Nissan Maxima Service and Repair Manual: P0740 torque converter

Description

  •  The torque converter clutch solenoid valve is activated by the TCM in response to signals sent from the vehicle speed and accelerator pedal position sensors. Lock-up piston operation will then be controlled.
  •  Lock-up operation, however, is prohibited when CVT fluid temperature is too low.
  •  When the accelerator pedal is depressed (less than 2.0/8) in lock-up condition, the engine speed should not change abruptly. If there is a big jump in engine speed, there is no lock-up.

DTC Logic

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

NOTE: Immediately after performing any "DTC CONFIRMATION PROCEDURE", always turn ignition switch OFF.

Then wait at least 10 seconds before performing the next test.

1.CHECK DTC DETECTION

With CONSULT

  1.  Turn ignition switch ON.
  2.  Wait at least 10 consecutive seconds.
  3.  Perform "Self Diagnostic Results" in "TRANSMISSION".

With GST

Follow the procedure "With CONSULT".

Diagnosis Procedure

Regarding Wiring Diagram information, refer to TM-126, "Wiring Diagram".

1.CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE CIRCUIT

  1.  Turn ignition switch OFF.
  2.  Disconnect TCM connector.
  3.  Check resistance between TCM vehicle side harness connector terminal and ground.

2.CHECK HARNESS BETWEEN TCM AND CVT UNIT (TORQUE CONVERTER CLUTCH SOLENOID VALVE) (PART 1)

  1.  Disconnect CVT unit connector.
  2.  Check continuity between TCM vehicle side harness connector terminal and CVT unit vehicle side harness connector terminal.

3.CHECK HARNESS BETWEEN TCM AND CVT UNIT (TORQUE CONVERTER CLUTCH SOLENOID VALVE) (PART 2)

Check continuity between TCM vehicle side harness connector terminal and ground.

4.CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE

Check torque converter clutch solenoid valve. Refer to TM-68, "Component Inspection (Torque Converter Clutch Solenoid Valve)".

5.DETECT MALFUNCTIONING ITEMS

Check TCM connector pin terminals for damage or loose connection with harness connector.

Component Inspection (Torque Converter Clutch Solenoid Valve)

1.CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE

Check resistance between CVT unit connector terminal and ground.

    P0730 incorrect gear ratio
    Description TCM selects the gear ratio using the engine load (throttle position), the primary pulley revolution speed, and the secondary pulley revolution speed as input signals. Then it changes ...

    P0744 torque converter
    Description This malfunction is detected when the torque converter clutch does not lock-up as instructed by the TCM. This is not only caused by electrical malfunctions (circuits open or shorted), ...

    Other materials:

    Instrument Panel
    Vent Headlight/fog light/turn signal switch Supplemental front-impact air bag. Horn Meters and gauges. Warning and indicator lights. Vehicle information display Paddle shifters (if so equipped) Wiper and washer switch Audio controls*. Navigation controls* Hazard warning flash ...

    Xenon headlamp
    Description OPERATION Refer to EXL-10, "Component Description". PRECAUTIONS FOR TROUBLE DIAGNOSIS Installation or removal of the connector must be done with the lighting switch OFF. When the lamp is illuminated (when the lighting switch is ON), do not touch the harness, HID control ...

    P1611 ID discord, IMMU-ECM
    Description BCM performs the ID verification with ECM that allows the engine to start. Start the engine if the ID is OK. ECM prevents the engine from starting if the ID is not registered. BCM starts the communication with ECM if ignition switch is turned ON. DTC Logic DTC DETECTION LOGIC ...

    Nissan Maxima Owners Manual

    Nissan Maxima Service and Repair Manual

    © 2017-2021 Copyright www.nimainfo.com
    0.0221