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Code No.U1417 Implausible coding data


caution
  • If diagnostic trouble code U1417 is set in WCM, 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 diagnostic trouble code U1417 is set in WCM, 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
WCM receives the vehicle information stored in the ETACS-ECU via CAN bus lines.

DTC SET CONDITIONS
WCM 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 control module malfunction
  • ETACS-ECUs have been interchanged between two vehicles.
  • WCM malfunction
  • External noise interference
  • WCMs 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. Using scan tool MB991958, diagnose the CAN bus line.

(1)
caution To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
Connect scan tool MB991958. 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.

Q. Is the CAN bus line found to be normal?

Go to Step 2.

Repair the CAN bus line. (Refer to GROUP 54C, Diagnosis ).

STEP 2. Using scan tool MB991958, read the other system diagnostic trouble code.
Check if DTC is set to the ETACS-ECU or engine control module.

Q. Is the DTC set?
YES (DTC is set to ETACS-ECU.) : Troubleshoot the ETACS. (Refer to GROUP 54A, Diagnosis .)
YES (DTC is set to the engine control module.) : Troubleshoot the MFI system. (Refer to GROUP 13A, Diagnosis <2.0-Non turbo> or GROUP 13B, Diagnosis <2.0-Turbo> or GROUP 13C, Diagnosis <2.4L Engine>.)
NO : Go to Step 3.

STEP 3. Check part number of ETACS-ECU
Check the part number of ETACS-ECU.
OK: 8637A465

Q. Is the check result normal?
Go to Step 4.
Replace ETACS-ECU.

STEP 4. Check part number of WCM
Check the part number of WCM.
OK: MN141352

Q. Is the check result normal?
Go to Step 5.
Replace WCM and register the ID codes. (Refer to .)

STEP 5. Recheck for diagnostic trouble code.
Check again if the DTC is set to the WCM.
(1)Erase the DTC.
(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3)Check if DTC is set.
(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the DTC set?
Replace WCM and register the ID codes. (Refer to .)
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).