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 A/C Refrigerant Pressure Sensor, MAPS, TPS, APS connector.

IG "ON".

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

Measure voltage between power terminal of A/C Refrigerant Pressure Sensor harness connector and chassis ground.

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

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

Is the measured voltage within specification?

	▶ Go to "Component Inspection" procedure.
	▶ Go to "Check short to ground in power circuit" procedure.

IG "OFF" and disconnect A/C Refrigerant Pressure Sensor, MAPS, TPS, APS connector.

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

Measure resistance between power terminal of A/C Refrigerant Pressure Sensor harness connector and chassis ground.

Measure resistance between power terminal of TPS harness connector and chassis ground.

Measure resistance between power terminal of APS harness connector and chassis ground.

Is the measured resistance within specification?

	▶ If the circuit is insulated well and the sensor power supply from ECM/PCM is low, replace ECM/PCM and go to "Verification of Vehicle Repair".
	▶ Repair short to ground and go to "Verification of Vehicle Repair".