Oil prssure warning light - MB engine

["Steve Evans" <sevans@radstone.co.uk>]

Phil,

This should have been in the June '95 archives on the list but they appear not to exist. :(

I only have a paper copy left without trawling through backups...

So, some typing later:

Procedure for checking oil warning light - MB engine 

Pre-requisites

1. Engine correctly filled with oil.
2. Oil warning light must be on with the ignition on and engine stopped.
3. Oil temperature must be at least 80degC.
4. Rev. counter must be functioning correctly.

Hints:
1. If the oil warning light does not come on, check the oil pressure sender (G10) and the controller (J114, control number 234).
2. Only contact G of G10 is used.
       _____
   ___|     |___
  /             \
 /   G      WK   \
 |   --     --   |
 |               |
 \               /
  \             /
   \___________/


1. Remove the connector from the oil pressure sender G10.
2. Connect VAG1526 to contact G of G10 via an extension cable and to chassis ground.
3. Switch VAG1526 to the 200ohm range.
4. With the engine off, the reading should be 5 to 10 ohms.
5. With the engine idling, the reading should be 70 to 120 ohms.
6. With the engine at 3000rpm, the reading should be 170 to 200 ohms.
7. Connect VAG1526 to contact WK of G10 via an extension cable and to chassis ground.
8. With the engine idling the resistance should be <0.5ohm
9. With the engine off the resistance should be infinite

Procedure for checking oil warning lamp control unit – MB engine

1. Pull the control unit (J114) from the additional relay carrier (position 6 behind glove-box).
2. Connect the VAG1527 diode check light across contacts 4 and 5 of the socket.
3. Switch on the ignition. The diode should light.
4. Connect the VAG1527 across contacts 5 and 8 of the socket.
5. Crank the engine on the starter. The LED should blink during cranking and then glow steadily with the engine running.
6. Connect the VAG1527 across contacts 2 and 4 of the socket.
7. Switch on the ignition. The diode should light.
8. Pull connector G off the oil pressure sender (G10). The LED should go out. If not check for wiring shorts.
9. Connect contact 6 to chassis ground using a length of wire. The warning light should light.

Regards,

Steve

Steve Evans                       Radstone Technology Plc.
Principal Design Engineer         Water Lane,
PowerPC Group                     Towcester,
Tel: +44 (0) 1327 359444          Northants,
Fax: +44 (0) 1327 358113          NN12 6JN
Email: sevans@radstone.co.uk      ENGLAND