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DTC U0415: ASC CAN data error
 
 
caution
  • If there is any problem in the CAN bus lines, an incorrect DTC may be stored. 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 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 stores 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.
    noteSNA (Signal not available)
 
 
TROUBLESHOOTING HINTS
Current trouble
  • Wiring harness or connector failure between ASC-ECU and the stoplight switch
  • Malfunction of the ABS sensor
  • Malfunction of the stoplight switch
  • ASC-ECU malfunction
  • AWD-ECU malfunction
Past trouble
  • Refer to "How to treat past trouble" (GROUP 00 - How to Use Troubleshooting/How to Treat Past Trouble ) for proceeding the diagnostics.
 
 
DIAGNOSIS
STEP 1. Scan tool MB991958 CAN bus diagnostics
Use scan tool MB991958 to diagnose the CAN bus lines.
Is the check result normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting/CAN Bus Diagnostics Table ). Then go to Step 2.
 
STEP 2. Scan tool MB991958 data list
Check the following data list (Refer to ).
  • Item 07: CAN data (ABS/A.S.C.)
  • Item 16: FL wheel speed sensor
  • Item 17: FR wheel speed sensor
  • Item 18: RL wheel speed sensor
  • Item 19: RR wheel speed sensor
Is the check result normal?
Go to Step 3.
Troubleshoot the ASC system (Refer to GROUP 35C - Troubleshooting/DTC Chart ). Then go to Step 3.
 
STEP 3. Check whether the DTC is stored again.
(1) Erase the DTC.
(2) Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(3) Check if the DTC is stored.
Is DTC U0415 stored?
Replace AWD-ECU (Refer to ). Then go to Step 4 .
The procedure is complete.
 
STEP 4. Check whether the DTC is stored again.
Is DTC U0415 stored?
Diagnose again from Step 1.
The procedure is complete.