DTC U1415: Coding Not Completed: Diagnosis

Required Special Tools:

MB991223: Harness Set
MB992006: Extra Fine Probe
MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: 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
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?
  - YES: Go to Step 2.
  - NO: Repair the CAN bus line. (Refer to DIAGNOSIS ).
    
    Fig 1: Connecting Special Tool To Data Link Connector
    Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 2. Using scan tool MB991958 read the ETACS-ECU diagnostic trouble code.
Check whether an ETACS DTC.
1. Turn the ignition switch to the "ON" position.
2. Check for the DTC related to the ETACS-ECU.
3. Turn the ignition switch to the "LOCK" (OFF) position.
  Q: Is the DTC set?
  - YES: Diagnose the ETACS-ECU (Refer to DIAGNOSTIC TROUBLE CODE ).
  - NO: Go to Step 3.
STEP 3. Using scan tool MB991958, check for any diagnostic trouble code.
Check if a DTC, which relates to CAN communication-linked systems below, is set.
- WCM <vehicles with WCM>
  B2204: Coding data unmatched
- KOS <vehicles with KOS>
  B2204: Coding data unmatched
1. Turn the ignition switch to the "ON" position.
2. Check for a DTC related to the relevant system.
3. Turn the ignition switch to the "LOCK" (OFF) position.
  Q: Is the DTC set?
  - YES: Go to Step 5.
  - NO: Go to Step 4.
STEP 4. Recheck for diagnostic trouble code.
Check again if the DTC is set.
1. Turn the ignition switch to the "ON" position.
2. Check if the DTC is set.
3. Turn the ignition switch to the "LOCK" (OFF) position.
  Q: Is the DTC set?
  - YES: Replace the ETACS-ECU. On completion, check that the DTC is not reset.
  - NO: A poor connection, open circuit or other intermittent malfunction is present in the lines between the ETACS-ECU and the A/C-ECU or heater control unit <vehicles without A/C> (Refer to HARNESS CONNECTOR INSPECTION ).
STEP 5. Recheck for diagnostic trouble code.
Check again if the DTC is set.
1. Turn the ignition switch to the "ON" position.
2. Check if the DTC is set.
3. Turn the ignition switch to the "LOCK" (OFF) position.
  Q: Is the DTC set?
  - YES: Replace the A/C-ECU or heater control unit <vehicles without A/C>. On completion, check that the DTC is not reset.
  - NO: A poor connection, open circuit or other intermittent malfunction is present in the lines between the ETACS-ECU and the A/C-ECU or heater control unit <vehicles without A/C> (Refer to HARNESS CONNECTOR INSPECTION ).