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Home >> Nissan-Datsun >> 2004 >> Altima S, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 896 (Continuously Variable Transmission (CVT)) >> DTC P1777 Step Motor - Circuit >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2007 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK INPUT SIGNALS 

    With CONSULT-II 

    1. Start engine.
    2. Select "SELECTION FROM MENU" in "DATA MONITOR" mode for "TRANSMISSION" with CONSULT-II.
    3. Start vehicle and read out the value of "STM STEP", "SMCOIL A", "SMCOIL B", "SMCOIL C", and "SMCOIL D".
    DISPLAY VALUE REFERENCE

    Item name Condition Display value (Approx.)
    STM STEP During driving -20 step - 190 step
    SMCOIL A Changes ON ←→ OFF.
    SMCOIL B
    SMCOIL C
    SMCOIL D
    Fig 1: CONSULT-II Display - DATA MONITOR
    G04916201Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO  4.

    NG: GO TO  2.

  2. CHECK HARNESS BETWEEN TCM AND STEP MOTOR 
    1. Turn ignition switch OFF.
    2. Disconnect CVT unit connector and TCM connector.
    3. Check continuity between TCM connector terminals and CVT unit harness connector terminals.
      TCM AND STEP MOTOR

      Item Connector Terminal Continuity
      TCM F56 11 Yes
      CVT unit harness connector F30 6
      TCM F56 12 Yes
      CVT unit harness connector F30 7
      TCM F56 20 Yes
      CVT unit harness connector F30 8
      TCM F56 21 Yes
      CVT unit harness connector F30 9
      Fig 2: Checking Continuity Between TCM Connector Terminal And CVT Unit Harness Connector Terminals
      G04916202Courtesy of NISSAN MOTOR CO., U.S.A.
    4. If OK, check harness for short to ground and short to power.
    5. If OK, check continuity between body ground and CVT assembly.
    6. Reinstall any part removed.

    OK or NG 

    OK: GO TO  3.

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

  3. CHECK STEP MOTOR 

    Check step motor. Refer to "COMPONENT INSPECTION ."

    OK or NG 

    OK: GO TO  4.

    NG: Repair or replace damaged parts.

  4. CHECK DTC 

    Perform "DTC Confirmation Procedure". Refer to "DTC CONFIRMATION PROCEDURE ".

    OK or NG 

    OK: INSPECTION END 

    NG: GO TO  5.

  5. CHECK TCM 
    1. Check TCM input/output signals. Refer to "TCM INPUT/OUTPUT SIGNAL REFERENCE VALUES ".
    2. If NG, re-check TCM pin terminals for damage or loose connection with harness connector.

    OK or NG 

    OK: INSPECTION END 

    NG: Repair or replace damaged parts.

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