Code No.C1223: G and Yaw Rate Sensor (Active Check Error)

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 code (Refer to GROUP 54C, CAN bus-line diagnostic flow

OPERATION

The G and yaw rate sensor is energized by the ignition switch (IG1) and the G and yaw rate sensor terminal 1.
The G and yaw rate sensor output signal is sent to the ASTC-ECU via the private CAN bus line.

DIAGNOSIS CODE SET CONDITION

The diagnosis code is set if the first G and yaw rate sensor check is not completed within the specified time although ASTC-ECU input voltage is normal when the ignition switch is turned ON.

PROBABLE CAUSES

Malfunction of the G and yaw rate sensor
Damaged wiring harness or connector
Malfunction of the hydraulic unit (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 normal?

Replace the G and yaw rate sensor (Refer to

). Then go to Step 2.

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

). Then go to Step 3.

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)Turn the ignition switch to the "LOCK" (OFF) position.
(4)Turn the ignition switch to the "ON" position.
(5)Check if the diagnosis code is set.
(6)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is code No.C1223 set?

Replace the hydraulic unit (integrated with ASTC-ECU) <Refer to

>. Then go to Step 3.

The procedure is complete.

STEP 3. Recheck for diagnosis code.

Check again if the diagnosis code is set.
(1)Turn the ignition switch to the "ON" position.
(2)Erase the diagnosis code.
(3)Turn the ignition switch to the "LOCK" (OFF) position.
(4)Turn the ignition switch to the "ON" position.
(5)Check if the diagnosis code is set.
(6)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is code No.C1223 set?

Go to Step 1.

The procedure is complete.