Many malfunctions in the electrical system are caused by poor harness(s) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
Check the following conditions:
Check for damaged harness and terminals: contact resistance, oxidation, bent or broken terminals.
Check for poor connection between ECM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection
Use a suitable male pin to ensure that contact in sockets is good. The pin should remain in position when pulled gently.
Has a problem been found?
YES
Repair as necessary and go to "Verification of Vehicle Repair" procedure.
NO
Go to "Power Circuit Inspection" procedure.
IG KEY : OFF , Engine : OFF
Disconnect Joint connector MC02.
IG KEY : ON , Engine : OFF
Measure voltage between terminal 11 of the Tachometer harness Joint connectorMC02 and chassis ground.
Specification] Approx. B+
Is the voltage near the specified value?
YES
Go to "Control Circuit Inspection" procedure.
NO
Repair open or short in harness , Go to "Vericication Vehicle Repair" procedure.
IG KEY : OFF , Engine : OFF
Disconnect Joint connector MC02.
Measure resistance between terminal 11 of the Tachometer harness Joint connectorMC02 and terminal 3 of ECM connector C21-2
[Specification] Approx. 0Ω
Is the resistance near the specified value?
YES
Go to "Check for Short to Ground" procedure.
NO
Repair open in harness, Go to "Verification of Vehicle Repair" procedure.
IG KEY : OFF , Engine : OFF
Disconnect Joint connector MC02 and ECM connector C21-2.
Measure resistance between terminal 11 of the Tachometer harness Joint connectorMC02 and chassis ground.
[Specification] 0Ω
Is the resistance near the specified value?
YES
Go to "Component Inspection" procedure.
NO
Repair open in harness, Go to "Verification of Vehicle Repair" procedure.edure.
