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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 stored. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C, Trouble code diagnosis ).
 
 
TPMS DTC SET CONDITION
KOS-ECU receives the wheel speed information from ASC-ECU via the CAN-bus line. If KOS-ECU cannot receive the information about the wheel speed sensor from ASC-ECU, this code is stored.
 
 
TROUBLESHOOTING HINTS
The most likely causes for this DTC to stored are:
  • Damaged wiring harness and connector
  • Malfunction of ASC-ECU
  • Malfunction of KOS-ECU
  • 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 power supply mode of the engine switch to the 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 power supply mode of the engine switch to ON.
(3) Diagnose the CAN bus line.
(4) Turn the power supply mode of the engine switch to OFF.
Is the CAN bus line found to be normal?
Go to Step 2.
Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics table ). On completion, go to Step 2.
 
STEP 2. Diagnostic trouble code recheck after resetting CAN bus lines
(1) Turn the power supply mode of the engine switch to OFF.
(2) Turn the power supply mode of the engine switch to ON.
(3) Check if the DTC is stored.
(4) Turn the power supply mode of the engine switch to OFF.
Is DTC U1412 stored?
Go to Step 3.
The procedure is complete.
 
STEP 3. Check for other diagnostic trouble code.
Check if the diagnostic trouble code is stored in the 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 stored in the ETACS-ECU (Refer to GROUP 54A - diagnostic trouble code chart ).
Is the check result normal?
Replace the KOS-ECU 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 stored.
(1) Turn the power supply mode of the engine switch to OFF.
(2) Turn the power supply mode of the engine switch to ON.
(3) Check if the DTC is stored.
(4) Turn the power supply mode of the engine switch to OFF.
Is DTC U1412 stored again?
Start over at Step 1.
The procedure is complete.