Hydraulic Pressure Test

HYDRAULIC PRESSURE TEST

CAUTION
The transmission fluid temperature should be between 70 - 80 degrees C (158 - 176 degrees F) during the test.

1. Check the transmission fluid level and temperature. Check engine coolant temperature.
^ Transmission fluid level: "HOT" mark on the dipstick
^ Transmission fluid temperature: 70 - 80 degrees C (158 - 176 degrees F)
^ Engine coolant temperature: 80 - 100 degrees C (176 - 212 degrees F)
2. Raise the vehicle so that the wheels are free to turn.





3. Connect the special tools (3.0 MPa (427 psi) oil pressure gauge [MD998330] and joint [MD998331, MB992127]) to each pressure discharge port.

NOTE:
DR: Torque converter output pressure port
PRI: Primary pressure port
PL: Line pressure port
FWD: Forward clutch pressure port
REV: Reverse brake pressure port

4. Restart the engine.





5. Check that there are no leaks around the special tool port adapters.

WARNING
For safety, operators must not stand in front of and at the rear of the vehicle during this test.

6. Measure the hydraulic pressure at each port under the conditions given in the standard hydraulic pressure table, and check that the measured values are within the standard value ranges.
7. If the pressure is not within the standard value, stop the engine and refer to the hydraulic pressure test diagnosis table.
8. Remove the O-ring from the port plug and replace it.
9. Remove the special tool, and install the plugs to the hydraulic pressure ports.
10. Start the engine and check that there are no leaks around the plugs.

Standard hydraulic pressure table





Hydraulic pressure test diagnosis table

Symptom Chart:

Seal ring location