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 MAP sensor connector(C29).
IG KEY : ON , Engine : OFF
Measure voltage between terminal 2 of the MAP sensor harness connector C29 and chassis ground.
Specification : Approx. 5V
Is the voltage near the specified value?
YES
Go to "Signal Circuit Inspection" procedure.
NO
Check for an open or short to ground in harness between the ECM and the MAP sensor.
Repair as necessary and go to "Verification of Vehicle Repair" procedure
IG KEY : OFF , Engine : OFF
Disconnect MAP sensor connector(C29).
Measure resistance between terminal 1 of the MAFS harness connectorC29 and 15 of the ECM harness connectorC22-4.
Specification : Approx.∞Ω
Is the resistance near the specified value?
YES
Go to next "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 MAP sensor connector(C29).
Measure resistance between terminal 1 of the MAP sensor harness connectorC29 and chassis ground.
Specification : Approx.∞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".
