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DTC U1412: Implausible vehicle speed signal received
 
 
cautionIf 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 (Refer to GROUP 54C, Trouble code diagnosis ).
 
 
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
STEP 1. Using scan tool MB991958, diagnose the CAN bus line
(1)
cautionTo prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
Connect scan tool MB991958. Refer to "How to connect the Scan Tool (M.U.T.-III) ."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the CAN bus line found to be normal?
Go to Step 3.
Repair the CAN bus line (Refer to GROUP 54C, Diagnosis ). 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.
Is the DTC U1412 set?
Go to Step 3.
The procedure is complete.
 
STEP 3. Check for other diagnostic trouble code.
Check if the diagnostic trouble code is set from ASC-ECU (Refer to GROUP 35C, Diagnostic Trouble Code Chart ).
Is the check result normal?
Go to Step 4.
Carry out the troubleshooting for ASC-ECU (Refer to GROUP 35C, Diagnostic Trouble Code Chart ). Then go to Step 5.
 
STEP 4. Check for other diagnostic trouble code.
Check if the diagnostic trouble code is set from ETACS-ECU (Refer to GROUP 54A - diagnostic trouble code chart ).
Is the check result normal?
Replace the WCM and register ID codes (Refer to ). Then go to Step 5.
Carry out the troubleshooting (Refer to GROUP 54A - diagnostic trouble code chart ). 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.
Is the DTC U1412 reset?
Start over at Step 1.
The procedure is complete.