Jump low pressure switch - 2003 Pontiac Grand Prix

There are 3 points of connection on the harness. Tried all 3 in different combinations. There are 3 points of connection on the harness. Tried all 3 in different combinations.

I should have mentioned that there are 2 wire, 3 wire, 4 wire and in rare instances a 5 wire sensor that can be used.

Unfortunately, each car model is different and there is not an available comprehensive wiring diagram that tells how the automaker chose to use them.

1st, you should only be testing the wire that comes into the switch and one of the two wires going out. One should be going to the fan relay, the other to the computer to tell it to increase the idle rpm.

When I do this type if work, I use the volt/ohm meter to determine which wire is which, so as not to damage anything.

This involves testing from the clutch wiring back to the switch, and testing the switch input. If you're not familiar with doing that, you may need a vehicle specific wiring diagram, (sorry but I only have them for some vehicles), you can usually find them at the parts stores, or on line.

Good luck ! I should have mentioned that there are 2 wire, 3 wire, 4 wire and in rare instances a 5 wire sensor that can be used. Unfortunately, each car model is different and there is not an available comprehensive wiring diagram that tells how the automaker chose to use them. 1st, you should only be testing the wire that comes into the switch and one of the two wires going out. One should be going to the fan relay, the other to the computer to tell it to increase the idle rpm. When I do this type if work, I use the volt/ohm meter to determine which wire is which, so as not to damage anything. This involves testing from the clutch wiring back to the switch, and testing the switch input. If you're not familiar with doing that, you may need a vehicle specific wiring diagram, (sorry but I only have them for some vehicles), you can usually find them at the parts stores, or on line. Good luck !