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17Lubrication System
Edition 08.96
Testing oil pressure and oil pressure switch
Special tools, testers and aids required
Oil pressure tester (e.g. V.A.G 1342)
Diode test lamp (e.g. V.A.G 1527)
Adapter cable set (e.g. V.A.G 1594)
Current flow diagram
Operation of dynamic oil pressure warning system
Testing warning lamp After ignition on („terminal 15 on“) and engine not running, the oil pressure warning lamp flashes (not on models with Auto Check System).
Warning criteria
Engine not running and oil pressure switch closed.
Coolant temperature greater than 60 °C, engine speed greater than 1500 rpm and oil pressure switch open.
At an engine speed of more than 5000 rpm an active oil warning is not cancelled, irrespective of the position of the oil pressure switch.
If the voltage supply of the control unit is o.k. (terminal 15) and the oil pressure switch is open for longer than 0.5 seconds at engine speeds of more than 1500 rpm, this is stored. If this condition occurs three times during „terminal 15 on“, the warning becomes or remains active even at engine speeds of less than 1300 rpm.
Test conditions
Engine oil level o.k.; inspect page 17-10
Oil pressure warning lamp (K3) should come on when ignition switched on.
The o.k. readout on vehicles with Auto Check System should come on (select symbol)
Engine oil temperature at least 80 °C (radiatorfan should have cut in once)
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19Cooling System
Edition 08.96
Testing cooling system for leaks
Special tools, testers and aids required
Cooling system tester V.A.G 1274
Adapter V.A.G 1274/8
Adapter V.A.G 1274/9
Test condition
Engine at operating temperature
Test procedure
- Open cap of coolant expansion reservoir.
Important! Hot steam may escape when the expansion re-servoir is open. Cover over cap with cloth and open
carefully.
- Mount tester V.A.G 1274 with adapter V.A.G
1274/8 onto the expansion reservoir.
- Operate the priming pump of the tester to produce a pressure of about 0.1 MPa.
- If the pressure drops, locate the leakage point and rectify.
Testing pressure relief valve in cap
- Screw cap onto the tester using adapter V.A.G 1274/9.
- Operate the priming pump of the tester to produce a pressure of about 0.15 MPa.
- The pressure relief valve should open at a pressure of 0.12 ... 0.15 MPa.
