Lexus NX: Abnormal Zero Point of Steering Angle Sensor (C1290)
DESCRIPTION
The skid control ECU (brake booster with master cylinder assembly) acquires the steering sensor zero point every time the power switch is turned on (READY) and the vehicle is driven at 35 km/h (22 mph) or more for approximately 5 seconds. The skid control ECU (brake booster with master cylinder assembly) also stores the previous zero point.
If the front wheel alignment or the steering wheel position is adjusted without disconnecting the cable from the negative (-) auxiliary battery terminal, or if yaw rate and acceleration sensor zero point is not acquired after the adjustments have been completed, the skid control ECU (brake booster with master cylinder assembly) detects the difference between the previous zero point and newly acquired zero point and stores this DTC to indicate a poor adjustment.
Warning operation for the steering sensor zero point malfunction will be canceled by turning the power switch off.
| DTC No. | Detection Item | INF Code | DTC Detection Condition | Trouble Area | Note |
|---|---|---|---|---|---|
| C1290 | Abnormal Zero Point of Steering Angle Sensor | 751 | The steering sensor zero point is judged as an abnormal value. |
| - |
CAUTION / NOTICE / HINT
NOTICE:
When replacing the skid control ECU (brake booster with master cylinder assembly), perform initialization and calibration of the linear solenoid valve.
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PROCEDURE
| 1. | PERFORM ZERO POINT CALIBRATION OF YAW RATE AND ACCELERATION SENSOR |
(a) Perform zero point calibration of the yaw rate and acceleration sensor.
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| Tester Display |
|---|
| Test Mode |
HINT:
- When the stored zero point of the yaw rate and acceleration sensor is cleared, steering 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 sensor zero point cannot be acquired normally even if the vehicle is driven straight ahead at 35 km/h (22 mph) or more.
|
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| 2. | CHECK STEERING SENSOR ZERO POINT CALIBRATION |
(a) Turn the power switch off.
(b) Turn the power switch on (READY).
(c) Drive the vehicle straight ahead at 35 km/h (22 mph) or more for at least 5 seconds.
(d) Check that the steering wheel is centered correctly while driving straight ahead.
HINT:
If front wheel alignment and steering position are adjusted as a result of the steering wheel being off-center, acquire yaw rate and acceleration sensor zero point again after the adjustments are completed.
OK:
The steering wheel is centered correctly.
| NG | .gif) | ADJUST FRONT WHEEL ALIGNMENT OR STEERING POSITION |
|
| 3. | RECONFIRM DTC |
(a) Clear the DTCs.
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(b) Turn the power switch off.
(c) Turn the power switch on (READY).
(d) Drive the vehicle at a speed of 35 km/h (22 mph) or more and turn the steering wheel to the right and left.
(e) Check if the same DTC is output.
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| Result | Proceed to |
|---|---|
| DTC C1290 is not output. | A |
| DTC C1290 is output. | B |
| A | | END |
| B | | REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY |
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