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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 all connectors(and connections) for looseness, bending, corrosion, contamination, deterioration, and/or damage.

Has a problem been found ?

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

Disconnect HECU connector.

Measure voltage between Pin No.1(Power) terminal of HECU harness connector and chassis ground.

Specification : B+

Is measured value within specification?

	▶ Go to "Ground Circuit Inspection" procedure.
	▶ Repair the circuit and then go to "Verification of vehicle Repair" procedure.

Disconnect Battery (-) terminal.

Disconnect HECU connector.

Measure resistance between Pin No.13(Ground) and Pin No.38(Ground) terminal of HECU harness connector and chassis ground.

Specification : Approx. below 1Ω

Is measure value within specification?

	▶ If no problems were found with the circuits or connectors, replace the HECU. Go to "Verification of Vehicle Repair" procedure.
	▶ Repair the circuit and then go to "Verification of vehicle Repair" procedure.

caution

In case of replacing HECU, perform following procedures.

1. Perform "Auto Detected Configuration Reset(ESP(ESC) Only)" for Varian Coding.

Fig.1) 1st Screen of Vehicle S/W Management

Fig.2) 1st Screen of "Auto Detected Configuration Reset(ESP(ESC) Only)"

Fig.3) Final Screen of "Auto Detected Configuration Reset(ESP(ESC) Only)"

2. Perform "Steering Angle Sensor Calibration" for steering angle sensor.

Fig.1) S/W Mangement Main Screen

Fig.2) Steering Angle Sensor Calibration Screen

Fig.3) Condition Check Screen

Fig.4) Complete

3. "Longitudinal G-Sensor Calibration(HAC/DBC Only)" for longitudinal sensor offset correction.

Fig.1) 1st Screen of Vehicle S/W Management

Fig.2) 1st Screen of "Longitudinal G-Sensor Calibration(HAC/DBC Only)"

Fig.3) Final Screen of "Longitudinal G-Sensor Calibration(HAC/DBC Only)"

4. "HCU Air Bleeding Mode" for removing air in the HECU.

Fig.1) 1st Screen of Vehicle S/W Management

Fig.2) 1st Screen of "HCU Air Bleeding Mode"

Fig.3) 2st Screen of "HCU Air Bleeding Mode"

Fig.4) Complete