Nissan Maxima Service and Repair Manual: P0778 pressure control solenoid B

Description

The secondary 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

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 and maintain the following conditions 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 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.

2.CHECK HARNESS BETWEEN TCM AND 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.

3.CHECK HARNESS BETWEEN TCM AND SECONDARY PRESSURE SOLENOID VALVE (PART 2

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

4.CHECK SECONDARY PRESSURE SOLENOID VALVE

Check secondary pressure solenoid valve. Refer to TM-78, "Component Inspection (Secondary Pressure Solenoid Valve)".

5.DETECT MALFUNCTIONING ITEMS

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

Component Inspection (Secondary Pressure Solenoid Valve)

1.CHECK SECONDARY PRESSURE SOLENOID VALVE

Check resistance between CVT unit connector terminal and ground.