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Home › Saturn › 2008 › Astra XE, Automatic › Repair and Diagnosis › Transmission › Automatic Trans › Automatic Transmission › Diagnostic Information and Procedures › Line Pressure Check › Check Procedure

Check Procedure

    Fig 1: View Of Retaining Clips For The Transmission And Cooler Lines
    GM1998894Courtesy of GENERAL MOTORS CORP.
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. Remove the left front splash shield. Refer to Splash Shield Replacement-Engine  .
  3. Remove the retaining clips for the transmission and cooler lines.
  4. Remove the cooler lines from the transmission.
    5. Fig 2: View Of Automatic Transmission Fluid Pressure Test Hole Plug With The O-Ring Seal
    GM1998895Courtesy of GENERAL MOTORS CORP.
  5. Remove the automatic transmission fluid pressure test hole plug (816) with the O-Ring seal (815).
    6. Fig 3: View Of KM 580 And SA9127E
    GM1998896Courtesy of GENERAL MOTORS CORP.
  6. Install the KM 580 (1) with sealing washer into the fluid test hole plug.
  7. Connect the KM 580 (1) to the SA9127E  (2). See Special Tools .
  8. Install the oil cooler lines and retainer clips.
  9. Fully apply the parking brake.
  10. Connect a scan tool for engine RPMs.
  11. Start the engine and allow the engine to warm up at idle.
  12. Firmly apply the brake and shift into REVERSE (R).
  13. Allow the engine to idle and record the line pressure.

    Specifications:  510-610 kPa (74-89 psi)

    14. IMPORTANT: Do not perform the 2545 RPM test longer than 5 seconds.
  14. Increase the engine speed to 2545 RPM and record the line pressure.

    Specifications:  1470-1690 kPa (213-245 psi)

  15. Allow the transmission fluid to cool at idle in PARK (P) for at least one minute.
  16. Firmly apply the brake and shift into DRIVE (D).
  17. Allow the engine to idle and record the line pressure.

    Specifications:  360-420 kPa (52-56 psi)

    18. IMPORTANT: Do not perform the 2600 RPM test longer than 5 seconds.
  18. Increase the engine speed to 2545 RPM and record the line pressure.

    Specifications:  1100-1280 kPa (160-186 psi)

  19. If the line pressure reading is not within specifications refer to the Line Test Results .
    20. Fig 4: View Of Automatic Transmission Fluid Pressure Test Hole Plug With The O-Ring Seal
    GM1998895Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  20. Remove the tools and install the automatic transmission fluid pressure test hole plug (816) and a new O-Ring (815).

    Tighten:  Tighten the test hole plug to 7 N.m (62 lb in).

  21. Install the transmission oil cooler lines.
  22. Install the left front splash shield. Refer to Splash Shield Replacement-Engine  .
Line Test Results

Result Possible Cause
Higher than standards in both Drive and Reverse
  • Line pressure control solenoid - (STH) (316) failure
  • Primary regulator valve (379) failure
Lower than standards both Drive and Reverse
  • Line pressure control solenoid - (STH) (316) failure
  • Primary regulator valve (379) failure
  • Fluid pump (2) failure
Lower than standards only Drive
  • Drive hydraulic circuit failure
  • Forward Clutch (18) failure
Lower than standards only Reverse
  • Reverse hydraulic circuit failure
  • Reverse gear clutch (23) failure
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