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 35 km/h
(22 mph) or more for approximately 5 seconds. The ECU also stores the previous zero point.
If front wheel alignment or the steering wheel position is adjusted without disconnecting the cable from the negative (-) battery terminal, or if the
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 operation for the steering angle sensor zero point malfunction will be cleared by turning the engine switch off.
INSPECTION PROCEDURE
NOTICE:
When replacing the brake actuator assembly, perform zero point calibration and store system information See: Brakes and
Traction Control/Antilock Brakes / Traction Control Systems/Testing and Inspection/Programming and Relearning.
PROCEDURE
1. PERFORM ZERO POINT CALIBRATION OF YAW RATE AND ACCELERATION SENSOR
(a) Perform zero point calibration of the yaw rate and acceleration sensor See: Brakes and Traction Control/Antilock Brakes / Traction
Control Systems/Testing and Inspection/Programming and Relearning.
HINT
- When the stored zero point of the yaw rate and acceleration sensor is cleared, steering angle sensor zero point will also be
cleared.
- 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 35 km/h
(22 mph) or more.
NEXT -- Continue to next step.
2. CHECK STEERING ANGLE SENSOR ZERO POINT CALIBRATION
(a) Turn the engine switch off.
(b) Start the engine.
(c) Drive the vehicle straight ahead at 35 km/h (22 mph) or more for at least 5 seconds.
(d) Check that the center position of the steering wheel is correctly set while driving straight ahead.
HINT
If the front wheel alignment and steering position are adjusted as a result of an abnormal center position of the steering wheel,
acquire yaw rate and acceleration sensor zero point again after adjusting the front wheel alignment and steering position again.
OK:
The steering wheel is centered correctly.
NG -- ADJUST FRONT WHEEL ALIGNMENT OR STEERING POSITION See: Maintenance/Alignment/Service and
Repair/Front Wheel Alignment
OK -- Continue to next step.
3. RECONFIRM DTC
(a) Turn the engine switch off.
(b) Clear the DTCs See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems/Testing and Inspection/Reading and
Clearing Diagnostic Trouble Codes.
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