PCM need oil pressure output?

[4x43100]

Hello, I am making the PCM harness from a 3100 out of a 98 malibu into a swap harness, and I have a PCM connector pinout. When going through each pin I noticed the oil pressure sending unit sends a signal to the PCM but has no direct output. Is this fed through the Serial II Data port to the idiot light on the instrument cluster or does the PCM need this signal for some function? Thanks.

[grandamle91]

I believe it's serial data

[1988GTU]

Oil pressure should be PCM related as its often related to the fuel system as a "safety" function.

[Guest]

It's simply used by the PCM to measure the fuel pump voltage.

[grandamle91]

When i did my LQ4 swap into my Chevy Astro i didn't even use the sender for the pcm I used a single wire sender and wired it right to the gauge

[4x43100]

It's simply used by the PCM to measure the fuel pump voltage.

How exactly? That seems kinda strange...I am fairly certain at this point it is sent to the BCM through the serial data pin on the PCM. I know its not the same car but I have a Cadlliac SLS that starts and runs with absolutely no oil pressure (motor was already shot from previous owner, its a parts car).

[grandamle91]

same thing with all my cars, You can unplug it and they will still run

[1988GTU]

It should extend the cranking before it fires and starts up with no OPSU connected/broke/hodgepodged

[4x43100]

It should extend the cranking before it fires and starts up with no OPSU connected/broke/hodgepodged

If this is the case, could any such relation be taken out of the factory tune with HP tuners?

[caffeine]

PCM need oil pressure output?

It should extend the cranking before it fires and starts up with no OPSU connected/broke/hodgepodged

ONLY if the fuel pump relay is fried is the oil pressure switch required to run the fuel pump.