Tools Required

J 45195 Pressure Gage

Caution: Keep the brakes applied at all times in order to prevent unexpected vehicle motion. Personal injury may result if the vehicle moves unexpectedly.

1. Remove the fluid pressure test hole plug from the transaxle.

Important: Permatex High Temperature Threadsealant P/N 21485278 (GM P/N 12346004) or equivalent must be applied to the threaded components of the pressure gage to ensure that no leakage occurs during testing.

2. Install the J 45195 .
3. Ensure that the gear selector is in PARK and the parking brake is set.
4. Install a scan tool.
5. Start the engine and allow the engine to warm up at idle.
6. Access the Line PC Solenoid functional test on the scan tool output controls.

Notice: The total test running time should not be longer than 2 minutes. Running the test longer than 2 minutes may damage the transaxle.

Important: The scan tool can only control the line pressure control solenoid when the transaxle is in PARK and the engine is running. This protects the transaxle clutches from extremely high or low pressure, as occurs when the transaxle is in DRIVE or REVERSE.

7. With the engine speed at idle, use the scan tool to increase the Line PC Solenoid amperage to 1 amp. Read and record the corresponding line pressure on the pressure gage.

Important: In order to obtain the required pressure for the high pressure test point, the engine speed must be 1,400-1,500 RPM. A line pressure reading taken at a lower engine speed will be inaccurate and may lead to misdiagnosis.

8. Slowly increase the engine speed to 1,400-1,500 RPM before performing the next test step.
9. Using the scan tool, decrease the Line PC Solenoid amperage to 0.2 amp. Read and record the corresponding line pressure on the pressure gage.
10. Compare the collected readings to the Line Pressure table. Refer to Line Pressure .
11. If pressure readings differ greatly from the table, refer to Low Line Pressure or High Line Pressure .
12. Shut the engine OFF. Remove the J 45195 .

Important: Before installing the fluid pressure test hole plug, apply Permatex Medium Grade Threadlocker Blue P/N 12345382 or equivalent to the threads of the plug.

13. Install the fluid pressure test hole plug.

Tighten
Tighten the plug to 9 N·m (7 lb ft).