Code No. U1417 Implausible Coding Data: 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

1. STEP 1. Using scan tool MB991958, diagnose the CAN bus line. 
   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.
   1. 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? 

      1. YES:  Go to Step 2.
      2. NO:  Repair the CAN bus line (Refer to DIAGNOSIS ).
         Fig 1: Connecting Scan Tool To Data Link Connector

         Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2. 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? 

   1. YES (DTC is set to ETACS-ECU.):  Troubleshoot the ETACS (Refer to DIAGNOSIS ).
   2. YES (DTC is set to the engine control module.):  Troubleshoot the MFI system (Refer to DIAGNOSIS ).
   3. NO:  Go to Step 3.
3. STEP 3. Check part number of ETACS-ECU. 

   Check the part number of ETACS-ECU.

   OK: 8637A313 

   Q: Is the check result normal? 

   1. YES:  Go to Step 4.
   2. NO:  Replace ETACS-ECU.
4. STEP 4. Check part number of KOS-ECU. 

   Check the part number of KOS-ECU.

   OK: 8637A305 

   Q: Is the check result normal? 

   1. YES:  Go to Step 5.
   2. NO:  Replace KOS-ECU and register the ID codes (Refer to ID CODES REGISTRATION JUDGMENT TABLE  ).
5. STEP 5. Recheck for diagnostic trouble code. 

   Check again if the DTC is set to the KOS-ECU.

   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? 

      1. YES:  Replace KOS-ECU and register the ID codes (Refer to ID CODES REGISTRATION JUDGMENT TABLE  ).
      2. NO:  The trouble can be an intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).