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. 1. 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 position "P" or "N", engine speed 2000 min⁻¹. The pressure should be between 2.6–3.2 bar;
- selector lever in position "R", engine speed 2000 min⁻¹. The pressure should be higher than 4 bar;
- selector lever in position "D", engine speed 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.
