Active Stability Control System (ASC)

DTC U1415: Variant coding not completed

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 CAN Bus Line Diagnostics Flow ).
- Whenever ECU is replaced, ensure that the CAN bus lines are normal.
- When the diagnostic trouble code No.U1415 is set in ASC-ECU, the diagnostic trouble code may also be set in ETACS-ECU. When the diagnostic trouble code is set in ETACS-ECU, carry out the diagnosis of the diagnostic trouble code for ETACS-ECU first.
- When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to Testing and Inspection , Testing and Inspection and Testing and Inspection ).

CIRCUIT OPERATION

ASC-ECU receives the vehicle information stored in the ETACS-ECU via CAN bus lines.

DTC SET CONDITIONS

This diagnostic Trouble code is set when the variant coding for ETACS-ECU has not been completed.

PROBABLE CAUSES

- Variant coding for ETACS-ECU has not been implemented.
- ASC-ECU malfunction

DIAGNOSIS

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

Use scan tool to 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).
On completion, go to Step 4.
STEP 2. Using scan tool MB991958, read the ETACS-ECU DTC.

Use scan tool to check that the diagnostic trouble code B222C is set in the ETACS-ECU.

Q. Is any DTC set?

YES Troubleshoot the relevant diagnostic Trouble code, and then go to Step 4.
NO Go to Step 3.
STEP 3. Check whether the DTC is reset.

(1)Erase the DTC.

(2)Ignition switch "LOCK" (OFF)

(3)Ignition switch "ON"

(4)Check that the ABS warning light is extinguished.

Q. Is DTC U1415 set?

YES Replace the hydraulic unit (ASC-ECU) (Refer to Service and Repair), and then go to Step 4.
NO Intermittent malfunction How to Cope With Intermittent Malfunctions).
STEP 4. Check whether the DTC is reset.

(1)Erase the DTC.

(2)Ignition switch "LOCK" (OFF)

(3)Ignition switch "ON"

(4)Check that the ABS warning light is extinguished.

Q. Is DTC U1415 set?

YES Return to Step 1.
NO The procedure is complete.