Inspection Of Diagnosis Circuit

HM11

Does "CHECK ENGINE" warning light come on when ignition switch is at ON?

YES

System Normal

Does "CHECK ENGINE" warning light come on when ECU terminal W is grounded to the body?

Check wiring between ECU terminal El and body ground.

Check bulb, fuse and wiring between ECU and ignition switch.

t BAD

Repair or replace.

Try another ECU.

Repair or replace.

Does "CHECK ENGINE" warning light go off when the engine is started?

Check wiring between ECU and "CHECK ENGINE" warning light.

I OK

System Normal

Repair.

I OK

Is there diagnostic code output when check connector terminals Tei and Ei are connected?

NO

Check wiring between ECU terminal TE1 and check connector terminal Tei , and ECU terminal E1 and check connector terminal Et.

| YES

(OK

Does "CHECK ENGINE" warning light go out after repair according to malfunction code?

NO

Further repair required.

Try another ECU.

j YES

System OK

Cancel out diagnostic code.

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