Active Stability Control System (ASC)

DTC U1415 Variant coding not implemented

CAUTION:

- If there is any problem in the CAN bus lines, an incorrect DTC 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 DTC U1415 is set in ASC-ECU, the DTC may also be set in ETACS-ECU. When the DTC is set in ETACS-ECU, carry out the diagnosis of the DTC 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 Active Stability Control System (ASC) , Active Stability Control System (ASC) and Active Stability Control System (ASC) ).

OPERATION

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

DTC SET CONDITIONS

This DTC is set when the variant coding for ETACS-ECU has not been implemented.

PROBABLE CAUSES

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

DIAGNOSIS

Required Special Tools:

- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A

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

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, check the other system DTC.

Use scan tool to check that the DTC B222C is set in the ETACS-ECU.

Q. Is the DTC set?

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

(1)Erase the DTC.

(2)Turn the ignition switch to the "OFF" position.

(3)Turn the ignition switch to the "ON" position.

(4)Check that the ABS warning light goes out.
NOTE:
If the DTC U1415 is not deleted, the ABS warning light keeps illuminating.

Q. Is DTC U1415 set?

YES Replace the hydraulic unit (integrated with ASC-ECU) (Refer to Active Stability Control System (ASC)), 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)Turn the ignition switch to the "OFF" position.

(3)Turn the ignition switch to the "ON" position.

(4)Check that the ABS warning light goes out when the ignition switch is turned to the "ON" position.
NOTE:
If the DTC U1415 is not deleted, the ABS warning light keeps illuminating.

Q. Is DTC U1415 set?

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