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Home >> Mitsubishi >> 2014 >> Lancer ES Sportback >> Repair and Diagnosis >> External Pages >> Different car >> Section 35 (Controller Area Network (Can) Diagnosis) >> Diagnosis >> Can Bus Diagnostics >> Diagnostic Item 20: Diagnose when the scan tool cannot receive the data sent by ACC/FCM-ECU. < vehicles with ACC > >> Diagnosis

Diagnostic Item 20: Diagnose when the scan tool cannot receive the data sent by ACC/FCM-ECU. < vehicles with ACC >: 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.
  1. STEP 1. Connector check: joint connector (CAN2) and ACC/FCM-ECU connector 
    CAUTION: The strand end of the twist wire should be within 10 cm from the connector. For details refer to SERVICE PRECAUTIONS  .

    When checking the joint connector, ensure that its wiring harness side and its short pins are not damaged.

    Q: Is the check result normal? 

    1. YES:  Go to Step 2.
    2. NO:  Repair the defective connector. Replace the joint connector as necessary.
  2. STEP 2. Resistance measurement at joint connector (CAN2) and ACC/FCM-ECU connector. 
    CAUTION: A digital multimeter should be used. For details refer to SERVICE PRECAUTIONS  .
    CAUTION: The test wiring harness should be used. For details refer to SERVICE PRECAUTIONS  .
    1. Disconnect joint connector (CAN2) and the ACC/FCM-ECU connector, and measure at the wiring harness side.
    2. Turn the ignition switch to the LOCK (OFF) position.
      CAUTION: When measuring the resistance, disconnect the negative battery terminal. For details refer to SERVICE PRECAUTIONS  .
    3. Ensure that the negative battery terminal is disconnected.
    4. Continuity between joint connector (CAN2) terminal No.9 and ACC/FCM-ECU connector terminal No.2

      OK: Continuity (2 ohms or less) 

    5. Continuity between joint connector (CAN2) terminal No.20 and ACC/FCM-ECU connector terminal No.7

      OK: Continuity (2 ohms or less) 

      CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to SERVICE PRECAUTIONS  .

    Q: Is the check result normal? 

    1. YES:  < All the resistances measure 2 ohms or less > Power supply to the ACC/FCM-ECU may be suspected. Diagnose the ACC. Refer to CHECK CHART FOR DIAGNOSTIC TROUBLE CODES TABLE .
    2. NO:  < Either or all of the resistances measure more than 2 ohms > Repair the wiring harness between joint connector (CAN2) and the ACC/FCM-ECU connector.
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