35C-DTC C1390 LATERAL G SENSOR ACTIVE CHECK

Code No. C1390 Lateral G sensor active check

caution

If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be stored. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C, Trouble code diagnosis ).
Whenever ECU is replaced, ensure that the CAN bus lines are normal.
When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor and the G and yaw rate sensor (Refer to and ).

OPERATION

The G and yaw rate sensor output signal is sent to the ASC-ECU.

DIAGNOSTIC TROUBLE CODE SET CONDITIONS

The ASC-ECU monitors the G and yaw rate sensor output signal, and when the value sent from the G and yaw rate sensor is out of a predetermined range, the ECU determines that the trouble occurs and stores the diagnostic trouble code.

PROBABLE CAUSES

Malfunction of ASC-ECU

note	When the vehicle is placed on a high-speed turning table, this diagnostic trouble code will also be stored.

DIAGNOSIS

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines.

Use the scan tool MB991958 to diagnose the CAN bus lines.

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. Diagnostic trouble code recheck after resetting CAN bus lines

Is diagnostic trouble code No. C1390 stored?

Go to Step 3

This diagnosis is complete.

STEP 3. Using scan tool MB991958, check data list

Check the following service data.(Refer to

Item No. 08: Lateral G-sensor

Is the check result normal?

Go to Step 4

STEP 4. Check whether the diagnostic trouble code is stored again.

(1) Erase the stored diagnostic trouble code.

(2) Ignition switch: "LOCK" (OFF) to "ON"

(3) Start the engine.

Is diagnostic trouble code No. C1390 stored?

Replace the hydraulic unit (integrated with ASC-ECU). (Refer to

The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction