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Home >> Chevrolet >> 2007 >> Impala SS >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transaxle - 4T65-E - Service, Diagnosis & Troubleshooting >> Line Pressure Check

Line Pressure Check

Tools Required

  1. Install a scan tool.
    IMPORTANT:
    • Before performing a line pressure check, verify that the pressure control (PC) solenoid valve is receiving the correct electrical signal from the PCM.
    • Some conditions may be intermittent, therefore this test should be performed at least 3 times.
  2. Start the engine and set the parking brake.
    CAUTION: Keep the brakes applied at all times in order to prevent unexpected vehicle motion. Personal injury may result if the vehicle moves unexpectedly.
  3. Check for a stored Diagnostic Trouble Code (DTC).
  4. Repair the vehicle, if necessary.
  5. Check the fluid level. Refer to the Transmission Fluid Checking .
  6. Check the manual linkage for proper adjustment.
  7. Turn the engine Off.
    Fig 1: View Of Oil Pressure Test Hole Plug & Install J 21867
    GM53763Courtesy of GENERAL MOTORS CORP.
  8. Loosen Exhaust cross-over pipe to allow attachment of J-21467-65  adapter. See Special Tools .
  9. Remove the oil pressure test hole plug and install the J 21867  and J-21467-65  adapter. See Special Tools .
  10. Put the gear selector in PARK range and set the parking brake.
  11. Start the engine and allow the engine to warm up at idle.
  12. Access the PC solenoid valve control test on the scan tool.
    NOTE: The total test running time should not be longer than 2 minutes. Running the test longer than 2 minutes may damage the transaxle.
  13. Increase the PC solenoid actual current from 0 to 1 amps in 0.1 amp increments. Allow the pressure to stabilize for five seconds after each pressure change. Read the corresponding line pressure on the J 21867  .
  14. Refer to the Line Pressure specification table. Compare the data to the table.
  15. If pressure readings differ greatly from the table, refer to Incorrect Line Pressure .
  16. Shut the engine OFF. Remove the J 21867  and J-21467-65  . See Special Tools .
  17. Apply sealant GM P/N 12345382 (Canadian P/N 1095348) to the oil pressure test hole plug.
  18. Install the oil pressure test hole plug.

    Tighten:  Tighten the plug to 12 N.m (106 lb in).

    NOTE: Refer to Fastener Notice .
  19. Re-tighten the exhaust cross-over pipe.
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