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DTC U0417 EPB (CAN message)
 
 
cautionBefore replacing the ECU, ensure that the communication circuit is normal.
 
 
OPERATION
The ASC-ECU communicates with the electric parking brake ECU via CAN bus lines.
 
 
 
DTC SET CONDITIONS
The ASC-ECU will set the DTC when any of the following conditions is satisfied:
  • The system receives an implausible signal from the electric parking brake ECU.
  • The electric parking brake actuator fails.
  • The emergency brake does not work as the ASC system fails.
 
 
 
TROUBLESHOOTING HINTS
  • Wiring harness or connector failure of CAN bus line
  • Electric parking brake system fails
  • ASC system fails
 
 
 
 
DIAGNOSIS
STEP 1. Scan tool (M.U.T.-III) CAN bus diagnostics
(1)
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
Connect scan tool (M.U.T.-III). Refer to "How to connect the Scan Tool (M.U.T.-III) ."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the check result normal?
Go to Step 2
Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
 
STEP 2. Scan tool (M.U.T.-III) DTC
Use Scan tool (M.U.T.-III) to check that any DTC other than code No. U0417 is set in ASC-ECU.
Is the DTC set?
Troubleshoot for the relevant DTC (Refer to ).
Go to Step 3
 
STEP 3. Scan tool (M.U.T.-III) DTC of other system
Use Scan tool (M.U.T.-III) to check that any DTC other than code No. U0415 is set in electric parking brake ECU.
Is the DTC set?
Troubleshoot for the relevant DTC (Refer to GROUP 36 - Diagnostic Trouble Code Chart ).
Go to Step 4
 
STEP 4. Check whether the DTC is set again.
(1) Erase the DTC.
(2) Ignition switch "LOCK" (OFF)
(3) Ignition switch "ON"
Is DTC No.U0417 set?
Go to Step 5
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
 
STEP 5. Scan tool (M.U.T.-III) data list.
Check the data list (Refer to ).
 
Item No. Item nameNormal condition
164A.S.C. dynamic brake failNormal
Item No. Item nameNormal condition
164A.S.C. dynamic brake failNormal
OK: Normal condition is displayed.
Is the check result normal?
Go to Step 6
Replace the electric parking brake ECU (Refer to GROUP 36 - Electric Parking Brake ECU ).
 
STEP 6. Scan tool (M.U.T.-III) data list.
Check the data list (Refer to ).
 
Item No. Item nameNormal condition
161EPB fail stateNormal
Item No. Item nameNormal condition
161EPB fail stateNormal
OK: Normal condition is displayed.
Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
Replace the hydraulic unit assembly (integrated with ASC-ECU) (Refer to ).