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Oil Pressure Gauge/Warning system problems 1989-91 Audi 100/200
The Oil pressure gauge and the Oil Pressure warning system (Auto-Check System) uses two oil pressure sending units. There is a small white colored 1.8 bar single wire sensor which is used above 2000 RPM to warn of low oil pressure (less than 1.8 bar).
In some cases poor connections inside the instrument cluster (IC) can cause false oil pressure warnings/beeps, so if the oil pressure sensors check out ok, you may need to remove the IC and resolder all the connector terminals on the Auto Check and cluster circuit boards.
There is also a larger diameter 2 wire gauge sending unit which provides a varying resistance output for the instrument panel oil pressure gauge (Terminal G on the sending unit, black connector).
This gauge sending unit also has a 0.3 bar warning connection (WK) for the Auto-Check system oil pressure warning system which uses a colored coded connector terminal (BLUE).
These sending units are located on the driver side of the engine block, underneath the lower radiator hose area.
Normally with the ignition key on, the oil pressure gauge will read near 0 bar. If the gauge is pegged all the way up to over 5 bar with the ignition key on, or with the engine running, you may have defective gauge sending unit. Try grounding the G terminal wire with the ignition key on, the gauge should read near O bar.
With the 2 wires disconnected from the gauge sending unit, and the engine off, you should measure approximately 5-10 ohms resistance on the G terminal to engine ground. At idle the sending unit gauge output terminal G resistance should be around 70-120 ohms depending on oil temp/viscosity. With the engine running around 3000 RPM, you should measure 170-200 ohms on this G terminal to engine ground. With the engine off you should measure less than 1 ohm on the WK terminal to engine ground, with the engine running the resistance reading should go very high (i.e. Mega-ohms or Infinity)
The small white single wire 1.8 bar oil pressure warning sensor should connect the terminal to ground when the oil pressure is above 1.8 bar, i.e. when the engine is running over 2000 RPM.
The replacement oil pressure gauge sending unit should be marked with a 0-5 bar, and 0.3 bar output near the threaded portion