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Home >> Acura >> 2007 >> MDX >> 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 on a lift, and make sure it is securely supported.
  3. Allow all four wheels to rotate freely.
  4. Remove the transmission undercover (A) and splash shield (B).
    Fig 1: Transmission Undercover And Splash Shield With Torque Specification
    G05485582Courtesy of AMERICAN HONDA MOTOR CO., INC.
  5. Remove the damper from the front subframe.
    Fig 2: Damper With Torque Specification
    G05485583Courtesy of AMERICAN HONDA MOTOR CO., INC.
  6. Connect the HDS to the DLC (A), and go to the A/T data list. If the HDS does not communicate with the PCM, troubleshoot the DLC circuit (see DLC CIRCUIT TROUBLESHOOTING ).
    Fig 3: Identifying Data Link Connector
    G05485584Courtesy of AMERICAN HONDA MOTOR CO., INC.
  7. Connect the oil pressure gauge to the line pressure inspection hole (A). Do not allow dust or other foreign particles to enter the hole while connecting the gauge.
    Fig 4: Identifying A/T Oil Pressure Gauge Set And Line Pressure Inspection Hole
    G05485585Courtesy of AMERICAN HONDA MOTOR CO., INC.
  8. Start the engine in P, and warm it up to normal operating temperature (the radiator fan comes on).
  9. Measure the line pressure at the line pressure inspection port (A) in P or N while holding the engine speed at 2,000 rpm.
    NOTE: Higher pressure may be indicated if measurements are made in the shift lever position other than P or N.
    FLUID PRESSURE REFERENCE

    Pressure Fluid Pressure
    Standard Service Limit
    Line (A) 950-1,010 kPa (9.7-10.3 kgf/cm2 , 138-147 psi) 900 kPa (9.2 kgf/cm2 , 131 psi)
  10. Turn the engine off, then disconnect the oil pressure gauge from the line pressure inspection port.
  11. Install the sealing bolt to 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 the old sealing washer.
  12. Connect the oil pressure gauge to the 1st clutch pressure inspection port (B) and the 1st-hold clutch pressure inspection port (C).
    Fig 5: Identifying 1st Clutch Pressure Inspection Port And 1st-Hold Clutch Pressure Inspection Port
    G05485586Courtesy of AMERICAN HONDA MOTOR CO., INC.
  13. Remove the air cleaner housing and intake air duct, and connect the oil pressure gauge to the 2nd clutch pressure inspection port (D). Then temporarily install the air cleaner housing and intake air duct.
    Fig 6: Identifying 2nd Clutch Pressure Inspection Port
    G05485587Courtesy of AMERICAN HONDA MOTOR CO., INC.
  14. Start the engine disable the VSA by pressing the VSA OFF switch, the shift in to P.
  15. Shift into 1st gear, and measure the 1st clutch pressure at the 1st clutch pressure inspection port (B) and 1st-hold clutch pressure at the 1st-hold clutch pressure inspection port (C) while holding the engine speed at 2,000 rpm.
  16. Upshift to 2nd gear by pushing the shift lever, and measure the 2nd clutch pressure at the 2nd clutch pressure inspection port (D) while holding the engine speed at 2,000 rpm.
    FLUID PRESSURE REFERENCE

    Pressure Fluid Pressure
    Standard Service Limit
    1st clutch (B)
    2nd clutch (D)
    940-1,020 kPa (9.6-10.4 kgf/cm2 , 137-148 psi) 890 kPa (9.1 kgf/cm2 , 130 psi)
    1st-hold clutch (C) 680-760 kPa (6.9-7.7 kgf/cm2 , 98-110 psi) 630 kPa (6.4 kgf/cm2 , 91 psi)
  17. Turn the engine off, remove the air cleaner housing and intake air duct, then disconnect the oil pressure gauges from the 1st clutch pressure, 1st-hold clutch pressure, and 2nd clutch pressure inspection ports.
  18. Install the sealing bolts in the 1st clutch pressure, 1st-clutch hold clutch pressure, and 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 the old sealing washers.
  19. Install the air cleaner housing and intake air duct.
  20. Connect the oil pressure gauge to the 3rd clutch pressure inspection port (E) and the 5th clutch pressure inspection port (G).
    Fig 7: Identifying 3rd Clutch Pressure Inspection Port And 5th Clutch Pressure Inspection Port
    G05485588Courtesy of AMERICAN HONDA MOTOR CO., INC.
  21. Connect the oil pressure gauge to the 4th clutch pressure inspection port (F).
    Fig 8: Identifying 4th Clutch Pressure Inspection Port
    G05485589Courtesy of AMERICAN HONDA MOTOR CO., INC.
  22. Cancel the transmission 2nd-hold control mode with the HDS; select Pressure Assistance Mode in the Miscellaneous Test Menu of the A/T Mode Menu.
  23. Start the engine, and shift to D3.
  24. Measure the 3rd clutch pressure at the 3rd clutch pressure inspection port (D) while holding the engine speed at 2,000 rpm.
  25. Shift to D, and measure the 4th clutch pressure at the 4th clutch pressure inspection port (E) while holding the engine speed at 2,000 rpm.
  26. Measure the 5th clutch pressure at the 5th clutch pressure inspection port (F) while holding the engine speed at 2,000 rpm.
    FLUID PRESSURE REFERENCE

    Pressure Fluid Pressure
    Standard Service Limit
    3rd clutch (E)
    4th clutch (F)
    5th clutch (G)
    940-1,020 kPa (9.6-10.4 kgf/cm2 , 137-148 psi) 890 kPa (9.1 kgf/cm2 , 130 psi)
  27. Bring the engine back to an idle, then apply the brake pedal to stop the wheels from rotating.
  28. Shift to R, then release the brake pedal. Raise the engine speed to 2,000 rpm, and measure the 5th clutch pressure at the 5th clutch pressure inspection port (G).
    FLUID PRESSURE REFERENCE

    Pressure Fluid Pressure
    Standard Service Limit
    5th clutch (G) in R 940-1,020 kPa (9.6-10.4 kgf/cm2 , 137-148 psi) 890 kPa (9.1 kgf/cm2 , 130 psi)
  29. Turn the engine off, then disconnect the oil pressure gauges from the 3rd, 4th, and 5th clutch pressure inspection ports.
  30. 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 the old sealing washers.
  31. If any of the pressures are out of the service limit, the possible problems and probable causes are listed in the table.
    PROBLEM SYMPTOM 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 5th clutch pressure in R
    • Servo valve
    • 5th clutch
    • O-rings
    No or low 1st-hold clutch pressure
    • 1st-hold clutch
    • O-rings
  32. Install the damper on the front subframe.
  33. Install the splash shield and transmission undercover.
  34. Relive any VSA DTCs with the HDS, and clear them.