C1623 CAN Time-out Steering Angle Sensor - Automotive Repair Guides & Equipment

COMPONENT LOCATION

GENERAL DESCRIPTION

The Steering wheel angle sensor uses two sensors ( A-sensor and B-sensor ) to determine the direction of the rotation. The main components of each sensor are LED, photo transistor and slit plate.

The slit plate, which has 45 holes, is installed between LED and photo transistor, and generates signals if slit plate rotates according to the steering wheel rotation.

The sensor signals are generated by photo transistor which is driven whenever the light passes through the holes. The HECU detects operating speed and direction of the steering wheel by this input signal, and the signal is used to input signal for anti-roll control.

DTC DESCRIPTION

The HECU checks the CAN communication lines for normal control and if a steering angle sensor’s message is not received for a certain period, this DTC is set.

DTC DETECTING CONDITION

Item

Detecting Condition

Possible cause

DTC Strategy

CAN message monitoring

Faulty Steering Angle Sensor(SAS)

Open or short in CAN communication line

Enable Conditions

When the steering anlge sensor’s messages are not received for more than 0.5 second with a normal voltage condition

Fail Safe

Inhibit the ESP control and allow the ABS/EBD control.

The ESP warning lamp is activated.

DIAGNOSTIC CIRCUIT DIAGRAM

TERMINAL AND CONNECTOR INSPECTION

1.	Many malfunctions in the electrical system are caused by poor harness(es) and terminal condition. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.

2.	Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.

Has a problem been found?

	▶ Repair as necessary .
	▶ Go to “Power Circuit Inspection” procedure.

POWER CIRCUIT INSPECTION

■ Open or Short Check

1.	Ignition “OFF”

2.	Disconnect Steering Angle Sensor connector.

3.	Ignition “ON” & Engine “OFF”

Measure voltage between power terminal of the steering angle sensor harness connector and chassis ground.

Approx. 12V

Is the measured value within specifications?

	▶ Go to “Ground Circuit Inspection” procedure.
	▶ Repair open or short in power circuit between steering angle sensor and HECU.

GROUND CIRCUIT INSPECTION

■ Open or Short Check

1.	Ignition “OFF” & Engine “OFF”.

2.	Disconnect steering angle sensor connector.

Measure resistance between ground terminal of the steering angle sensor harness connector and chassis ground.

Approx. below 1Ω

Is the measured value within specifications?

	▶ Go to “Signal Circuit Inspection” procedure.
	▶ Repair open or short in ground circuit between steering angle sensor and HECU

SIGNAL CIRCUIT INSPECTION

■ Open or Short Check

1.	Ignition “OFF”

2.	Disconnect Steering Angle Sensor connector and HECU connector.

3.	Measure resistance between CAN-High terminal of Steering Angle Sensor harness connector and CAN-High terminal of HECU harness connector.

Measure resistance between CAN-Low terminal of Steering Angle Sensor harness connector and CAN-Low terminal of HECU harness connector.

Below approx. 1Ω

Is the measured value within specifications?

	▶ Go to “Component Inspection” procedure.
	▶ Repair open in the signal circuit between Steering Angle Sensor and HECU

COMPONENT INSPECTION

1.	Ignition “OFF” & Engine “OFF”.

2.	Ignition “ON” & Engine “OFF”.

3.	Connect scantool and select “Diagnostic Trouble Codes(DTCs)” mode.

4.	Using a scantool, Clear DTC.

5.	Using a scantool, Check DTC present.

Are any DTCs present ?

▶ This DTC may be caused by an incorrect calibration of the steering angle sensor. Perform the calibration of the sensor by scantool again.
This DTC may be caused by an improper installation of the steering angle sensor. Check it for the installation.
If there is no problem about the above items, Substitute with a known-good Steering Angle Sensor and check for proper operation. If problem is corrected, replace Steering Angle Sensor.

▶ This fault is intermittently caused by poor connection of the Steering Angle Sensor.

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