P0963

P0963-PRESSURE CONTROL SOLENOID A CONTROL CIRCUIT HIGH





For a complete wiring diagram, refer to the Wiring Information.

Theory of Operation

The Transmission Control Module (TCM) regulates the line pressure by pulsing the line pressure solenoid. The TCM monitors the line pressure solenoid voltage and current draw during operation.

- When Monitored:
Ignition on with a system voltage between 9.0 and 16.0 Volts.

No Line Pressure Solenoid Circuit Low DTC present.

- Set Condition:
When the target line pressure solenoid current is greater than 0.75 of an amp while the monitored line pressure solenoid current is less than 0.4 of an amp for the period of five seconds.





Always perform the CVT Pre-Diagnostic Troubleshooting procedure before proceeding. Initial Inspection and Diagnostic Overview.

1. CHECK TO SEE IF THE DIAGNOSTIC TROUBLE CODE (DTC) IS ACTIVE
1. Using the scan tool, read Transmission DTCs.

Is the status Active or is the Starts Since Set counter 2 or less for this DTC?

Yes

- Go To 2

No

- Go To 6

2. CHECK THE (T20) LINE PRESSURE SOLENOID CONTROL CIRCUIT




1. Turn the ignition off to the lock position.
2. Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector.
3. Ignition on, engine not running.
4. Using the scan tool, actuate the Line Pressure Solenoid.
5. Using a test light connected to ground, check the (T20) Line Pressure Solenoid Control circuit in the Transmission Solenoid/Pressure Switch Assembly harness connector.

NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.

Does the test light illuminate brightly?

Yes

- Go To 3

No

- Go To 5

3. CHECK THE (T20) LINE PRESSURE SOLENOID CONTROL CIRCUIT FOR A SHORT TO VOLTAGE




1. Using the scan tool, stop the actuation of the Line Pressure Solenoid.
2. Turn the ignition off to the lock position.
3. Disconnect the TCM C1 harness connector.
4. Ignition on, engine not running.
5. Measure the voltage of the (T20) Line Pressure Solenoid Control circuit.

Is the voltage above.05 of a Volt?

Yes

- Repair the (T20) Line Pressure Solenoid Control circuit for a short to voltage.
- Perform the CVT TRANSMISSION VERIFICATION TEST. CVT Transmission Verification Test.

No

- Go To 4

4. CHECK THE LINE PRESSURE SOLENOID




1. Turn the ignition off to the lock position.
2. Reconnect the Transmission Solenoid/Pressure Switch Assembly harness connector.
3. Measure the resistance between ground and the (T20) Line Pressure Solenoid Control circuit in the TCM C1 harness connector.

Is the resistance between 3.0 and 9.0 Ohms?

Yes

- Using the schematics as a guide, check the Transmission Control Module (TCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. Check for any Service Bulletins for possible causes that may apply. If no problems are found, replace the TCM.
- Perform the CVT TRANSMISSION VERIFICATION TEST. CVT Transmission Verification Test.

No

- Replace the Line Pressure Solenoid (Valve Body).
- Perform the CVT TRANSMISSION VERIFICATION TEST. CVT Transmission Verification Test.

5. CHECK THE (T20) LINE PRESSURE SOLENOID CONTROL CIRCUIT FOR AN OPEN




1. Turn the ignition off to the lock position.
2. Measure the resistance of the (T20) Line Pressure Solenoid Control circuit between the TCM C1 harness connector and the Transmission Solenoid/Pressure Switch Assembly harness connector.

Is the resistance above 5.0 Ohms?

Yes

- Repair the (T20) Line Pressure Solenoid Control circuit for an open.
- Perform the CVT TRANSMISSION VERIFICATION TEST. CVT Transmission Verification Test.

No

- Using the schematics as a guide, check the Transmission Control Module (TCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. Check for any Service Bulletins for possible causes that may apply. If no problems are found, replace the TCM.
- Perform the CVT TRANSMISSION VERIFICATION TEST. CVT Transmission Verification Test.

6. CHECK THE WIRING AND CONNECTORS
1. The conditions necessary to set this DTC are not present at this time.
2. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
3. Wiggle the wires while checking for shorted and open circuits.

Were there any problems found?

Yes

- Repair as necessary.
- Perform the CVT TRANSMISSION VERIFICATION TEST. CVT Transmission Verification Test.

No

- Test Complete.