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Home >> Infiniti >> 2005 >> Q45 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P1211 To P2138 >> DTC P1780: Shift Change Signal >> Diagnostic Procedure

Diagnostic Procedure

  1. CHECK DTC WITH TCM 

    Check DTC with TCM. Refer to "ON BOARD DIAGNOSTIC (OBD) SYSTEM ".

    OK or NG 

    1. OK: GO TO 2.
    2. NG: Perform trouble shooting relevant to DTC indicated.
  2. CHECK TCM FUNCTION 

    Refer to "TROUBLE DIAGNOSIS ".

    OK or NG 

    1. OK: GO TO 3.
    2. NG: Replace TCM. Refer to "PRECAUTIONS ".
  3. REPLACE ECM 
    1. Replace ECM.
    2. Perform initialization of IVIS (NATS) system and registration of all IVIS (NATS) ignition key IDs. Refer to "ECM RE-COMMUNICATING FUNCTION ".
    3. Perform "VIN REGISTRATION ".
    4. Perform "ACCELERATOR PEDAL RELEASED POSITION LEARNING ".
    5. Perform "THROTTLE VALVE CLOSED POSITION LEARNING ".
    6. Perform "IDLE AIR VOLUME LEARNING ".
      1. INSPECTION END 
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