C1290

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C1290/66: Steering Angle Sensor Zero Point Malfunction

DTC C1290/66 - Steering Angle Sensor Zero Point Malfunction

DESCRIPTION

The skid control ECU obtains steering angle sensor zero point every time the ignition switch is turned to the ON position and the vehicle is driven at 22 mph (35 km/h) or more for approximately 5 seconds. The skid control 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 obtained after the adjustments have been completed, the skid control ECU detects the difference between the previous zero point and newly obtained 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 ignition switch off.






INSPECTION PROCEDURE
NOTE: When replacing the brake actuator assembly, perform zero point calibration. Calibration

PROCEDURE

1. PERFORM ZERO POINT CALIBRATION OF YAW RATE AND ACCELERATION SENSOR
(a) Clear the calibration data .
(b) 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 obtained normally even if the vehicle is driven straight ahead at 22 mph (35 km/h) or more.

NEXT -- Continue to next step.
2. CHECK STEERING ANGLE SENSOR ZERO POINT CALIBRATION
(a) Connect the intelligent tester to the DLC3.
(b) Drive the vehicle straight ahead at 22 mph (35 km/h) or more for at least 5 seconds.
(c) Select the Data List mode on the intelligent tester .

ABS / VSC:





(d) Check that the centered position of the steering is correctly set while driving straight ahead.
OK:
When driving straight ahead, the degree is approximately 0.
When turning right, the degree shows "- (negative)" values.
When turning left, the degree shows "+ (positive)" values.
NG -- ADJUST FRONT WHEEL ALIGNMENT OR STEERING POSITION
OK -- Continue to next step.
3. RECONFIRM DTC
(a) Turn the ignition switch off.
(b) Clear the DTC .
(c) Drive the vehicle and turn the steering wheel to the right and left at the speed of 22 mph (35 km/h).
(d) Check if the same DTC is recorded .
Result:






B -- REPLACE BRAKE ACTUATOR ASSEMBLY
A -- END