Code No. C1554:
Steering angle speed error
Code No. C1555: Overflow error
Code No. C1550:
ECU failure
Code No. C1556: Detection part abnormality
Code No. C1608: Malfunction
of EEPROM (Data flash access error)
| caution |
- If there is any
problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis,
diagnose the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table
 ).
- Whenever ECU is replaced, ensure that the CAN bus lines are normal.
- When the steering wheel sensor is replaced, always carry out calibration to make
ASTC-ECU learn the neutral point (Refer to ).
|
OPERATION
The steering wheel sensor outputs the steering wheel status to ASTC-ECU via the CAN bus
lines.
DIAGNOSIS CODE SET CONDITIONS
Code No. C1554
- When the system detects an extremely high steering wheel turning speed.
Code No. C1555
- When the system detects an abnormal steering wheel angle.
Code No. 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
Code No. C1556
- When the system detects an abnormal power supply voltage.
Code No. C1608
- When the system detects malfunction on read or written data.
PROBABLE CAUSES
Current trouble
- The CAN bus line is defective.
- Malfunction of the steering wheel sensor
Past trouble
- Carry out diagnosis with particular emphasis on wiring harness and
connector failures between ASTC-ECU and the wheel speed sensor. For diagnosis procedures, refer
to How to treat past trouble (GROUP 00 - How to Cope with Intermittent Malfunctions ).
|
|
STEP 1. M.U.T.-III CAN bus diagnosis
|
|
|
Use the M.U.T.-III to diagnose the CAN bus lines.
|
|
|
Q.
Is the check result normal?
|
|
|
 Go to Step 3.
|
|
|
|
|
|
 Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
On completion, go to Step 2.
|
|
|
|
|
|
STEP 2. Diagnosis code recheck after resetting CAN bus lines
|
|
|
Q.
Is diagnosis code No. C1554, C1555, C1550, C1556 or C1608 set?
|
|
|
Go to Step 3.
|
|
|
|
|
|
This diagnosis is complete.
|
|
|
|
|
|
STEP 3. Check whether the diagnosis code is set again.
|
|
|
Check again if the diagnosis code is set.
|
|
|
(1)Erase the diagnosis code.
|
|
|
(2)Turn the ignition switch to the "LOCK" (OFF) position.
|
|
|
(3)Turn the ignition switch to the "ON" position.
|
|
|
(4)Check if the diagnosis code is set.
|
|
|
(5)Turn the ignition switch to the "LOCK" (OFF) position.
|
|
|
Q.
Is diagnosis code No. C1554, C1555, C1550, C1556 or C1608 set?
|
|
|
Replace the steering wheel sensor. (Refer to .)
Then go to Step 4.
|
|
|
|
|
|
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to Cope with Intermittent Malfunction ).
|
|
|
|
|
|
STEP 4. Check whether the diagnosis code is set again.
|
|
|
Check again if the diagnosis code is set.
|
|
|
(1)Erase the diagnosis code.
|
|
|
(2)Turn the ignition switch to the "LOCK" (OFF) position.
|
|
|
(3)Turn the ignition switch to the "ON" position.
|
|
|
(4)Check if the diagnosis code is set.
|
|
|
(5)Turn the ignition switch to the "LOCK" (OFF) position.
|
|
|
Q.
Is diagnosis code No. C1554, C1555, C1550, C1556 or C1608 set?
|
|
|
Return to Step 1.
|
|
|
|
|
|
The procedure is complete.
|
|
|
|