Volkswagen Workshop Service and Repair Manuals

Measuring main pressure Inferences about the “hydraulic system” of the gearbox may be made based on the main pressure measurement. t  The output of the ATF pump can be checked. t  It can be checked whether the valve body is jammed or catches or exhibits excessive leakage.

Special tools and workshop equipment required

t	Drip tray -V.A.G 1306-

t	Torque wrench -V.A.G 1331-

t	Automatic gearbox tester -V.A.G 1702-

t	Volkswagen testers → Chapter

Test conditions l  No faults stored in memory of automatic gearbox control unit -J217-; do not disconnect tester! l  → ATF level OK

If possible, check the main pressure on a rolling road dynamometer.

–  Remove noise insulation tray -arrows-.

Location of main pressure bolt

–  Remove bolt -arrow- for main pressure hole; always renew bolt. –  Connect automatic gearbox tester -V.A.G 1702- and tighten knurled screw.

–  Ensure that knurled screw is tight. –  Start engine. –  Bleed automatic gearbox tester -V.A.G 1702- by unscrewing knurled screw. Tighten screw again after bleeding. The manometer is bled when a drop of → ATF escapes. –  Press Guided functions. –  Identify vehicle. –  Select automatic gearbox 01M –  Read measured value - gearbox control unit –  Bring → ATF temperature to 60° C. Main pressure specifications at idling speed

	Selector lever positions
	D	R
	Idling	Idling
Main pressure in bar	3.4…3.8	5…6

Deviations from specifications may be due to the following causes:

Possible causes	Remedy
Idling speed too high	Adjust engine
→ ATF pump defective	Check → ATF pump and renew if necessary
Valves stuck in → valve body	Renew → valve body.

–  Switch off engine.

Connector for solenoid valves → arrow-arrow- –  Press locking device together and pull off connector. –  Start engine. Main pressure specifications at 2000 rpm

	Selector lever positions and measuring conditions
	D	R
	Engine speed approx. 2000 rpm	Engine speed approx. 2000 rpm
Main pressure in bar	12.4…13.2	23.0…24.0

Deviations from specifications may be due to the following causes:

Possible causes	Remedy
→ ATF pump defective	Check → ATF pump and renew if necessary
Valves stuck in → valve body	Renew → valve body.

After the measurement: –  Remove automatic gearbox tester -V.A.G 1702-. –  Install new bolt for main pressure hole and tighten to 12 Nm.

–  Push on connector for → solenoid valves-arrow-. –  After joining connector, read and then erase fault memory.

–  Install noise insulation -arrows-.