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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 P0745 Line Pressure Solenoid Valve >> 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 SIGNAL 

    With CONSULT-II 

    1. Start engine.
    2. Select "MAIN SIGNALS" in "DATA MONITOR" mode for "TRANSMISSION" with CONSULT-II.
    3. Read out the value of "ISOLT2".
    ISOLT2 DISPLAY VALUE

    Item name Condition Display value (Approx.)
    ISOLT2 Release your foot from the accelerator pedal. 0.8 A
    Press the accelerator pedal all the way down. 0.0 A
    Fig 1: CONSULT-II Display - DATA MONITOR
    G04916100Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II 

    1. Start engine.
    2. Check voltage between TCM connector terminal and ground.
      VOLTAGE REFERENCE CHART

      Name Connector Terminal Condition Voltage (Approx.)
      Pressure control solenoid valve A (Line pressure solenoid valve) F56 1 - ground Release your foot from the accelerator pedal. 5.0 - 7.0 V
      Press the accelerator pedal all the way down. 1.0 - 3.0 V
      Fig 2: Checking Voltage Between TCM Connector Terminal And Ground
      G04916113Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Turn ignition switch OFF.
    4. Disconnect TCM connector.
    5. Check if there is continuity between connector terminal and ground.

    OK or NG 

    OK: GO TO  5.

    NG: GO TO  2.

  2. CHECK PRESSURE CONTROL SOLENOID VALVE A (LINE PRESSURE SOLENOID VALVE) CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect TCM connector.
    3. Check resistance between TCM connector terminal and ground.
    PRESSURE CONTROL SOLENOID VALVE A (LINE PRESSURE SOLENOID VALVE) CIRCUIT

    Solenoid valve Connector Terminal Resistance (Approx.)
    Pressure control solenoid valve A (Line pressure solenoid valve) F56 1 - ground 3.0 - 9.0 Ω
    Fig 3: Checking Resistance Between TCM Connector Terminal And Ground
    G04916114Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO  5.

    NG: GO TO  3.

  3. CHECK VALVE RESISTANCE 
    1. Turn ignition switch OFF.
    2. Disconnect CVT unit harness connector.
    3. Check resistance between CVT unit harness connector terminal and ground.
      VALVE RESISTANCE

      Solenoid valve Connector Terminal Resistance (Approx.)
      Pressure control solenoid valve A (Line pressure solenoid valve) F30 2 - Ground 3.0 - 9.0 Ω
      Fig 4: Checking Resistance Between CVT Unit Harness Connector Terminal And Ground
      G04916115Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO  4.

    NG: Replace the transaxle assembly. Refer to "REMOVAL AND INSTALLATION ".

  4. CHECK HARNESS BETWEEN TCM AND PRESSURE CONTROL SOLENOID VALVE A (LINE PRESSURE SOLENOID VALVE) 
    1. Turn ignition switch OFF.
    2. Disconnect CVT unit harness connector and TCM connector.
    3. Check continuity between TCM connector terminal and CVT unit harness connector terminal.
      TCM AND PRESSURE CONTROL SOLENOID VALVE A (LINE PRESSURE SOLENOID VALVE)

      Item Connector Terminal Continuity
      TCM F56 1 Yes
      CVT unit harness connector F30 2
      Fig 5: Checking Continuity Between TCM Connector Terminal And CVT Unit Harness Connector Terminal
      G04916116Courtesy 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 ground and CVT assembly.
    6. Reinstall any part removed.

    OK or NG 

    OK: GO TO  5.

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

  5. CHECK DTC 

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

    OK or NG 

    OK: INSPECTION END 

    NG: GO TO  6.

  6. 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:

    1. Repair or replace damaged parts.
    2. Replace the transaxle assembly. Refer to "REMOVAL AND INSTALLATION ".
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