Performance Pack Oil Pressure Sending Unit

[Keiferson22]

Hey everyone, not sure I'm in the right place but here goes. I'm trying to understand how the sending unit works. This particular unit has 3 pins. Pins 1,2 and 3 are labeled "oil pressure switch", "signal return" and "Vref". I am assuming Vref is 5V and pin 1 is ground and pin 2 is signal 0.5-4.5V.

When I check continuity between the threaded portion and pin 1, I see no continuity without pressure and no continuity with pressure (slowly ramping from 0-80 psi).

When I hook the sensor up to a 5V source with Pin 1 set to ground and read pin 2, I see 0.5V constantly no matter what pressure is applied to the sensor.

Please help!

Sponsored

 

[dgc333]

Pin 1 is a path to ground to operate a low pressure warning such as an idiot light. Pins 2 and 3 are a variable resistance proportional to pressure for the gauge.

I have a number of cars over the years that have had three pin oil and temperature senders that operated a gauge and an idiot light.

 

[Keiferson22]

Pin 1 is a path to ground to operate a low pressure warning such as an idiot light. Pins 2 and 3 are a variable resistance proportional to pressure for the gauge.

I have a number of cars over the years that have had three pin oil and temperature senders that operated a gauge and an idiot light.

OK, this is how I understand it as well. I have now purchased two brand new sensors and neither one of them show any continuity between pin 1 and threaded portion (chassis ground) when pressure is applied and always show infinite resistance no matter what...

Sponsored