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 "Signal Circuit Inspection" procedure.
IG KEY : OFF , Engine : OFF
Disconnect IAT sensor connector(C55).
IG KEY : ON , Engine : OFF
Measure voltage between terminal 5 of the IAT sensor harness connector C55 and chassis ground.
Specfication: Approx. 5V
Is the voltage near the specified value?
YES
Go to " Component Inspection" procedure.
NO
Possibility of signal circuit malfunction.
Go to "Check for Short to Ground in Harness" procedure.
IG KEY : OFF , Engine : OFF
Disconnect IAT sensor connector(C55).
Measure resistance between terminal 5 of the IAT sensor harness connectorC55 and chassis ground.
Specification : infinite( ∞ Ω)
Is the resistance near the specified value?
YES
Go to "Component Inspection" procedure
NO
Repair as necerssary and go to "Verification of Vehicle Repair" procedure
