Code No. C1392: INCOMP.learn (Longitudinal G)


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 - Troubleshooting ).
  • Whenever ECU is replaced, ensure that the CAN bus lines are normal.
  • When the hydraulic unit assembly (integrated with ASTC-ECU) is replaced, always carry out the calibration of the steering wheel sensor and the G sensor (Refer to ).

OPERATION


The ASTC-ECU monitors the integrated G sensor.

DIAGNOSIS CODE SET CONDITIONS


The ASTC-ECU will set a diagnosis code when the G sensor has not been calibrated.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE

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 line (Refer to GROUP 54C - Troubleshooting ). On completion, go to Step 2.

STEP 2. Diagnosis code recheck after resetting CAN bus lines

Q. Is diagnosis code No. C1392 set?
Go to Step 3.
This diagnosis is complete.

STEP 3. G sensor calibration
Perform calibration of G sensor (Refer to ).

Q. Is the check result normal?
Go to Step 4.
Calibrate the G sensor (Refer to ). Then go to Step 4.

STEP 4. Check whether the diagnosis code is set again.
(1)Erase the set diagnosis code.
(2)Ignition switch: "LOCK" (OFF) to "ON"
(3)Start the engine.

Q. Is diagnosis code No. C1392 set?
Replace the hydraulic unit assembly (integrated with ASTC-ECU) (Refer to ).
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).