGNOSIS CIRCUIT

STOP Fuse
EFI Fuse
No. 1 Main Relay
Fusible Link
Battery
Ignition S/W
Check Engine Warning Light
Check Connector

ECU
BAT
+B
M-REL
W
IG S/W
T
E1

1. Does CHECK ENG. warning light come on when ignition switch is at ON?
YES System Normal
NO

Does CHECK ENG. light come on when ECU terminal W is grounded to the body?
YES Check wiring between ECU terminal E1 and body ground
OK Try another ECU
NO

Check bulb, fuse and wiring between ECU and ignition switch.
BAD
Repair or replace

BAD
Repair or replace

2. Does CHECK ENG. warning light go OFF when engine is started?
YES System Normal
NO

Check wiring between ECU and CHECK ENG. warning light.
BAD Repair
OK

Is there diagnosis code output when service connector is short circuited?
NO Try another ECU
YES

Does CHECK ENG. warning light go out after repair according to malfunction code?
NO Further repair required
YES

System OK Cancel out Diagnostic code