- special device (Bvi. 1215-01);
- automatic transmission oil pressure test kit (in a case);
- pressure gauge 25 bar.
Some automatic transmission diagnostic procedures require the pressure in the delivery line to be measured with a pressure gauge.
The hole for connecting the control pressure gauge is located next to the pressure sensor.
Pic. 3.139. Pressure port: 1 - bolt
To check the pressure in the pressure line, unscrew the bolt of the pressure port (pic. 3.139).
Connect a control pressure gauge.
Perform the check on a hot engine at an oil temperature in the gearbox of 60-80°C.
Check the oil pressure in the pressure line under the following conditions:
- selector lever in position «R» or «N», engine speed 2000 min–1. The pressure should be within 2.6–3.2 bar;
- selector lever in position «R», engine speed 2000 min–1. The pressure must be above 4 bar;
- selector lever in position «D», engine speed 2000 min–1. The pressure in 1st gear must be above 7 bar.
If the fault persists, the cause is a mechanical or hydraulic fault in the transmission.
To determine the causes of the malfunction, check the correspondence of all states and parameters.
After troubleshooting
Delete stored faults from the memory and move the card in the reader to the 1st fixed position.
Carry out a road test.
Finish the operation by checking with the diagnostic tool.