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Re: 87 4K Quattro CS - Oil light and buzzer keep going off
In message <199906261622.MAA29181@pop04.iname.net> Max Dichter writes:
> I was hoping someone out there could give me some insight into why my oil
> light and buzzer keep going off. They go on every once and awhile, and
> usually they only stay on for a second or two.
This is 1988 ur-quattro stuff - is any of it relevant:
Test - Oil warning
>From "Reparaturleitfaden Audi quattro, Ausgabe 10/87, D 000.5147.00.00"
Procedure for checking oil warning light - MB engine
a) Engine correctly filled with oil.
b) Oil warning light must be on when ignition switched on and engine stopped.
c) Oil temperature must be at least 80c.
d) Rev counter must be functioning normally
If the oil warning light does not come on check the oil pressure sender
(G10) and the controller (J114, control number 234).
Only contact "G" on the oil pressure sender is used.
Remove the connector from the oil pressure sender G10.
Connect VAG 1526 [an ohmmeter, I presume] to contact G on G10 via an extension
cable and to chassis ground.
Switch VAG 1526 to the 200 ohm range.
With the engine off, the reading should be 5 to 10 ohms.
With the engine idling, the reading should be 70 to 120 ohms.
With the engine at 3000rpm, the reading should be 170 to 200 ohms.
Attach the ohmmeter between contact WK on G10 and chassis ground.
With the engine idling, the resistance should be zero to 0.5 ohm.
With the engine off, the resistance should be infinite.
If any of the preceding tests fail, replace G10.
Procedure for checking oil warning lamp control unit - MB engine
Pull the control unit out of its position (6) on the auxiliary relay carrier.
Connect the VAG 1527 diode check light to contacts 4 and 5 of the socket.
Switch on the ignition. The diode must light up. If not, check for a circuit
fault using the circuit diagram.
Connect the diode check light between contacts 5 and 8 of the socket.
Turn the engine over with the starter motor. The diode check light must blink
during the start procedure, and glow steadily with the motor running. If not,
check for a circuit fault using the circuit diagram.
Connect the diode check light between contacts 2 and 4 of the socket.
Switch the ignition on. The diode must light up. If not, check the oil
pressure sender and/or the circuit for faults.
Pull the connector G off the oil pressure sender G10. The diode must not light
up. If it does, check for a short circuit using the wiring diagram.
Connect contact 6 of the socket to chassis ground using a piece of wire. The
oil warning light must light up. If not, check for a circuit fault using the
If all tests are completed successfully, replace the J114 control unit.
UK Audi quattro Owners Club
Phone: 0385 302803 Fax: 0870 0883933