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 then go to "Verification of Vehicle Repair" procedure.
	▶ Go to "Signal Circuit Inspection" procedure.

Ignition "OFF" & Engine "OFF".

Disconnect PCM/4WD ECM/SAS(Steering Angle Sensor) connector and HECU connector.

Measure resistance between CAN-High terminal of PCM/4WD ECM/SAS harness connector and CAN-High terminal of HECU harness connector.

Measure resistance between CAN-Low terminal of PCM/4WD ECM/SAS harness connector and CAN-Low terminal of HECU harness connector.

Is the measured resistance within specifications?

	▶ Go to "Check CAN communication line for short" procedure.
	▶ Repair open in the CAN communication line between PCM/4WD ECM/SAS and HECU, Go to "Verification of Vehicle Repair" procedure.

Ignition "OFF" & Engine "OFF".

Disconnect PCM/4WD ECM/SAS(Steering Angle Sensor) connector and HECU connector.

Measure resistance between CAN-High terminal of PCM/4WD ECM/SAS harness connector and chassis ground.

Measure resistance between CAN-Low terminal of PCM/4WD ECM/SAS harness connector and chassis ground.

Measure resistance between CAN-High terminal and CAN-Low of PCM/4WD ECM/SAS harness connector.

Is the measured resistance within specifications?

	▶ Fault is intermittent caused by faulty HECU/PCM/4WD ECM or was repaired and HECU memory was not cleared.
	▶ Repair short in the CAN communication line between PCM/4WD ECM/SAS and HECU, Go to "Verification of Vehicle Repair" procedure.