Hydraulic Pressure Test: Notes
WARNING: This page is about a different car, the 2014 Mitsubishi Outlander. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
The transmission fluid temperature should be between 70 - 80°C (158 - 176°F) during the test.
- Check the transmission fluid level and temperature. Check engine coolant temperature.
- Transmission fluid level: "HOT" mark on the dipstick
- Transmission fluid temperature: 70 - 80°C (158 - 176°F)
- Engine coolant temperature: 80 - 100°C (176 - 212°F)
- Raise the vehicle so that the wheels are free to turn.
- 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 - Restart the engine.
- 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.
- 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.
- If the pressure is not within the standard value, stop the engine and refer to the HYDRAULIC PRESSURE TEST DIAGNOSIS TABLE .
- Remove the O-ring from the port plug and replace it.
- Remove the special tool, and install the plugs to the hydraulic pressure ports.
- Start the engine and check that there are no leaks around the plugs.
STANDARD HYDRAULIC PRESSURE SPECIFICATIONS
| Measuring conditions | Standard hydraulic pressure MPa (psi) | |||||
|---|---|---|---|---|---|---|
| Selector lever position | Engine speed | Forward clutch pressure [Pressure at FWD] | Reverse brake pressure [Pressure at REV] | Primary pressure [Pressure at PRI] | Line pressure [Pressure at PL] | Torque converter [Pressure at DR] |
| P | Idling | 0 (0) | 0 (0) | 0.1 - 1.5 (15 - 218) | 0.5 - 1.0 (73 - 145) | 0.1 - 1.5 (15 - 218) |
| R | 0 (0) | 0.5 - 1.0 (73 - 145) | 0.1 - 1.5 (15 - 218) | 0.5 - 1.0 (73 - 145) | 0.1 - 1.5 (15 - 218) | |
| N | 0 (0) | 0 (0) | 0.1 - 1.5 (15 - 218) | 0.5 - 1.0 (73 - 145) | 0.1 - 1.5 (15 - 218) | |
| D | 0.5 - 1.0 (73 - 145) | 0 (0) | 0.1 - 1.5 (15 - 218) | 0.5 - 1.0 (73 - 145) | 0.1 - 1.5 (15 - 218) | |
| Ds < Vehicles without paddle shift > | 0.5 - 1.0 (73 - 145) | 0 (0) | 0.1 - 1.5 (15 - 218) | 0.5 - 1.0 (73 - 145) | 0.1 - 1.5 (15 - 218) | |
| L | 0.5 - 1.0 (73 - 145) | 0 (0) | 0.1 - 1.5 (15 - 218) | 0.5 - 1.0 (73 - 145) | 0.1 - 1.5 (15 - 218) | |
HYDRAULIC PRESSURE TEST DIAGNOSIS DESCRIPTION
| Symptom | Faulty part |
|---|---|
| Hydraulic pressure is high at all measuring points. | Incorrect measuring method |
| Hydraulic pressure is low at all measuring points. | Malfunction of oil pump Clogged oil strainer Clogged oil cooler Malfunction in valve body assembly Improper installation of valve body assembly |
| Only forward clutch pressure is abnormal. | Malfunction in valve body assembly Improper installation of valve body assembly Faulty seal ring A |
| Only reverse brake pressure is abnormal. | Malfunction in valve body assembly Improper installation of valve body assembly |
| Only primary pressure is abnormal | Malfunction in valve body assembly Improper installation of valve body assembly |
| Only line pressure is abnormal. | Malfunction in valve body assembly Improper installation of valve body assembly |
| Only torque converter output pressure is abnormal | Malfunction in valve body assembly Improper installation of valve body assembly Malfunction of torque converter Faulty seal ring B |