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

Measure resistance between CAN LOW terminal(CAN HIGH terminal) of the HECU harness connector and chassis ground.

Specification : ∞ Ω

Is the measured value within specifications ?

▶ Go to next procedure.

▶ If abnormal resistance is detected in CAN HIGH circuit, Repair short to ground in CAN HIGH circuit and then go to "Verification of vehicle Repair" procedure.

▶ If abnormal resistance is detected in CAN LOW circuit, Repair short to ground in CAN LOW circuit and then go to "Verification of vehicle Repair" procedure.

Measure resistance between CAN LOW terminal and CAN HIGH terminal of the HECU harness connector.

Specification : Approx. 120Ω

Is the measured value within specifications ?

▶ Check the resistances(122Ω) in PCM(ECM), repair as necessary and then go to "Verification of vehicle Repair" procedure.

▶ If above check is OK, go to "Component Inspection" procedure.

▶ In case of the resistance "approx. 1Ω" : Repair mutual short in CAN signal circuit of the HECU and then go to "Verification of vehicle Repair" procedure.

▶ In case of the resistance "∞ Ω" : Check the resistances(122Ω) in I/P junction box and open in CAN signal circuit of the HECU, repair as necessary and then go to "Verification of vehicle Repair" procedure.