Line Pressure Check Procedure: Notes

Tools Required

• J 35752  Oil Pressure Gage Adapter
• J 21867  Universal Pressure Gage Set

IMPORTANT: This test should only be performed at a normal operating fluid temperature of 50-80°C (122-176°F).
1. Raise the vehicle. Support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
2. Remove the left splash shield from vehicle. Refer to Splash Shield Replacement - Engine - Left in Body Front End.
Fig 1: Pressure Tap Bolt
Courtesy of GENERAL MOTORS CORP.
3. Remove the pressure tap bolt (2) from the rear of the transaxle.
Fig 2: Pressure Gauge And Oil Pressure Gauge Adapter
Courtesy of GENERAL MOTORS CORP.
4. Install J 35752  into the line pressure tap at the rear of the transaxle.
5. Install J 21867  into J 35752  .
6. Lower the vehicle.
7. Route J 21867  hose over the front fender and through the driver's window so that it can be read from the passenger compartment.
8. Connect the scan tool to the Data Link Connector (DLC) and display the engine RPM.
9. Apply the parking brake and block the vehicle wheels.
10. Press the brake pedal fully and start the engine.
11. Display engine speed (RPM) on the scan tool.
CAUTION: For the following four steps, procedures for testing line pressure at idle and stall speeds, the brake pedal must be fully pressed throughout the measurement procedure. Failure to do so could result in personal injury and/or property damage.
12. Place the manual selector in the drive (D) range and record the line pressure at idle speed (600-700 RPM).
NOTE: DO NOT run engine at stall speed for more than five seconds continuously or engine oil and transaxle fluid temperatures may become excessively high.
13. Press the accelerator pedal fully/wide open throttle and record the line pressure in the drive (D) range at stall speed (2,400-2,700 RPM). Release the accelerator pedal.
14. Keeping the brake pedal fully pressed, place the selector lever in the reverse (R) range and record the line pressure at idle speed (600-700 RPM).
15. Press the accelerator pedal fully/wide open throttle and record the line pressure in the reverse (R) range at stall speed (2,400-2,700 RPM). Release the accelerator pedal.
16. Keep brake pedal fully pressed.
17. Place manual selector in Low range. Record line pressure at idle speed (600-700 RPM).
18. Press accelerator pedal fully/wide open throttle and record line pressure in Low range at stall speed (2,400-2,700 RPM). Release accelerator pedal.
19. Keeping brake pedal fully pressed, place manual selector in Reverse range and record line pressure at idle speed (600-700 RPM).
20. Press accelerator pedal fully/wide open throttle and record line pressure in Reverse range at stall speed (2,400-2,700 RPM). Release accelerator pedal.
21. Place manual selector in Park range and turn ignition switch to LOCK.
22. Remove the scan tool from the vehicle.
23. Remove J 21867  from the passenger compartment.
24. Raise the vehicle. Support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
25. Remove J 21867  from J 35752  .
26. Remove J 35752  from the line pressure tap at the rear of the transaxle.
NOTE: Refer to Fastener Notice in Cautions and Notices.
27. Install the line pressure tap bolt into the line pressure tap at the rear of the transaxle.

    Tighten:  Tighten the line pressure tap bolt to 7.5 N.m (66 lb in).

28. Install the left splash shield. Refer to Splash Shield Replacement - Engine - Left in Body Front End.
29. Lower the vehicle.