Oil Level Switch - NO GROUND

[ktmccrary]

98gtp3800sc
My Haynes manual tells me the black wire with the white stripe on the Oil Level Sensor physically goes to vehicle ground. Mine shows open to ground from both the connector and bare wire behind the connector I stripped back.

Can anyone tell me the actual physical location of this ground? I have pulled apart wire bundles physically tracing it and it bypasses the PCM and routes back over the radiator, and so could come out anywhere. I have ohmed through every BLK/WHT wire I can find in the engine bay, including the fuse block but I suspect this wire is broken, so if I found the other end of it I wouldn't know it.

The BLK/WHT wire on the ign ctrl module appears to share this physical ground, but tracing from that direction is going to be hard because it is routed around the front end of the left valve cover with a heavy bracket covering it up. There is a BLK/WHT ground wire in the same vicinity on an intake manifold bolt, but it appears to route in the same general direction as the ICM but it is outside the sheath and I can tell where it goes. It's a very tight fit. BUT the ground on the ICM is fine.

Finally, this ground is also shared by the transaxle range switch, which is also not working right.

I have spent weeks on this. Is there anyone out there that can help?

[matt5112]

The oil pressure light comes on when the circuit is completed.

If your oil pressure light comes on when you put the key in the on position without the engine running.

I assume it doesnt come on when you do as I previously mentioned?

[kfish]

oil LEVEL sensor

[BillBoost37]

All the grounds to the engine/trans etc come from the lower front bolt of the trans to engine. There should be one main cable and two smaller wires bolted in. Pull them off and check that they are clean and making good contact. If this persists, holler back and I'll look up the location of the splices and tell you exactly where the issue could be if it's not the wire at the trans.

[ktmccrary]

I am talking about the OIL LEVEL switch, not oil pressure. I have physically traced the BLK/WHT ground wire off the oil level sensor, by ripping apart wire bundles and it goes around by the PCM, over the top of the radiator, around the battery and into the engine fuse box at pin D3 on the big black connector, and that pin is not at ground. It is surrounded by 3 other grounds, but it isn't itself.. I tried to upload pics, but every time I try it says "upload failed"

[BillBoost37]

Okey dokey..I'll try and remember to look at the schematic tonight to figure out where it goes.