Code No. U0415: ASC-ECU CAN Data Abnormality <Vehicles with ASC>


caution If diagnosis code U0415 is set from engine-ECU, surely perform CAN busline diagnosis.
caution Replace ECU after certainly confirming that the communication circuits are normal.

TROUBLE JUDGMENT


Check Conditions
  • After 5 seconds have passed since the ignition switch was turned to "ON" position.
  • While engine is running.
Judgement Criterion
  • When the communication error is judged between the engine-ECU and the ASC-ECU

COMMENTS ON TROUBLE SYMPTOM


Current malfunction
  • The failure is possibly caused by malfunction of the harness and connector in CAN busline between engine-ECU and ASC-ECU, by malfunction in ASC-ECU signals, in ASC-ECU itself, in engine-ECU.
Past malfunction
  • Proceed with troubleshooting focusing on malfunction of the harness and connector in CAN busline between engine-ECU and ASC-ECU and malfunction in ASC-ECU signals. For diagnosis procedure, refer to how to cope with past malfunctions. (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Treat Past Trouble ).
    note In the case of past malfunctions, M.U.T.-III CAN busline diagnosis cannot detect a malfunction even if there is a malfunction in CAN bus. Therefore, check CAN busline as in the case of response to intermittent malfunctions (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ). It is possible to narrow down areas with a high possibility of malfunctions from diagnosis codes set to each ECU that performs CAN communication (Refer to GROUP 54C - Explanation about the M.U.T.-III CAN Bus Diagnostics ).

FAIL-SAFE AND BACKUP FUNCTION



  • Torque requested by active stability control (ASC) is ignored.

PROBABLE CAUSES



  • Failed harness and connector
  • Signal failure input into engine-ECU sent from ASC-ECU through CAN communication
  • Failed ASC-ECU
  • Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnosis

  • Use M.U.T.-III to perform CAN busline diagnosis.

Q. Is the check result normal?
Go to Step 2 .
Repair CAN busline (Refer to GROUP 54C - Troubleshooting - CAN Bus Diagnostics Table ). After repairing CAN busline, go to Step 6 .

STEP 2. M.U.T.-III diagnosis code

  • Confirm the diagnosis code is set from the ASC-ECU.

Q. Is diagnosis code set?
Perform troubleshooting of the active stability control (ASC) system (Refer to GROUP 35C - Diagnosis Code Chart ).
Go to Step 3 .

STEP 3. M.U.T.-III diagnosis code
Check that the other ECU performing CAN communication with ASC-ECU sets diagnosis code No. U0415 [Refer to GROUP 54C - CAN Communication-related Diagnosis Code (U-code) Table ].

Q. Is diagnosis code set?
Go to Step 4 .
Go to Step 5 .

STEP 4. M.U.T.-III diagnosis code

  • Reconfirmation of diagnosis code.
Confirm again the diagnosis code is set from the engine-ECU.

  1. Erase the set diagnosis code.
  2. Ignition switch: LOCK (OFF) → ON
  3. Confirm whether the diagnosis code is set.

Q. Is diagnosis code set?
After replacing ASC-ECU, go to Step 6 .
Intermittent malfunction in CAN busline between engine-ECU and ASC-ECU (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).

STEP 5. M.U.T.-III diagnosis code

  • Reconfirmation of diagnosis code.
Confirm again the diagnosis code is set from the engine-ECU.

  1. Erase the set diagnosis code.
  2. Ignition switch: LOCK (OFF) → ON
  3. Confirm whether the diagnosis code is set.

Q. Is diagnosis code set?
After replacing engine-ECU, go to Step 6 .
Intermittent malfunction in CAN busline between engine-ECU and ASC-ECU (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).

STEP 6. M.U.T.-III diagnosis code

  • Reconfirmation of diagnosis code.
Confirm again the diagnosis code is set from the engine-ECU.

  1. Erase the set diagnosis code.
  2. Ignition switch: LOCK (OFF) → ON
  3. Confirm whether the diagnosis code is set.

Q. Is diagnosis code set?
Go to Step 1 .
Check end.