C1261 Steering Angle Sensor NOT Calibrated - 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 Steering Angle Sensor which is used for ESP control needs the zero-point setting for the normal operation because this sensor measures an absolute angle. The zero-point setting can be done by diagnostic tool. If the steering anlge sensor is not calibrated, the ECU detects a failure and sets this code.

DTC DETECTING CONDITION

Item

Detecting Condition

Possible cause

DTC Strategy

Signal Monitoring

A failure of SAS zero-point setting

Monitoring Period

During SAS 0 set.

Enable Conditions

If SAS sensor was not set a zero-point, SAS sensor failure is detected.

Fail Safe

Reduced controller function caused by faulty SAS signal. Allow the ABS/EBD control.

The ESP warning lamp is activated.

DIAGNOSTIC CIRCUIT DIAGRAM

MONITOR SCANTOOL DATA

Line up wheels like figure 1.

(1)	Perform the wheel alignment.

(2)	Set the steering wheel so that the wheels point straight ahead.

(3)	Go ahead and Go back the vehicle 2~3 times without holding steering wheel.

2.	Connect scantool to Data Link Connector(DLC).

3.	Perform SAS(ASP) calibration. (figure 2)

4.	Disconnect scantool from Data Link Connector(DLC).

5.	Check the condition of “SAS ZERO SET” by oprerating the vehicle (turn the right and the left at least more than one time)

Is “SAS ZERO SET” completed normally?


	▶ Substitute with a known-good HECU and check for proper operation. If problem is corrected, replace HECU

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