Main Pressure, measuring
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- Before measuring the main pressure activate the Diagnostic Trouble Code (DTC) Memory and eliminate possible electrical malfunctions.
See ON BOARD DIAGNOSTIC (OBD), PERFORMING .
See connector for pressure manometer (arrow).
- Remove bolt for main pressure tapNOTE: Always replace bolt for main pressure tap.
- Connect pressure tool VAG 1702 or equivalent and tighten knurled screw.
- Vent pressure tool line VAG 1702 by loosening the knurled screw with engine running.NOTE: Re-tighten knurled screw after ventilation.
- Bring ATF temperature to 60 C (140 F) by connecting VAG 1551 Scan Tool and reading measuring value block.
See VAG 1551 SCAN TOOL (ST), CONNECTING AND SELECTING FUNCTIONS .
Min. Pressure Specified value in bar (psi) gauge pressure:
MAIN PRESSURE SPECIFICATION VALUESAutomatic Transmission Selector lever positions and test conditions 01M D
IdleR
IdleConnector for solenoid valves removed (1) D
Engine speed
approx. 2000 rpmR
Engine speed
approx. 2000 rpmMain pressure in bar (psi) 3.4 - 3.8 (49 - 55) 6.5 - 7.5 (94 - 109) 10.1 -11.3 (146 - 164) 23.0 - 24.0 (334 - 348) (1) After connecting the connectors for solenoid valves, activate Diagnostic Trouble Code (DTC) Memory and erase. See DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, ERASING (FUNCTION 5). - If possible, conduct the main pressure check on a chassis dynamometer (rolling road).
If deviations to the specified values are observed the following may be the cause:
MAIN PRESSURE TROUBLESHOOTINGPossible Cause Remedy Idle rpm too high Adjust engine ATF-Pump faulty Check ATF Pump and replace if necessary Valve stuck in valve body Replace valve body