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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 2090 (Continuously Variable Transmission (CVT)) >> DTC P0740 Torque Converter Clutch Solenoid Valve >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2008 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK INPUT SIGNAL 

    With CONSULT-III 

    1. Start engine.
    2. Select "MAIN SIGNALS" in "DATA MONITOR" mode for "TRANSMISSION" with CONSULT-III.
    3. Start vehicle and read out the value of "ISOLT1".
    ISOLT1 DISPLAY VALUE

    Item name Condition Display value (Approx.)
    ISOLT1 Lock-up OFF 0.0 A
    Lock-up ON 0.7 A

    Without CONSULT-III 

    1. Start engine.
    2. Check voltage between TCM connector terminal and ground.
      TCM CONNECTOR TERMINAL AND GROUND

      Name Connector Terminal Condition Voltage (Approx.)
      Torque converter clutch solenoid valve F56 3 - ground When vehicle cruises in "D" position Lock-up ON 6.0 V
      Lock-up OFF 1.0 V
    3. Turn ignition switch OFF.
    4. Disconnect TCM connector.
    5. Check if there is continuity between the connector terminal and ground.
      6. Fig 1: Checking Voltage Between TCM Connector Terminal And Ground
      G04916101Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO  5.

    NG: GO TO  2.

  2. CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect TCM connector.
    3. Check resistance between TCM connector terminal and ground.
    RESISTANCE REFERENCE CHART

    Solenoid valve Connector Terminal Resistance (Approx.)
    Torque converter clutch solenoid valve F56 3 - Ground 3.0 - 9.0 Ω

    OK or NG 

    OK: GO TO  5.

    NG: GO TO  3.

    Fig 2: Checking Resistance Between TCM Connector Terminal And Ground
    G04916102Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK HARNESS BETWEEN TCM AND TORQUE CONVERTER CLUTCH SOLENOID VALVE 
    1. Turn ignition switch OFF.
    2. Disconnect TCM connector and CVT unit harness connector.
    3. Check continuity between TCM connector terminal and CVT unit harness connector terminal.
      CONTINUITY REFERENCE

      Item Connector Terminal Continuity
      TCM F56 3 Yes
      CVT unit harness connector F30 12
      Fig 3: Checking Continuity Between TCM Connector Terminal And CVT Unit Harness Connector Terminal
      G04916103Courtesy 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  4.

    NG: Repair or replace damaged parts.

  4. 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 REFERENCE CHART

    Solenoid Valve Connector Terminal Resistance (Approx.)
    Torque converter clutch solenoid valve F30 12 - Ground 3.0 - 9.0 Ω
    Fig 4: Checking Resistance Between CVT Unit Harness Connector Terminal And Ground
    G04916104Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO  5.

    NG: Repair or replace damaged parts.

  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: Repair or replace damaged parts.

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