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Home >> Mitsubishi >> 2014 >> Lancer ES Sportback >> Repair and Diagnosis >> External Pages >> Different car >> Section 90 (Lane Departure Warning System (LDWS) - With Diagnostics) >> Diagnosis Function >> Symptom Procedures >> Inspection Procedure 1: Cannot communicate with LDW-ECU using the scan tool (M.U.T.-III) >> Diagnosis

Inspection Procedure 1: Cannot communicate with LDW-ECU using the scan tool (M.U.T.-III): Diagnosis

WARNING: This page is about a different car, the 2014 Mitsubishi Outlander. However, it is still accessible from the selected car via links, so may be relevant.

Required Special Tools: 

  1. STEP 1. Using scan tool (M.U.T.-III), diagnose the CAN bus line 
    CAUTION: To 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).
    1. 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.

    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 ).
  2. STEP 2. Voltage measurement at LDW-ECU connector (IG terminal). 
    1. Disconnect the connector, and measure at the wiring harness side.
    2. Check the voltage between the LDW-ECU connector (IG terminal) and ground.

      OK: The voltage should measure approximately 12 volts (battery positive voltage). 

    Q: Is the check result normal? 

    1. YES:  Go to Step 3.
    2. NO:  Repair the power supply circuit to LDW-ECU.
  3. STEP 3. Resistance measurement at LDW-ECU connector (GND terminal) 
    1. Disconnect the connector, and measure at the wiring harness side.
    2. Measure the resistance between the LDW-ECU connector (GND terminal) and ground.

      OK: The resistance should be 2 ohms or less 

    Q: Is the check result normal? 

    1. YES:  Go to  Step 5.
    2. NO:  Go to Step 4.
  4. STEP 4. Check of open circuit in GND line between LDW-ECU connector and ground. 

    Q: Is the check result normal? 

    1. YES:  Go to Step 5.
    2. NO:  Repair the ground circuit to LDW-ECU.
  5. STEP 5. Retest the system 

    Check if scan tool (M.U.T.-III) can communicate with LDW-ECU.

    Q: Is the check result normal? 

    1. YES:  Intermittent malfunction is suspected (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
    2. NO:  Replace the LDW-ECU.
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