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Line Pressure Check Procedure: Notes

Tools Required

CAUTION: One or more of the following guidelines may apply when performing specific required tests in the work stall:
  • When a test requires spinning the drive wheels with the vehicle jacked up, adhere to the following precautions:
    • Do not exceed 56 km/h (35 mph) when spinning one drive wheel with the other drive wheel stopped. This limit is necessary because the speedometer indicates only one-half the actual vehicle speed under these conditions. Personal injury may result from excessive wheel spinning.
    • If all of the drive wheels are spinning at the same speed, do not exceed 112 km/h (70 mph). Personal injury may result from excessive wheel spinning.
    • All persons should stay clear of the rotating components and the balance weight areas in order to avoid possible personal injury.
    • When running an engine in the repair stall for an extended period of time, use care not to overheat the engine and the transmission.
  • When a test requires jacking up the vehicle and running with the wheels and brake rotors removed, adhere to the following precautions:
    • Support the suspension at normal ride height.
    • Do not apply the brake with the brake rotors removed.
    • Do not place the transmission in PARK with the drive axles spinning.
    • Turn Off the ignition in order to stop the powertrain components from spinning.
IMPORTANT: Ensure the area around the fluid pressure test hole plug is clean before removing the plug. Do not allow dust or other foreign particles to enter the fluid pressure test hole.
  1. Inspect the transmission fluid level to ensure that the level is correct. Refer to Transmission Fluid Checking Procedure .
  2. Raise the vehicle and correctly support. All four wheels will rotate. Refer to Lifting and Jacking the Vehicle in General Information.
  3. Start the engine and allow the engine to idle until the fan operates.
  4. Install a scan tool.
  5. In order to connect to desired fluid pressure test hole plug the following is required:
    • Line pressure - Accessible from under the vehicle.
    • 5th clutch or reverse clutch - Remove the O2 wire harness bracket.
    • 3rd clutch - Accessible from under the vehicle.
    • 2nd clutch - Accessible from the topside of the transmission.
    • 4th clutch - Disconnect the 4th clutch pressure switch connector. Remove the wire harness bracket bolt.
    • 1st clutch or coast clutch - Remove the left side splash shield. Refer to Splash Shield Replacement - Engine in Body Front End.
    6. Fig 1: J 45542, J 45542-3 & SA9127E
    GM1417930Courtesy of GENERAL MOTORS CORP.
  6. Install the J 45542  (3) using the J 45542-3 bolt (2) and 2 sealing washers to the desired fluid pressure test hole recommended in the symptom tables.
  7. Connect the SA9127E  (1) to the J 45542  (3).
  8. When the test is completed, remove the J 45542  .
  9. Install the fluid pressure test hole plug with a new seal. Do not use the seal again.

    Tighten:  Tighten the test hole plug to 18 N.m (13 lb ft)

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