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Home >> Nissan-Datsun >> 2004 >> Altima S, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1002 (Automatic Transmission (Re0F09B)) >> Component Diagnosis >> P0778 Pressure Control Solenoid B Electrical (Sec Pressure Solenoid Valve) >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2009 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK PRESSURE CONTROL SOLENOID VALVE B (SECONDARY PRESSURE SOLENOID VALVE) CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect TCM connector.
    3. Check resistance between TCM vehicle side harness connector terminal and ground.
    TERMINAL RESISTANCE REFERENCE

    TCM vehicle side harness connector Ground Resistance (Approx.)
    Connector Terminal
    F15 39 3.0 - 9.0 Ω

    Is the inspection result normal? 

    YES: GO TO 5.

    NO: GO TO 2.

    Fig 1: Checking Resistance Between TCM Vehicle Side Harness Connector Terminal 39 And Ground
    G05689333Courtesy of NISSAN MOTOR CO., U.S.A.
  2. CHECK HARNESS BETWEEN TCM AND PRESSURE CONTROL SOLENOID VALVE B (SECONDARY PRESSURE 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.
    TERMINAL CONTINUITY REFERENCE

    TCM vehicle side harness connector CVT unit vehicle side harness connector Continuity
    Connector Terminal Connector Terminal
    F15 (A) 39 F46 (B) 3 Existed

    Is the inspection result normal? 

    YES: GO TO 3.

    NO: Repair or replace damaged parts.

    Fig 2: Checking Continuity Between TCM And CVT Unit Vehicle Side Harness Connector Terminals
    G05689334Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK HARNESS BETWEEN TCM AND PRESSURE CONTROL SOLENOID VALVE B (SECONDARY PRESSURE SOLENOID VALVE) (PART 2)

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

    TERMINAL CONTINUITY REFERENCE

    TCM vehicle side harness connector Ground Continuity
    Connector Terminal
    F15 39 Not existed

    Is the inspection result normal? 

    YES: GO TO 4.

    NO: Repair or replace damaged parts.

    Fig 3: Checking Continuity Between TCM Vehicle Side Harness Connector Terminal 39 And Ground
    G05689333Courtesy of NISSAN MOTOR CO., U.S.A.
  4. CHECK PRESSURE CONTROL SOLENOID VALVE B (SECONDARY PRESSURE SOLENOID VALVE)

    Check pressure control solenoid valve B (secondary pressure solenoid valve). Refer to "COMPONENT INSPECTION [PRESSURE CONTROL SOLENOID VALVE B (SECONDARY PRESSURE SOLENOID VALVE)] ".

    Is the inspection result normal? 

    YES: GO TO 5.

    NO: Replace transaxle assembly. Refer to "EXPLODED VIEW ".

  5. DETECT MALFUNCTIONING ITEMS

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

    Is the inspection result normal? 

    YES: Replace TCM. Refer to "EXPLODED VIEW ".

    NO: Repair or replace damaged parts.

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