Wireless Control Module (WCM)

DTC U1412: Implausible vehicle speed signal received

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 Diagnostics Chart).

TPMS DTC SET CONDITION

WCM receives the wheel speed information from ASC-ECU via the CAN-bus line. If WCM cannot receive the information about the wheel speed sensor from ASC-ECU, this code is set.

TROUBLESHOOTING HINTS

The most likely causes for this DTC to set are:

- Damaged wiring harness and connector

- Malfunction of ASC-ECU

- Malfunction of WCM

- Malfunction of ETACS-ECU

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. M.U.T.-III CAN bus diagnostics

Use scan tool to diagnose the CAN bus lines.

Q. Is the check result normal?

YES Go to Step 3.
NO Repair the CAN bus lines CAN Bus Diagnostics Chart).
On completion, go to Step 2.
STEP 2. Diagnostic trouble code recheck after resetting CAN bus lines

(1)Turn the ignition switch to the "LOCK" (OFF) position.

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

(3)Check if the DTC is set.

(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the DTC U1412 set?

YES Go to Step 3.
NO The procedure is complete.
STEP 3. Check for other diagnostic trouble code.

Check if the diagnostic trouble code is set from ASC-ECU Active Stability Control System (ASC)).

Q. Is the check result normal?

YES Go to Step 4.
NO Carry out the troubleshooting for ASC-ECU Active Stability Control System (ASC)). Then go to Step 5.
STEP 4. Check for other diagnostic trouble code.

Check if the diagnostic trouble code is set from ETACS-ECU Electronic Time and Alarm Control System (ETACS)).

Q. Is the check result normal?

YES Replace the WCM and register ID codes (Refer to ID registration procedure manual
- ID codes registration judgement table). Then go to Step 5.
NO Carry out the troubleshooting Electronic Time and Alarm Control System (ETACS)). Then go to Step 5.
STEP 5. Recheck for diagnostic trouble code.

Check again if the DTC is set.

(1)Turn the ignition switch to the "LOCK" (OFF) position.

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

(3)Check if the DTC is set.

(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the DTC U1412 reset?

YES Start over at Step 1.
NO The procedure is complete.