P0745

DTC P0745 LINE PRESSURE SOLENOID VALVE







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.

The line pressure duty cycle value is not consistent when the closed throttle position switch is ON. To confirm the line pressure duty cycle at low pressure, the accelerator (throttle) should be open until the closed throttle position switch is OFF.

CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE:

NOTE: The line pressure duty cycle value is not consistent when the closed throttle position switch is ON. To confirm the line pressure duty cycle at low pressure, the accelerator (throttle) should be open until the closed throttle position switch is OFF.

TCM TERMINALS AND REFERENCE VALUE:

ON BOARD DIAGNOSIS LOGIC:

DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION PROCEDURE

NOTE: If "DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE" has been previously conducted, always turn ignition switch OFF and wait at least 5 seconds before conducting the next test.

After the repair, perform the following procedure to confirm the malfunction is eliminated.











With CONSULT-II
1. Turn ignition switch ON and select "DATA MONITOR" mode for "ENGINE" with CONSULT-II.
2. Depress accelerator pedal completely and wait at least 1 second.


With GST
Follow the procedure "With CONSULT-II".

AT - LPSV:

Diagnostic Procedure

1. CHECK GROUND CIRCUIT
1. Turn ignition switch to OFF position.
2. Disconnect terminal cord assembly connector in engine compartment.
3. Check resistance between terminal cord assembly connector E72 terminal 4 and ground. Refer to "Wiring Diagram - AT - LPSV".

Is resistance approximately 2.5 - 5 Ohms?

Yes >> GO TO 2.

No >>
1. Remove control valve assembly.
2. Check the following items:
Line pressure solenoid valve
Harness of terminal cord assembly for short or open


2. CHECK POWER SOURCE CIRCUIT
1. Turn ignition switch to OFF position.
2. Disconnect TCM harness connector.
3. Check resistance between terminal cord assembly connector E72 terminal 4 and TCM harness connector M77 terminal 2. Refer to "Wiring Diagram - AT - LPSV".

Is resistance approximately 12 Ohms?

Yes >> GO TO 3.

No >> Check the following items:
- Dropping resistor
- Harness for short or open between TCM connector M77 terminal 2 and terminal cord assembly.


3. CHECK POWER SOURCE CIRCUIT
1. Turn ignition switch to OFF position.
2. Check resistance between terminal cord assembly connector E72 terminal 4 and TCM connector M77 terminal 1. Refer to "Wiring Diagram - AT - LPSV".

Is resistance approximately 0 Ohms?

Yes >> GO TO 4.

No >> Repair or replace harness between TCM connector and terminal cord assembly connector.


4. CHECK DTC
Perform Diagnostic Trouble Code (DTC) confirmation procedure.

OK or NG?

OK >> INSPECTION END.

NG >>
1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.



LINE PRESSURE SOLENOID VALVE / Component Inspection










Resistance Check
Check resistance between terminal 6 and ground.







Operation Check
Check solenoid valve by listening for its operating sound while applying battery voltage to the terminal 6 and ground.







DROPPING RESISTOR
Check resistance between terminals 1 and 2.

Resistance 12 Ohms : Approximately