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Home >> Pontiac >> 2008 >> Torrent GXP, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 88 (Automatic Transmission - AF33-5 - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis) >> Line Pressure Check >> Pressure Check

Pressure Check

WARNING: This page is about a different car, the 2009 Pontiac Torrent and 2009 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: View Of Automatic Transmission Fluid Pressure Test Hole Plug
    GM1407706Courtesy 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 Engine Splash Shield Replacement .
  3. Remove the automatic transmission fluid pressure test hole plug (66) and O-ring seal (67).
    4. Fig 2: Identifying J-21867-50 & J 21867
    GM1454974Courtesy of GENERAL MOTORS CORP.
  4. Install the J-21867-50  (2) with a sealing washer on each side of the adapter into the test hole. See Special Tools .
  5. Install the quick connect fitting of the J-21867-50  on the hose of J 21867  . See Special Tools .
  6. Connect the J 21867  (1) to the J-21867-50  (2). See Special Tools .
  7. Fully apply the parking brake.
  8. Connect a scan tool for engine RPMs.
  9. Start the engine and allow the engine to warm up at idle.
  10. Firmly apply the brake and shift into REVERSE (R).
  11. Allow the engine to idle and record the line pressure: 500-610 kPa (73-89 psi).
    12. NOTE: Do not perform the 2900 RPM test longer than 5 seconds.
  12. Increase the engine speed to 2900 RPM and record the line pressure: 1710-1980 kPa (248-287 psi).
  13. Allow the transmission fluid to cool at idle in PARK (P) for at least one minute.
  14. Firmly apply the brake and shift into DRIVE (D).
  15. Allow the engine to idle and record the line pressure: 330-390 kPa (48-57 psi).
    16. NOTE: Do not perform the 2900 RPM test longer than 5 seconds.
  16. Increase the engine speed to 2900 RPM and record the line pressure: 1280-1390 kPa (186-202 psi).
  17. If the line pressure reading is not within specifications refer to the Line Test Results  table.
    18. Fig 3: View Of Automatic Transmission Fluid Pressure Test Hole Plug
    GM1407706Courtesy of GENERAL MOTORS CORP.
    CAUTION: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
  18. Remove the tools and install the automatic transmission fluid pressure test hole plug (66) and a new O-ring (67). Tighten the test hole plug to 7 N.m (62 lb in).
  19. Install the left front splash shield. Refer to Engine Splash Shield Replacement .
Line Test Results

Result Possible Cause
HIGHER than specification in BOTH DRIVE AND REVERSE
  • Line pressure control solenoid valve assembly - SLT (316) concern
  • Primary regulator valve (395) concern
LOWER than specification in BOTH DRIVE AND REVERSE
  • Line pressure control solenoid valve assembly - SLT (316) concern
  • Primary regulator valve (395) concern
  • Fluid pump assembly (2) concern
  • 1-2 reverse clutch (603) concern
LOWER than specification in DRIVE ONLY
  • Low system line pressure
  • 1-2 reverse clutch (603) slipping
  • DRIVE hydraulic circuit concern/failure
  • Forward clutch (565) concern
LOWER than specifications in REVERSE ONLY
  • REVERSE hydraulic circuit concern/failure
  • Direct clutch (562) concern
  • Low and reverse clutch (511) concern
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