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 the 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 the 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.
Go to Step 3
Repair the CAN bus line (Refer to GROUP 54C - CAN Bus Diagnostics Table 
). Then go to Step 2.