Code No. U0415:
ABS/ASC (CAN message)
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- If there is any
problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis,
diagnose the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table
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- Whenever ECU is replaced, ensure that the CAN bus lines are normal.
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OPERATION
ASC-related signals are sent or received between the electric parking brake ECU and the
ASC-ECU via CAN bus lines.
DIAGNOSIS CODE SET CONDITIONS
The diagnosis code will be set under any of the following conditions:
- The system receives an invalid longitudinal G-sensor signal.
- The system detects an implausible longitudinal G-sensor signal.
- The system receives an invalid road wheel speed sensor signal.
- The system detects an implausible road wheel speed sensor signal.
- The system receives an invalid brake fluid pressure sensor signal.
- The system detects an implausible brake fluid pressure sensor signal.
- The system detects an implausible electric parking brake request signal.
- The system detects that the emergency brake function fails.
PROBABLE CAUSES
- The ASC system fails
- Power supply voltage
- Longitudinal G-sensor
- wheel speed sensor
- Brake fluid pressure sensor
- Emergency brake function
- The CAN bus line is defective (noise interference).
- Malfunction of the electric parking brake ECU
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STEP 1. M.U.T.-III CAN bus diagnosis
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Use the M.U.T.-III to diagnose the CAN bus lines.
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Q.
Is the check result normal?
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 Go to Step 3.
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 Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
On completion, go to Step 2.
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STEP 2. Diagnosis code recheck after resetting CAN bus lines
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Q.
Is diagnosis code No. U0415 set?
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Go to Step 3.
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This diagnosis is complete.
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STEP 3. Use M.U.T.-III to confirm a diagnosis code of other systems.
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Use M.U.T.-III to check that any diagnosis code other than code No. U0415 is set in electric
parking brake ECU.
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Q.
Is the diagnosis code set?
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Troubleshoot the relevant diagnosis code (Refer to ).
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Go to Step 4.
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STEP 4. Use M.U.T.-III to confirm a diagnosis code of other systems.
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Use M.U.T.-III to check that any diagnosis code other than code No. U0417 is set in ASC-ECU.
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Q.
Is the diagnosis code set?
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Troubleshoot the ASC-ECU diagnosis code (Refer to GROUP 35C - Diagnosis
Code Chart ).
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Go to Step 5.
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STEP 5. Check whether the diagnosis code is set again.
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Check again if the diagnosis code is set.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch to the LOCK (OFF) position.
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(3)Turn the ignition switch to the ON position.
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(4)Check if the diagnosis code is set.
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Q.
Is diagnosis code No. U0415 set?
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Go to Step 6.
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This diagnosis is complete.
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STEP 6. M.U.T.-III other system data list.
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Check the ASC-ECU data list (Refer to GROUP 35C - Data List Reference Table ).
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Item No.
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Item name
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Normal condition
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164
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A.S.C. dynamic brake fail
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Normal
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OK: Normal condition is displayed.
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Q.
Is the check result normal?
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Go to Step 7.
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Replace the electric parking brake ECU (Refer to ).
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STEP 7. M.U.T.-III other system data list.
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Check the ASC-ECU data list (Refer to GROUP 35C - Data List Reference Table ).
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Item No.
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Item name
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Normal condition
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161
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EPB fail state
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Normal
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OK: Normal condition is displayed.
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Q.
Is the check result normal?
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The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to Cope with Intermittent Malfunction).
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Replace the hydraulic unit assembly (integrated with ASC-ECU) (Refer to GROUP
35C - Hydraulic Unit).
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