Nissan Maxima Service and Repair Manual: P1777 step motor

Description

The step motor changes the step by turning 4 coils ON/OFF according to the signal from TCM. As a result, the flow of line pressure to primary pulley is changed and pulley ratio is controlled.

DTC Logic

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

CAUTION: Always drive vehicle at a safe speed.

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.  Start engine.

  2.  Drive vehicle for at least 5 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 STEP MOTOR CIRCUIT

  1.  Turn ignition switch OFF.

  2.  Disconnect TCM connector.

  3.  Check resistance between TCM vehicle side harness connector terminals.

4. Check resistance between TCM vehicle side harness connector terminals and ground.

2.CHECK HARNESS BETWEEN TCM AND CVT UNIT (STEP MOTOR) (PART 1)

  1.  Disconnect CVT unit connector.

  2.  Check continuity between TCM vehicle side harness connector terminals and CVT unit vehicle side harness connector terminals.

3.CHECK HARNESS BETWEEN TCM AND CVT UNIT (STEP MOTOR) (PART 2)

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

4.CHECK STEP MOTOR

Check step motor. Refer to TM-111, "Component Inspection (Step Motor)".

5.DETECT MALFUNCTIONING ITEMS

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

Component Inspection (Step Motor)

1.CHECK STEP MOTOR

1. Check resistance between CVT unit connector terminals.

2. Check resistance between CVT unit connector terminals and ground.

    P1745 line pressure control
    Description The line pressure solenoid valve regulates the oil pump discharge pressure to suit the driving condition in response to a signal sent from the TCM. DTC Logic DTC DETECTION LOGIC ...

    P1778 step motor
    Description  The step motor changes the step by turning 4 coils ON/OFF according to the signal from TCM. As a result, the flow of line pressure to primary pulley is changed and pulle ...

    Other materials:

    Rear seat
    Exploded View - Fixed Seatback Headrest Headrest holder (free) Headrest holder (locked) Bumper Seatback assembly Seatback trim Seatback pad Seat cushion trim Seat cushion pad Seat cushion wire cover Seat cushion lock Seat cushion assembly Removal and Installati ...

    Front drive shaft
    Removal and Installation (LH) Drive shaft  Cotter pin REMOVAL Remove wheel and tire using power tool. Refer to WT-60, "Adjustment".  Remove wheel sensor from steering knuckle. Refer to BRC-102, "Removal and Installation - Front Wheel Sensor".CAUTION: Do not pull o ...

    Front stabilizer
    Removal and Installation REMOVAL Remove the steering gear and linkage. Refer to ST-26, "Removal and Installation". Remove the nuts on the upper portion of stabilizer connecting rod Remove the stabilizer clamp bolts. Remove the front stabilizer from the vehicle INSPECTION AFTER ...

    Nissan Maxima Owners Manual

    Nissan Maxima Service and Repair Manual

    © 2017-2024 Copyright www.nimainfo.com
    0.0064