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DTC C1550: ECU internal error
DTC C1554: Speed sensor is out of range
DTC C1555: Steering angle SNS.out of range
DTC C1556: Detection part abnormality
DTC C1608: EEPROM fail
 
 
caution
  • If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C - Troubleshooting ).
  • Whenever ECU is replaced, ensure that the CAN bus lines are normal.
  • When the steering column switch assembly (Integrated with steering wheel sensor) is replaced, always carry out calibration to make ASC-ECU learn the neutral point (Refer to ).
 
 
OPERATION
The steering wheel sensor outputs the steering wheel status to ASC-ECU via the CAN bus lines.
 
 
DTC SET CONDITIONS
DTC C1550
  • When the system detects an abnormal power supply voltage.
  • When the system detects an abnormal steering wheel turning speed.
  • Failure of a sensor element
DTC C1554
  • When the system detects an extremely high steering wheel turning speed.
DTC C1555
  • When the system detects an abnormal steering wheel angle.
DTC C1556
  • When the system detects an abnormal power supply voltage.
DTC C1608
  • When the system detects malfunction on read or written data.
 
 
PROBABLE CAUSES
Current trouble
  • Malfunction of the steering column switch assembly (Integrated with steering wheel sensor)
Past trouble
  • Carry out diagnosis with particular emphasis on wiring harness and connector failures between ASC-ECU and the wheel speed sensor. For diagnostic procedures, refer to How to treat past trouble (GROUP 00 - How to Cope with Intermittent Malfunctions ).
 
 
DIAGNOSIS
Check again if the DTC is set in the steering wheel sensor.