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Home >> Acura >> 2003 >> MDX Base >> 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, and make sure it is securely supported.
  3. Allow all four wheels to rotate freely.
  4. Connect the HAS to the DLC (A).
    Fig 1: Identifying DLC Location
    G03640320Courtesy of AMERICAN HONDA MOTOR CO., INC.
  5. Remove the splash shield.
  6. Connect the oil pressure gauges to the line pressure inspection port (A), 5th clutch pressure inspection port (B), and 3rd clutch pressure inspection port (C) at the front lower of the transmission. Do not allow dust or other foreign particles to enter the ports while connecting the gauges.
    Fig 2: Connecting Oil Pressure Gauges To Line Pressure Inspection Port
    G03640321Courtesy of AMERICAN HONDA MOTOR CO., INC.
  7. Warm up the engine (the radiator fan comes on), then stop it.
  8. Remove the intake air duct, and connect the oil pressure gauges to the 2nd clutch pressure inspection port (D) and 4th clutch pressure inspection port (E). Then temporarily install the air cleaner housing and intake air duct.
    Fig 3: Connecting Oil Pressure Gauges To 2nd Clutch Pressure Inspection Port And 4th Clutch Pressure Inspection Port
    G03640322Courtesy of AMERICAN HONDA MOTOR CO., INC.
  9. Connect the oil pressure gauge to the 1st clutch pressure inspection port (F), and 1st-port clutch pressure inspection port (G) at the transmission end cover.
    Fig 4: Connecting Oil Pressure Gauge To 1st Clutch Pressure Inspection Port, And 1st-Port Clutch Pressure Inspection Port
    G03640323Courtesy of AMERICAN HONDA MOTOR CO., INC.
  10. Start the engine, and run it at 2,000 RPM in the P or N position.
  11. 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 N or P.
    FLUID PRESSURE

    Pressure Fluid Pressure
    Standard Service Limit
    Line (A) 900-960 kPa (9.2-9.8 kgf/cm2 , 130-140 psi) 850 kPa (8.7 kgf/cm2 , 120 psi)
  12. Shift to the 1 position, and measure the 1st clutch pressure at the 1st clutch pressure inspection port (F) and 1st-hold clutch pressure at the 1st-hold clutch pressure inspection port (G).
  13. Shift to the 2 position, and measure the 2nd clutch pressure at the 2nd clutch pressure inspection port (D).
  14. Shift to the P position, then press the brake pedal and hold it.
  15. Shift to the D3 position, and release the brake pedal; the transmission is in 1st gear.
  16. Press the accelerator pedal to increase the engine speed to 2,500 RPM; the transmission shifts to 2nd gear.
  17. Release the accelerator pedal to close fully the throttle over 5 seconds; the engine speed decrease to 1,000 RPM with the transmission in 2nd gear.
  18. Press the accelerator pedal very slowly to increase the engine speed 2,000 RPM over 5 seconds, and hold the accelerator; the transmission shifts to 3rd gear. Measure the 3rd clutch pressure at the 3rd clutch pressure inspection port (C) while holding engine speed at 2,000 RPM.
  19. Shift to the D4 position (the transmission will shift to 4th gear at about 2,500 RPM), reduce the engine speed to 2,000 RPM, and measure the 4th clutch pressure at the 4th clutch pressure inspection port (E).
  20. Shift to the D5 position (the transmission will shift to 5th gear at about 2,500 RPM), reduce the engine speed to 2,000 RPM, and measure the 5th clutch pressure at the 5th clutch pressure inspection port (B).
  21. Bring the engine back to an idle, then apply the brake to stop the wheels from rotating.
  22. Shift to the R position. Raise the engine RPM to 2,000 RPM, and measure the 5th clutch pressure at the 5th clutch pressure inspection port (B).
    FLUID PRESSURE

    Pressure Fluid Pressure
    Standard Service Limit
    1st-hold clutch (G) 760-830 kPa (7.7-8.5 kgf/cm2 , 110-120 psi) 710 kPa (7.2 kgf/cm2 , 100 psi)
    1st clutch (F) 890-970 kPa (9.1-9.9 kgf/cm2 , 130-140 psi) 840 kPa (8.6 kgf/cm2 , 120 psi)
    2nd clutch (D)
    3rd clutch (C)
    4th clutch (E)
    5th clutch (B)
  23. If the measurements are out of the service limit, problems and probable causes are listed in the table.
    PROBLEMS AND PROBABLE CAUSES

    Problem Probable causes
    No or low line pressure
    • Torque converter
    • ATF pump
    • Regulator valve
    • Torque converter check valve
    • Low fluid level
    • 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 5th clutch pressure in the R position
    • Servo valve
    • 5th clutch
    • O-rings
    No or low 1st-hold clutch pressure
    • 1st-hold clutch
    • O-rings
  24. Install the sealing bolts with the new sealing washers, and tighten the bolts to 18 N.m (1.8 kgf.m, 13 lbf.ft). Do not reuse old sealing washers.

    Torque: 18 N.m (1.8 kgf.m, 13 lbf.ft) 

  25. Install the air cleaner housing and intake air duct.
  26. Install the splash shield.