[Previous][Next]
Code No. C1392 INCOMP.learn (Longitudinal G)
 
 
caution
  • If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C, Trouble code diagnosis ).
  • Whenever ECU is replaced, ensure that the CAN bus lines are normal.
  • When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor and the G and yaw rate sensor (Refer to and ).
 
 
OPERATION
The G and yaw rate sensor output signal is sent to the ASC-ECU.
 
 
DIAGNOSTIC TROUBLE CODE SET CONDITIONS
The ASC-ECU receives the information of the G and yaw rate sensor calibration from the G and yaw rate sensor. When this information indicates that the calibration is not performed, the ECU sets the diagnostic trouble code.
 
 
PROBABLE CAUSES
  • The G and yaw rate sensor calibration not executed
  • Malfunction of ASC-ECU
 
 
DIAGNOSIS
STEP 1. Using scan tool MB991958, diagnose the CAN bus lines.
Use the scan tool MB991958 to diagnose the CAN bus lines.
Is the check result normal?
Go to Step 3.
Repair the CAN bus line (Refer to GROUP 54C, Troubleshooting ). On completion, go to Step 2.
 
STEP 2. Diagnostic trouble code recheck after resetting CAN bus lines
Is diagnostic trouble code No. C1392 set?
Go to Step 3.
This diagnosis is complete.
 
STEP 3. G and yaw rate sensor calibration
Perform calibration of G and yaw rate sensor (Refer to ).
Is the check result normal?
Go to Step 4.
Calibrate the G and yaw rate sensor (Refer to ). Then go to Step 4.
 
STEP 4. Check whether the diagnostic trouble code is set again.
(1) Erase the set diagnostic trouble code.
(2) Ignition switch: "LOCK" (OFF) to "ON".
(3) Start the engine.
Is diagnostic trouble code No. C1392 set?
Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ).
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).