ASC

DTC U1417: Variant coding value invalid (includes faulty installation)

CAUTION:
^ If diagnostic trouble code U1417 is set in ASC-ECU, always diagnose the CAN bus lines. If there is any fault in the CAN bus lines, an incorrect diagnostic trouble code may be set. In this case, the set diagnostic trouble code is not highly reliable.
^ Before replacing the ECU, ensure that the communication circuit is normal.
^ When the diagnostic trouble code U1417 is set in ASC-ECU, the diagnostic trouble code may also be set in ETACS-ECU. When the diagnostic trouble code is set in ETACS-ECU, carry out the diagnosis of the diagnostic trouble code for ETACS-ECU first.

CIRCUIT OPERATION
ASC-ECU receives the vehicle information stored in the ETACSECU via CAN bus lines.

DTC SET CONDITIONS
ASC-ECU communicates with ETACS-ECU via CAN bus lines.

This diagnostic trouble code is set when the vehicle information received from the ETACS-ECU is invalid.

PROBABLE CAUSES
^ Malfunction of ETACS-ECU
^ Engine ECU malfunction
^ ETACS-ECUs have been interchanged between two vehicles.
^ ASC-ECU malfunction
^ ASC-ECUs have been interchanged between two vehicles.

DIAGNOSIS

Required Special Tools:
^ MB991958: Scan Tool (M.U.T.-III Sub Assembly)
^ MB991824: Vehicle Communication Interface (V.C.I.)
^ MB991827: M.U.T.-III USB Cable
^ MB991910: M.U.T.-III Main Harness A

STEP 1. M.U.T.-III CAN bus diagnostics
Use scan tool to diagnose the CAN bus lines.
Q: Is the check result normal?
YES: Go to Step 3.
NO: Repair the CAN bus lines. On completion, go to Step 2.

STEP 2. Diagnostic trouble code recheck after resetting CAN bus lines
Q: Is DTC U1417 set?
YES: Go to Step 3.
NO: The procedure is complete.

STEP 3. M.U.T.-III diagnostic trouble code
Use scan tool to check diagnostic trouble code C121C is set or not.
Q: Is DTC C121C set?
YES: Troubleshoot for the relevant diagnostic trouble code.
NO: Go to Step 4.

STEP 4. M.U.T.-III other system diagnostic trouble code
Use scan tool to check whether the ETACS-ECU-related or engine ECU-related diagnostic trouble code is set or not.
Q: Is any DTC set?
YES: Troubleshoot for the relevant diagnostic trouble code.
NO: Go to Step 5.

STEP 5. Check part number of ETACS-ECU
Check the part number of ETACS-ECU.

OK: 8637A213

Q: Is the check result normal?
YES: Go to Step 6.
NO: Replace ETACS-ECU.

STEP 6. Check part number of ASC-ECU
Check the part number of ASC-ECU.

OK: 4670A251

Q: Is the check result normal?
YES: Go to Step 7.
NO: Replace the ASC-ECU.

STEP 7. Check whether the diagnostic trouble code is reset.
Q: Is DTC U1417 set?
YES: Replace the ASC-ECU.
NO: The procedure is complete.