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Home >> Infiniti >> 2015 >> Q60 Base, 2D Convertible >> Repair and Diagnosis (Single Page) >> Engine Performance >> Testing & Diagnosis >> Engine Control System (Introduction & Diagnostic Trouble Codes (DTCS) U0101-P0021) (Convertible) >> DTC/Circuit Diagnosis >> DTC U1003: Can Comm Circuit >> Diagnosis Procedure >> Diagnostic Test
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Diagnostic Test

  1. CHECK VVEL CAN COMMUNICATION CIRCUIT

    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Disconnect VVEL control module harness connector.
    4. Check the continuity between ECM harness connector and VVEL control module harness connector.
      ECM VVEL control module Continuity
      Connector Terminal Connector Terminal
      F102 54 E15 24 Existed
      55 11
    5. Also check harness for short to ground and power.

    Is the inspection result normal?

    YES 

    GO TO STEP 3  .

    NO 

    GO TO STEP 2  .

  2. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connector E3, F1
    • Harness for open or short between ECM and VVEL control module

    Repair open circuit, short to ground or short to power in harness or connectors.

  3. CHECK INTERMITTENT INCIDENT

    Refer to INTERMITTENT INCIDENT .

    Is the inspection result normal?

    YES 

    GO TO STEP 4  .

    NO 

    Repair or replace.

  4. REPLACE VVEL CONTROL MODULE

    1. Replace VVEL control module. Refer to COMPONENT PARTS LOCATION .
    2. Go to SPECIAL REPAIR REQUIREMENT .

    GO TO STEP 5  .

  5. PERFORM DTC CONFIRMATION PROCEDURE

    1. Reconnect all harness connectors disconnected.
    2. Turn ignition switch ON.
    3. Erase DTC.
    4. Perform DTC Confirmation Procedure.

      See DTC LOGIC .

    5. Check DTC.

    Is the DTC U1003 displayed again?

    YES 

    GO TO STEP 6  .

    NO 

    INSPECTION END

  6. REPLACE ECM

    1. Replace ECM.
    2. Go to SPECIAL REPAIR REQUIREMENT .

    INSPECTION END

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