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 HO2S connector(C41).
IG KEY : ON , Engine : OFF
Measure voltage between terminal 3 of the HO2S harness connectorC41 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 to ground in harness between main relay and HO2S.
And go to "Verification of Vehicle Repair" procedure.
IG KEY : OFF , Engine : OFF
Disconnect HO2S connector(C41) and ECM connector.
Measure resistance between terminal 4 of the HO2S harness connectorC41 and 4 of the ECM harness connectorC22-3.
Specification : Approx. 0Ω
Is resistance display near the specified value?
YES
Go to "Check for Short to Ground in Harness" procedure.
NO
Repair as necessary and go to "Verification of Vehicle Repair" procedure.
IG KEY : OFF , Engine : OFF
Disconnect HO2S connector(C41).
Measure resistance between terminal 4 of the HO2S harness connectorC41 and chassis ground.
Specification : Approx.∞Ω
Is the resistance near the specified value?
YES
Go to "Component Inspection" procedure.
NO
Repair as necessary and go to "Verification of Vehicle Repair" procedure.
