This should be the MAP sensor wires, but none of the service manuals I can get ahold of have these colors.

Anyone know what is what on the MAP sensor wiring?

thanks

 

wait, isn't the MAP on the car harness anyways on a rex? my rex is a '91 HF (the harness my friend gave me is off his 88 HF) and here is what I think the MAP is now after thinking about it for a while

 

hope this helps ya homie.

 

yellow/red = oil pressure sensor

yellow/green and black = cooling fan switch

 

thanks bro.

For some reason the wires for the ECT and IAT were pinned to the CKP sensor wires (B15 and B16 on my OBD1 harness) so I had to reverse those.

The only other problem I notice is that I have some resistance (not a dead short, but some resistance) between the TPS reference voltage and TPS ground (D20 and D22 on OBD1). I isolated this resistance to the actual car harness itself. If this is not normal, and I don't think it is, then I will have to rerun the wires.

 

according to my Fluke the resistance across the TPS ref voltage and TPS ground on the car harness is 3k ohm, and that is without the conversion harness or engine harness plugged into the car harness.

is this normal???

 

FWIW the PA (atmospheric pressure) sensor shares the 5V source and ground wires with the TPS. This sensor is on the car harness and provided the 3kohm resistance. I'm about to crank the car up and was looking at the schematic in the Helm to find this out.

thanks again jlcrx for the other wiring tips!