Required equipment and special tools:
– Special tool (Bvi1215-01);
- – Automatic transmission oil pressure test kit (in case);
- – 25 bar pressure gauge.
Some automatic transmission diagnostic procedures require measuring the pressure in the pressure line using a pressure gauge.
The connection port for the test pressure gauge is located next to the pressure sensor.
fig. Pressure port: 1 - bolt
To check the pressure in the pressure line, loosen the pressure port bolt (Fig. 1).
Connect a test pressure gauge.
Check on a hot engine with a gearbox oil temperature of 60–80 °C.
Check the oil pressure in the pressure line under the following conditions:
- – selector lever in the "P" or "N" position, engine speed 2000 min-1.
The pressure should be between 2.6–3.2 bar;
- – selector lever in the "R" position, engine speed 2000 min –1.
The pressure should be above 4 bar;
- – the selector lever is in position "D", the engine speed is 2000 min –1.
The pressure with 1st gear engaged should be above 7 bar.
If the malfunction persists, the cause is a mechanical or hydraulic fault in the gearbox.
To determine the cause of the malfunction, check the consistency of all conditions and parameters.