Code No. C1381: G-sensor (output error, seizure)

caution

If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Diagnose the CAN bus lines before the diagnosis codes (Refer to GROUP 54C, CAN bus-line diagnostic flow

OPERATION

The G and yaw rate sensor detects longitudinal, lateral, and oblique G for the vehicle, and sends them to ASTC-ECU via the CAN bus line.

DIAGNOSIS CODE SET CONDITION

This diagnosis code is set in the following cases:

The input voltage of ASTC-ECU is normal, but the G-sensor output is more than specified value when the vehicle is stopped.
The input voltage of ASTC-ECU is normal, but the G-sensor outputs nothing during the time form the vehicle driving at the vehicle speed of 30 km/h or more to the vehicle stop.
The input voltage of ASTC-ECU is normal, but the acceleration output when the vehicle is driving at the speed of 10 km/h or more is abnormal.

PROBABLE CAUSES

The most likely causes for these diagnosis codes to set are:

Malfunction of G and yaw rate sensor
Damaged wiring harness or connector
Malfunction of the hydraulic unit assembly (integrated with ASTC-ECU)

DIAGNOSIS

STEP 1. M.U.T.-III CAN bus diagnostics.

caution

Before connecting or disconnecting the M.U.T.-III, turn the ignition switch to the "LOCK" (OFF) position.

(1)Connect M.U.T.-III to the 16-pin diagnosis connector.
(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.

Q. Is the check result?

Go to Step 3.

Repair the CAN bus line (Refer to GROUP 54C, CAN bus line Diagnostic flow

). Then go to Step 2.

STEP 2. Check whether the diagnosis code is reset.

caution

Before connecting or disconnecting the M.U.T.-III, turn the ignition switch to the "LOCK" (OFF) position.

(1)Turn the ignition switch to the "ON" position.
(2)Erase the diagnosis code.
(3)Drive the vehicle at 5 km/h or more for 5 seconds or more.
(4)Turn the ignition switch to the "LOCK" (OFF) position.
(5)Turn the ignition switch to the "ON" position.
(6)Check if the diagnosis code is set.
(7)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is code No.C1381 set?

Replace the G and yaw rate sensor.Then go to Step 3.

The procedure is complete.

STEP 3. Check whether the diagnosis code is reset.

Check again if the diagnosis code is set.
(1)Turn the ignition switch to the "ON" position.
(2)Erase the diagnosis code.
(3)Drive the vehicle at 5 km/h or more for 5 seconds or more.
(4)Turn the ignition switch to the "LOCK" (OFF) position.
(5)Turn the ignition switch to the "ON" position.
(6)Check if the diagnosis code is set.
(7)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is code No.C1381 set?

Replace the hydraulic unit assembly (integrated with ASTC-ECU). Then go to Step 4.

It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction

STEP 4. Check whether the diagnosis code is reset.

Q. Is code No.C1381 set?

Go to Step 1.

The procedure is complete.