Code No. U0415: ABS/ASC (CAN
message)
caution |
- 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
).
- Whenever ECU is replaced, ensure that the CAN bus lines are normal.
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OPERATION
ASTC-related signals are sent or received between the electric parking brake ECU and the
ASTC-ECU via CAN bus lines.
DIAGNOSIS CODE SET CONDITIONS
The diagnosis code will be set under any of the following conditions:
- An invalid G sensor signal persists for at least one second.
- An abnormal G sensor signal persists for at least one second.
- An abnormal wheel speed sensor signal persists for at least one second.
PROBABLE CAUSES
- Malfunction of ASTC system (wheel speed sensor)
- 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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Check if the diagnosis code is set in the ASTC-ECU (Refer to GROUP 35C - Diagnosis
Code Chart ).
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Q.
Is the diagnosis code set?
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Troubleshoot the ASTC-ECU diagnosis code (Refer to GROUP 35C - Diagnosis
Code Chart ).
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Go to Step 4.
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STEP 4. 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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Replace the hydraulic unit assembly (integrated with ASTC-ECU) (Refer to GROUP
35C - Hydraulic Unit ).
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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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Replace the electric parking brake ECU (Refer to ).
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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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