Code No.C1381: G-sensor malfunction (abnormal seizure or output error) <4WD>


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 ).
  • Before replacing the ECU, ensure that the communication circuit is normal.

OPERATION
The G-sensor detects the acceleration level in the forward/reverse direction of the vehicle, converts the signals into voltage signals and then sends that signal to the ABS-ECU.

DIAGNOSIS CODE SET CONDITIONS
This diagnosis code will be set under the cases below.

  • With diagnosis codes No. C1365, C1382, and C1383 being not set, the output value of the G-sensor does not change.
  • With diagnosis codes No. C1365, C1382, and C1383 being not set, the acceleration calculated from the G-sensor and the acceleration calculated from the vehicle speed are not equal.

PROBABLE CAUSES

  • Malfunction of the G-sensor
  • Malfunction of the ABS-ECU

DIAGNOSIS

STEP 1. M.U.T.-III CAN bus diagnostics.
Use 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 - CAN Bus Diagnostics Table ). Then go to Step 2.

STEP 2. Diagnosis code recheck after resetting CAN bus lines
(1)Erase the diagnosis code.
(2)Drive the vehicle at 30 km/h or more.
note The ABS warning lamp does not turn OFF in some cases unless the vehicle runs at 30 km/h or higher.

Q. Is diagnosis code No.C1381 set?
Go to Step 3
The procedure is complete.

STEP 3. Check the G-sensor.
Refer to .

Q. Is the check result normal?
Go to Step 4
Replace the G-sensor (Refer to .) Then go to Step 5.

STEP 4. Diagnosis code recheck
(1)Erase the diagnosis code.
(2)Drive the vehicle at 30 km/h or more.
note The ABS warning lamp does not turn OFF in some cases unless the vehicle runs at 30 km/h or higher.

Q. Is diagnosis code No.C1381 set?
Replace the hydraulic unit (integrated with ABS-ECU) (Refer to .) Then go to Step 5.
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction .)

STEP 5. Diagnosis code recheck
(1)Erase the diagnosis code.
(2)Drive the vehicle at 30 km/h or more.
note The ABS warning lamp does not turn OFF in some cases unless the vehicle runs at 30 km/h or higher.

Q. Is diagnosis code No.C1381 set?
Return to Step 1.
This diagnosis is complete.