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Home >> Acura >> 2004 >> TSX Automatic >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission >> Pressure Test

Pressure Test

Special Tools Required 

  1. Make sure the transmission fluid is filled to the proper level (see ATF LEVEL CHECK  ).
  2. Raise the vehicle up on a lift, or apply the parking brake, block rear wheels, and raise the front of the vehicle. Make sure it is securely supported.
  3. Allow the front wheels to rotate freely.
  4. Remove the splash shield.
  5. Connect the HDS to the DLC (A).
    Fig 1: Connecting HDS To DLC
    G05491322Courtesy of AMERICAN HONDA MOTOR CO., INC.
  6. Make sure the HDS communicates with the PCM. If it does not, go to the DLC circuit troubleshooting; '04-06 models (see '04-06 MODELS ), '07-08 models (see '07-08 MODELS ).
  7. Connect the A/T oil pressure gauge to the line pressure inspection port (A). Do not allow dust or other foreign particles to enter the port while connecting the gauge.
    Fig 2: Identifying Line Pressure Inspection Port
    G05491323Courtesy of AMERICAN HONDA MOTOR CO., INC.
  8. Start the engine, and warm it up to normal operating temperature (the radiator fan comes on).
  9. Hold the engine speed at 2,000 rpm in P or N.
  10. Measure the line pressure at the line pressure inspection port (A).
    NOTE: Higher pressure may be indicated if measurements are made in shift lever position other than P or N.
    FLUID PRESSURE SPECIFICATION

    Pressure Fluid Pressure
    Standard Service Limit
    Line (A) 927-985.6 kPa (9.45-10.05 kgf/cm2 , 134-142.9 psi) 878 kPa (8.95 kgf/cm2 , 127 psi)
  11. Turn the engine off, then disconnect the A/T oil pressure gauge from the line pressure inspection port.
  12. Install the sealing bolt in the line pressure inspection port with a new sealing washer, and tighten the bolt to 18 N.m (1.8 kgf.m, 13 lbf.ft). Do not reuse old sealing washer.
  13. Connect the A/T oil pressure gauge to the 1st clutch pressure inspection port (B).
    Fig 3: Identifying 1st Clutch Pressure Inspection Port
    G05491324Courtesy of AMERICAN HONDA MOTOR CO., INC.
  14. Remove the intake air duct and air cleaner assembly, and connect the A/T oil pressure gauge to the 2nd clutch pressure inspection port (C). Then temporarily install the air cleaner assembly and intake air duct.
    Fig 4: Identifying 2nd Clutch Pressure Inspection Port
    G05491325Courtesy of AMERICAN HONDA MOTOR CO., INC.
  15. Start the engine, and shift the shift lever into M.
  16. Shift to 1st gear, and measure the 1st clutch pressure at the 1st clutch pressure inspection port (B) while holding engine speed at 2,000 rpm.
  17. Shift up to 2nd gear, and measure the 2nd clutch pressure at the 2nd clutch pressure inspection port (C) while holding engine speed at 2,000 rpm.
    FLUID PRESSURE SPECIFICATION

    Pressure Fluid Pressure
    Standard Service Limit
    1st clutch (B) 2nd clutch (C) 917-995.4 kPa (9.35-10.15 kgf/cm2 , 133-144.3 psi) 868 kPa (8.85 kgf/cm2 , 126 psi)
  18. Turn the engine off, then disconnect the A/T oil pressure gauges from the 1st clutch pressure and the 2nd clutch pressure inspection ports.
  19. Install the sealing bolts in the 1st clutch pressure and the 2nd clutch pressure inspection ports with new sealing washers, and tighten the bolts to 18 N.m (1.8 kgf.m, 13 lbf.ft). Do not reuse old sealing washers.
  20. Connect the A/T oil pressure gauge to the 3rd clutch pressure inspection port (D) and the 5th clutch pressure inspection port (F).
    Fig 5: Identifying 3rd Clutch Pressure Inspection Port
    G05491326Courtesy of AMERICAN HONDA MOTOR CO., INC.
  21. Connect the A/Toil pressure gauge to the 4th clutch pressure inspection port (E).
    Fig 6: Identifying 4th Clutch Pressure Inspection Port
    G05491327Courtesy of AMERICAN HONDA MOTOR CO., INC.
  22. Start the engine with the shift lever in P while pressing the brake pedal.
  23. Shift the shift lever to M, and release the brake pedal; the transmission is in 1st gear.
  24. Press the accelerator pedal to increase the engine speed to 2,500 rpm, then shift to 2nd gear.
  25. Release the accelerator pedal slowly to close the throttle over 5 seconds; the engine speed decreases to 1,000 rpm with the transmission in 2nd gear.
  26. Press the accelerator pedal very slowly to increase the engine speed to 2,000 rpm over 5 seconds, and hold the accelerator. Shift to 3rd gear, and measure the 3rd clutch pressure at the 3rd clutch pressure inspection port (D) while holding engine speed at 2,000 rpm.
  27. Shift to 4th gear, and measure the 4th clutch pressure at the 4th clutch pressure inspection port (E) while holding engine speed at 2,000 rpm.
  28. Shift to 5th gear, measure the 5th clutch pressure at the 5th clutch pressure inspection port (F) while holding engine speed at 2,000 rpm.
    FLUID PRESSURE SPECIFICATION

    Pressure Fluid Pressure
    Standard Service Limit
    3rd clutch (D) 4th clutch (E) 5th clutch (F) 917-995.4 kPa (9.35-10.15 kgf/cm2 , 133-144.3 psi) 868 kPa (8.85 kgf/cm2 , 126 psi)
  29. Bring the engine back to an idle, then apply the brake pedal to stop the wheels from rotating.
  30. Shift the shift lever to R, then release the brake pedal. Raise the engine speed to 2,000 rpm, and measure the 4th clutch pressure at the 4th clutch pressure inspection port (E).
    FLUID PRESSURE SPECIFICATION

    Pressure Fluid Pressure
    Standard Service Limit
    4th clutch (E) in R 917-995.4 kPa (9.35-10.15 kgf/cm2 , 133-144.3 psi) 868 kPa (8.85 kgf/cm2 , 126 psi)
  31. Turn the engine off, then disconnect the A/T oil pressure gauges from the 3rd, 4th, and 5th clutch pressure inspection ports.
  32. Install the sealing bolts in the 3rd, 4th, and 5th clutch pressure inspection ports with new sealing washers, and tighten the bolts to 18 N.m (1.8 kgf.m, 13 lbf.ft). Do not reuse old sealing washers.
  33. If the pressures are out of the service limit, the problems and probable causes are listed in the table.
    PROBLEM SYMPTOMS CHART

    Problem Probable causes
    No or low line pressure
    • Torque converter
    • ATF pump
    • Regulator valve
    • Torque converter check valve
    • Clogged ATF strainer
    No or low 1st clutch pressure
    • 1st clutch
    • O-rings
    No or low 2nd clutch pressure
    • 2nd clutch
    • O-rings
    No or low 3rd clutch pressure
    • 3rd clutch
    • O-rings
    No or low 4th clutch pressure
    • 4th clutch
    • O-rings
    No or low 5th clutch pressure
    • 5th clutch
    • O-rings
    No or low 4th clutch pressure in R
    • Servo valve
    • 4th clutch
    • O-rings
  34. Install the air cleaner assembly and intake air duct.
  35. Install the splash shield.