Table of Contents
REF: Service Procedures 30
Testing the Oil Pressure Switch
Testing for an Open Circuit
These were bench tested but can simulate conditions while installed with the signal wire removed.
This requires a multi-meter set for continuity with the buzzer.
The black probe below can alternately be placed against the engine.
With the engine shut off and the signal wire dis-connected, the contact points should be pressing against each other ensuring continuity.
This tested out to be defective with an open circuit. 1) | |
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Testing for the Opening / Closing Pressure
This setup was made using regular plumbing and air hose fittings.
This requires a multi-meter set for continuity with the buzzer.
The valve was placed inline in case something went wrong. 2) |
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With zero pressure applied, the circuit is closed, continuity is achieved between the probes and the buzzer sounds off. 3) | With 27 PSI applied, continuity is broken and the buzzer is quiet. 4) |
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This switch didn't make contact until the pressure got down to about 2-1/2 PSI. However, this test should have been performed with a lower range gauge for tighter low end calibration. 5) |
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