Many malfunctions in the electrical system are caused by poor harness(es) 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.

Ignition Switch "OFF"

Refer to "Shop Manual" and disconnect the APS, A/C refrigerant pressure sensor, DPF DPS, EGR Actuator and VSA connector.

Ignition Switch "ON"

Measure voltage of Pin No. 5(APS2 power) of the APS connector and chassis ground.

Measure voltage of Pin No. 3(APT power) of the A/C refrigerant pressure sensor connector and chassis ground.

Measure voltage of Pin No. 1(DPF DPS power) of the DPF DPS connector and chassis ground.

Measure voltage of Pin No. 3(EGR actuator feedback power) of the EGR actuator connector and chassis ground.

Measure voltage of Pin No. 3(VSA actuator feedback power) of the VSA actuator connector and chassis ground.

Fig.1 ) Measure voltage of the APS 2 power

Fig.2 ) Measure voltage of the A/C refrigerant pressure sensor power

Fig.3 ) Measure voltage of the DPF DPS power

Fig.4 ) Measure voltage of the EGR actuator power

Fig.5 ) Measure voltage of the VSA power

Is the measured value withing specification?

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

Ignition Switch "OFF"

Disconnect battery (-) cable.

Refer to "Shop Manual" and disconnect the ECM/PCM connector.

Measure resistance of Pin No. 2(ground) of the ECM/PCM connector and chassis ground.

Measure resistance of Pin No. 4(ground) of the ECM/PCM connector and chassis ground.

Measure resistance of Pin No. 6(ground) of the ECM/PCM connector and chassis ground.

Is the measured value within specification?

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