DTC C1290/66 Steering Angle Sensor Zero Point Malfunction

DESCRIPTION

The skid control ECU acquires steering angle sensor zero point every time the engine switch is turned on (IG) and the vehicle is driven at 22 mph (35 km/h) or more for approximately 5 seconds. The ECU also stores the previous zero point.

If front wheel alignment or steering wheel position is adjusted without disconnecting the negative battery terminal, or if yaw rate and acceleration sensor zero point is not acquired after the adjustments have been completed, the skid control ECU detects the difference between the previous zero point and newly acquired zero point and outputs this DTC to indicate a poor adjustment.

Warning of the steering angle sensor zero point malfunction will be cancelled by turning the engine switch off.

DTC No.	DTC Detection Condition	Trouble Area
C1290/66	The steering angle sensor zero point calibration position vastly differs from the recorded value	Yaw rate and acceleration sensor zero point calibration incomplete Poor adjustment of the centered position of the steering wheel Poor adjustment of front wheel alignment

INSPECTION PROCEDURE

NOTICE:

When replacing the skid control ECU, perform zero point calibration and store system information .

1.PERFORM ZERO POINT CALIBRATION OF YAW RATE AND ACCELERATION SENSOR

Perform zero point calibration of the yaw rate and acceleration sensor .

HINT:

When the stored zero point of the yaw rate and acceleration sensor is erased, steering angle sensor zero point will also be erased.

If the zero point and output value of the yaw rate and acceleration sensor and the output value of the speed sensors are not normal, steering angle sensor zero point cannot be acquired normally even if the vehicle is driven straight ahead at 22 mph (35 km/h) or more.

NEXT

2.CHECK STEERING ANGLE SENSOR ZERO POINT CALIBRATION

Drive the vehicle straight ahead at 22 mph (35 km/h) or more for at least 5 seconds.

Check that the centered position of the steering wheel is correctly set while driving straight ahead.

HINT:

If front wheel alignment and steering position are adjusted as a result of abnormal centered position of the steering wheel, acquire yaw rate and acceleration sensor zero point again after the adjustments are completed.

OK:
The centered position of the steering wheel is correctly set.

NG

ADJUST FRONT WHEEL ALIGNMENT OR STEERING POSITION

OK

3.RECONFIRM DTC

Turn the engine switch off.

Clear the DTC .

Check if the same DTC is recorded .

Result:
Condition Proceed to
DTC (C1290/66) is not output A
DTC (C1290/66) is output B

B

REPLACE SKID CONTROL ECU

A

USE SIMULATION METHOD TO CHECK

LEXUS IS250, IS220d / GSE20 ALE20

BRAKE CONTROL

Lexus IS250 IS220d GSE20 ALE20

VEHICLE STABILITY CONTROL SYSTEM w/ VDIM