Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.

Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.

Has a problem been found?

	▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.
	▶ Go to "Power Circuit Inspection" procedure.

IG "OFF" and Disconnect MAPS connector.

IG "ON".

Measure voltage between power terminal of MAPS harness connector and chassis ground.

Is the measured voltage within specification ?

	▶ Go to "Signal Circuit Inspection" Procedure.
	▶ Repair open or short in harness and go to "Verification of Vehicle Repair" procedure.

IG "OFF".

Disconnect MAPS and ECM connector.

Measure the resistance between signal terminal of MAPS harness connector and ground.

Is the measured resistance within specification ?

	▶ Go to "Check open in harness" as follows.
	▶ Repair short to ground in harness and go to "Verification of Vehicle Repair" procedure.

IG "OFF" and disconnect MAPS and ECM connector.

Measure resistance between signal terminal of MAPS harness connector and MAPS signal terminal of ECM harness connector.

Is the measured resistance within specification ?

	▶ Go to "Ground Inspection" procedure.
	▶ Repair open in harness and go to "Verification of Vehicle Repair" procedure.

IG "OFF" and disconnect MAPS connector and then IG "ON".

Measure voltage between signal terminal of MAPS harness connector and chassis ground. (Measurement "A")

Measure voltage between signal and ground terminals of MAPS harness connector. (Measurement "B")

Is the measured voltage within specification ?

	▶ Go to "Component Circuit Inspection" procedure.
	▶ Repair contact resistance or open in harnesss and then go to "Verification of Vehicle Repair" procedure.