Electronic Control AWD

DTC U0415: ABS CAN data error

CAUTION:

- If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, always diagnose the CAN bus lines.

- Before replacing the ECU, ensure that the communication circuit is normal.

OPERATION

AWD-ECU receives the data (such as wheel speed sensor signal) from ABS/ASC-ECU via the CAN bus lines. If it detects malfunction of the wheel speed signal, it interrupts the system.

DTC SET CONDITIONS

If the following conditions are met when the system is in operation (always), AWD-ECU gradually switches the control from AWD to FWD, flashes the AWD/LOCK indicators alternately, and sets the DTC U0415.

- IG1 voltage: 10 V or more

- If the received wheel speed of one or more wheels reaches or exceeds the threshold value of 4000 r/min, or the received wheel speed of one or more wheels is SNA.
NOTE:
SNA (Signal not available)

TROUBLESHOOTING HINTS

Current trouble

- Wiring harness or connector failure between ABS/ASC-ECU and the stoplight switch

- Malfunction of the ABS sensor

- Malfunction of the stoplight switch

- ABS/ASC-ECU malfunction

- AWD-ECU malfunction
Past trouble

- Refer to How to Use Troubleshooting - How to Treat Past Trouble How to Treat Past Trouble for proceeding the diagnostics.

DIAGNOSIS

Required Special Tools:

- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicle Communication Interface

- MB991827: M.U.T.-III USB Cable

- MB991910: M.U.T.-III Main Harness A

STEP 1. Scan tool MB991958 CAN bus diagnostics

Use scan tool MB991958 to diagnose the CAN bus lines.

Q. Is the check result normal?

YES Go to Step 2.
NO Repair the CAN bus line CAN Bus Diagnostics Chart). Then go to Step 2.
STEP 2. Scan tool MB991958 data list

Check the following data list (Refer to Data List Reference Table).

- Item 07: CAN system (ABS/ASC)

- Item 16: FL wheel speed sensor

- Item 17: FR wheel speed sensor

- Item 18: RL wheel speed sensor

- Item 19: RR wheel speed sensor

Q. Is the check result normal?

YES Go to Step 3.
NO Troubleshoot the ABS system Anti-Lock Braking System (ABS) [Vehicles with ABS]), the ASC system
Active Stability Control System (ASC) [Vehicles with ASC]). Then go to Step 3 .
STEP 3. Check whether the DTC is reset.

(1)Erase the DTC.

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

(3)Check if the DTC is set.

Q. Is the DTC U0415 set?

YES Replace AWD-ECU (Refer to Electronic Control AWD). Then go to Step 4 .
NO The procedure is complete.
STEP 4. Check whether the DTC is reset.

Q. Is the DTC U0415 set?

YES Diagnose again from Step 1.
NO The procedure is complete.