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DTC C123B: System Control too Long
 
 
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 - CAN Bus Diagnostics Table ).
  • Whenever ECU is replaced, ensure that the CAN bus lines are normal.
 
 
OPERATION
ASC-ECU controls ASC by calculating the data sent from the wheel speed sensor, the steering wheel sensor, and the G and yaw rate sensor.
 
 
 
DTC SET CONDITIONS
This DTC is set when ASC operates for a prolonged period.
noteThis DTC may be set when the vehicle runs on a slippery or rough road.
 
 
 
PROBABLE CAUSES
  • Steering wheel sensor malfunction
  • Improper installation of steering wheel sensor
  • ASC-ECU malfunction
  • Different steering wheel
  • Wheel alignment not performed
 
 
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE), diagnose the CAN bus lines.
(1)
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-IIISE).
Connect scan tool (M.U.T.-IIISE). Refer to "How to connect the Scan Tool (M.U.T.-IIISE) ."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the check result normal?
Go to Step 3.
Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ). After repairing the CAN bus line, go to Step 2.
 
STEP 2. DTC recheck after repairing the CAN bus line.
Is DTC C123B set?
Go to Step 3.
This diagnosis is complete.
 
STEP 3. Check whether the DTC is set again.
Check that DTCs No.C100A, C1015, C1020, C102B, C1011, C101C, C1027, C1032, C1014, C101F, C102A, C1035, C1041, C1042, C1043, C1044, C1219, C2205, C123C, and C2204 are also set.
Are DTCs No.C100A, C1015, C1020, C102B, C1011, C101C, C1027, C1032, C1014, C101F, C102A, C1035, C1041, C1042, C1043, C1044, C1219, C2205, C123C, and C2204 also set?
Carry out the diagnosis for the DTC that is set (Refer to ).
Go to Step 4.
 
STEP 4. Using scan tool (M.U.T.-IIISE), check data list.
Check the following data list. (Refer to ).
  • Item 06: Yaw rate sensor
  • Item 08: Lateral G sensor
  • Item 09: G sensor
Is the check result normal?
Go to Step 5.
Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ).
 
STEP 5. Check of steering wheel sensor installation status.
Check that the steering wheel sensor is installed correctly.
Is the check result normal?
Go to Step 6.
Install the steering wheel sensor correctly (Refer to ).
 
STEP 6. Wheel alignment check.
Refer to GROUP 33 -On-vehicle Service/Front wheel alignment check .
Is the check result normal?
Go to Step 7.
Repair it.
 
STEP 7. Using scan tool (M.U.T.-IIISE), check data list.
Check the following data list (Refer to ).
  • Item 05: Steering angle sensor
Is the check result normal?
Go to Step 8.
Replace the steering wheel sensor (Refer to ).
 
STEP 8. Check whether the DTC is set again.
(1) Erase the DTC.
(2) Turn the steering wheel to either right or left at 20 km/h (12 mph) or higher.
noteThe ASC warning/operation light and the ASC OFF light may remain on until the vehicle speed reaches approx. 10 km/h (6 mph), then the steering wheel is turned to either right or left.
Is DTC C123B set?
Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ).
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ).