- A) Warm up the transmission fluid to operating temperature (50-80°C).
- b) Unscrew the service plug of the gearbox housing and connect a pressure gauge in its place.
Attention: carry out the check with two people - one person must observe the wheels or wheel stoppers, and the second person must carry out the check.
2. Measure the pressure.
- A) Start driving by depressing the accelerator pedal half way or more. Check the pressure change in the line. Pressure 294-588 kPa.
- b) Release the accelerator pedal. Measure the line pressure. Pressure 9.8 kPa or less.
Attention:
- Make sure there is no wheel slip during the test.
- Carry out the test at an automatic transmission temperature of 50-80°C.
3. Measure the line pressure when the solenoid valve is open (voltage applied)
- A) To measure, carry out additional operations,
- prepare an additional connector,
- connect wires, 1-2 m long to the terminals "1" And "3" connector,
- Connect the 24W pump as shown in the picture.
- b) Connect the positive battery terminal to the terminal "1", and the negative terminal to the output "3".
- V) Measure pressure at idle speed and maximum speed.
4. Analysis of test results:
- A) The pressure value for all conditions above those indicated in table 4:
- the control valve for blocking the center differential is faulty,
- b) If the measured values for all states are less than the specified ones, then:
- faulty oil pump
- the control valve for blocking the center differential is faulty,
- V) If the measured values are lower or higher than those indicated when the adapter is connected, then:
- Faulty control valve for locking the center differential.
Table 4
Engine operating mode | Adapter | Line pressure, kPa |
Idle mode | connected | 363-422 |
Max RPM | connected | 735-863 |
All modes | not connected | 9.8 or less |