U1428

DTC U1428: G and Yaw Rate Sensor Data Error

CAUTION:

- If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines.
- Whenever the ECU is replaced, ensure that the CAN bus lines are normal.
- Do not drop the G and yaw rate sensor or subject it to a shock.
- When G and yaw rate sensor is replaced, calibrate G and yaw rate sensor (refer to On-vehicle Service G and Yaw Rate Sensor Calibration ), and initialize the lateral/longitudinal acceleration correction amount stored in AWC-ECU. (Refer to item No.2: Lateral acceleration correction amount initialization, and No.3: Longitudinal acceleration correction amount initialization Actuator Test Reference Table .)

OPERATION

AWC-ECU communicates with the G and yaw rate sensor via the CAN bus lines.

DTC SET CONDITIONS

The code is set when abnormality is detected in the signal received from the G and yaw rate sensor.

PROBABLE CAUSES

- Malfunction of the CAN bus line (local)
- Malfunction of G and yaw rate sensor
- Malfunction of AWC-ECU

DIAGNOSTIC PROCEDURE

STEP 1. Scan tool CAN bus diagnostics

Using scan tool MB991958, diagnose the CAN bus lines.

Q. Is the check result normal?

YES Go to Step 2.
NO Repair the CAN bus lines. CAN Bus Diagnostics Chart.)
STEP 2. Scan tool diagnostic trouble code

Check if the AWC diagnostic trouble code No. U1003 is set.(Refer to Super All Wheel Control (S-AWC).)

Q. Is the DTC set?

YES Perform the relevant troubleshooting.
NO Go to Step 3.
STEP 3. Scan tool diagnostic trouble code

Check if the AWC diagnostic trouble code No. C123C, C1242, C2114, C2115, or C2204 is set.(Refer to Super All Wheel Control (S-AWC).)

Q. Is the DTC set?

YES Perform the relevant troubleshooting.
NO Go to Step 4.
STEP 4. Scan tool service data

Check the service data below.(Refer to Data List Reference Table.)

- Item No. 26: Yaw rate sensor
- Item No. 29: Lateral G sensor
- Item No. 31: Longitudinal G sensor

Q. Is the check result normal?

YES Go to Step 5.
NO Replace the G and yaw rate sensor. Service and Repair.) Then go to Step 6.
STEP 5. Check whether the DTC is reset.

Q. Is DTC No. U0428 set?

YES Replace the AWC-ECU.(Refer to Active Center Differential (ACD).) Then go to Step 6.
NO Intermittent malfunction. How to Cope With Intermittent Malfunctions.)
STEP 6. Check whether the DTC is reset.

Q. Is DTC No. U0428 set?

YES Return to Step 1.
NO This diagnosis is complete.