- Before proceeding with the inspection, explain to the customer that the output DTC is related to temporary loss of the steering
angle zero point calibration, such as when the power source voltage drops when the battery is removed, and confirm that this
condition occurred.
HINT
- When DTC U0073, U0123, U0124 and/or U0126 is output together with DTC C1439 and/or C1445, inspect and repair the
trouble areas indicated by DTC U0073, U0123, U0124 and/or U0126 first See: U Code Charts/U0073.
- When the speed sensor or the yaw rate and acceleration sensor has trouble, DTCs for the steering angle sensor may be output
even when the steering angle sensor is normal. When DTCs for the speed sensor or yaw rate and acceleration sensor are
output together with other DTCs for the steering angle sensor, inspect and repair the speed sensor and yaw rate and
acceleration sensor first, and then inspect and repair the steering angle sensor.
PROCEDURE
1. CHECK DTC
(a) Clear the DTCs See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems/Testing and Inspection/Reading and
Clearing Diagnostic Trouble Codes.
(b) Turn the engine switch off.
(c) Turn the engine switch on (IG) again and check that no CAN communication system DTCs are output See: Powertrain
Management/Computers and Control Systems/Information Bus/Testing and Inspection/Initial Inspection and Diagnostic
Overview/CAN Communication System/Diagnosis System.
(d) Drive the vehicle and turn the steering wheel to the right and left at a speed of 35 km/h (22 mph) and check that no speed sensor and
yaw rate and acceleration sensor DTCs are output See: Brakes and Traction Control/Antilock Brakes / Traction Control
Systems/Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes.
Result:
HINT
- If there is a malfunction in the speed sensor or the yaw rate and acceleration sensor, an abnormal value may be output
although the steering angle sensor is normal.
- If the speed sensor and the yaw rate and acceleration sensor DTCs are output simultaneously, repair the sensors and inspect
the steering angle sensor.
- If the same DTC C1439 and/or C1445 is not output again, the DTC may have been stored due to a temporary loss of the
steering angle zero point calibration, such as when the power source voltage drops.
D -- CHECK FOR INTERMITTENT PROBLEMS See: Accessories and Optional Equipment/Antitheft and Alarm
Systems/Diagrams/Diagnostic Aids/How To Troubleshoot ECU Controlled Systems/How To Proceed With Troubleshooting
C -- REPAIR CIRCUIT INDICATED BY OUTPUT DTC See: Diagnostic Trouble Code Descriptions/Vehicle Stability Control
System
B -- INSPECT CAN COMMUNICATION SYSTEM See: Powertrain Management/Computers and Control Systems/Information
Bus/Testing and Inspection/Initial Inspection and Diagnostic Overview/CAN Communication System/How to Proceed With
Troubleshooting
A -- Continue to next step.
2. CHECK STEERING ANGLE SENSOR ZERO POINT CALIBRATION
(a) Drive the vehicle straight ahead at 35 km/h (22 mph) or more for at least 5 seconds.
(b) Check that the centered 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 off-centered position of the steering wheel, acquire
yaw rate and acceleration sensor zero point again after the adjustments are completed.
OK:
The steering wheel is centered correctly.
NG -- ADJUST FRONT WHEEL ALIGNMENT OR STEERING POSITION See: Maintenance/Alignment/Service and
Repair/Front Wheel Alignment
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