AT

P0745 PRESSURE CONTROL SOLENOID A





Description
The line pressure solenoid valve regulates the oil pump discharge pressure to suit the driving condition in response to signals sent from the TCM.
The line pressure duty cycle value is not constant 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-III Reference Value in Data Monitor Mode









On Board Diagnosis Logic
- This is an OBD-II self-diagnostic item.
- Diagnostic trouble code "P0745 PC SOLENOID A" with CONSULT-III or 11th judgement flicker without CONSULT-III is detected when TCM detects an improper voltage drop while it tries to operate the solenoid valve.




Possible Cause
- Harness or connector
(The solenoid circuit is open or shorted.)
- Line pressure solenoid valve




DTC Confirmation Procedure

CAUTION:
If performing this "DTC Confirmation Procedure" again, always turn ignition switch OFF and wait at least 10 seconds before continuing.
After the repair, perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT-III
1. Turn ignition switch ON and select "DATA MONITOR" mode for "TRANSMISSION" with CONSULT-III.
2. Touch "START".
3. Depress accelerator pedal completely and wait at least 1 second.
4. If the check result is NG, go to AT .

WITH GST
Follow the procedure "WITH CONSULT-III".

WITHOUT CONSULT-III
1. Start engine.
2. With brake pedal depressed, shift the lever from "P" to "N" to "D" to "N" to "P" positions. 3. Perform self-diagnosis. Diagnosis Procedure Without CONSULT-III .
4. If the check result is NG, go to AT .




Wiring Diagram - AT - LPSV

AT-LPSV-01:

TCM TERMINALS AND REFERENCE VALUES
TCM Terminal And Reference Value.




Diagnosis Procedure
1.CHECK INPUT SIGNAL
With CONSULT-III
1. Turn ignition switch ON. (Do not start engine.)
2. Select "MAIN SIGNALS" in "DATA MONITOR" mode for "TRANSMISSION" with CONSULT-III.
3. Read out the value of "LINE PRES DTY" while driving. Check the value changes according to driving speed.





Without CONSULT-III
1. Turn ignition switch ON. (Do not start engine.)





2. Check voltage between TCM connector terminals and ground.





OK or NG
OK - GO TO 5.
NG - GO TO 2.
2.CHECK DROPPING RESISTOR
1. Turn ignition switch OFF.
2. Disconnect dropping resistor harness connector in engine room.





3. Check resistance between terminals.






OK or NG
OK - GO TO 3.
NG - Repair or replace damaged parts.
3.CHECK VALVE RESISTANCE
1. Turn ignition switch OFF.
2. Disconnect terminal cord assembly connector in engine room.





3. Check resistance between terminal cord assembly harness connector terminal and ground.





OK or NG
OK - GO TO 4.
NG - Repair or replace damaged parts.
4. CHECK HARNESS BETWEEN TCM AND TERMINAL CORD ASSEMBLY HARNESS CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect terminal cord assembly harness connector and TCM connector.





3. Check continuity between terminal cord assembly harness connector terminal and TCM connector terminal.









4. Check continuity between terminal cord assembly harness connector terminal and dropping resistor harness connector terminal.









5. Check continuity between dropping resistor harness connector terminal and TCM connector terminal.





6. If OK, check harness for short to ground and short to power.
7. If OK, check continuity between ground and transaxle assembly.
8. Reinstall any part removed.
OK or NG
OK - GO TO 5.
NG - Repair open circuit or short to ground or short to power in harness or connectors.
5.CHECK DTC
Perform AT .
OK or NG
OK - INSPECTION END
NG - GO TO 6.
6.CHECK TCM
1. Check TCM input/output signal. TCM Terminal And Reference Value .
2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK - INSPECTION END
NG - Repair or replace damaged parts.




Component Inspection

LINE PRESSURE SOLENOID VALVE
- For removal, Service and Repair .

Resistance Check





- Check resistance between terminal and ground.





Operation Check





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

DROPPING RESISTOR





- Check resistance between terminals.