Strange and wonderful

[Jeepjunker]

So I’ve had an MJ for a little while working on the odds and ends here and there to make it roadworthy  . And it’s almost there yesterday i got my REM in the mail. Installed it and all of a sudden no start . Cranks fine but will not start . It reads CPS fault . Sounds simple replace It and call it a day . But the PO of the truck has some hack jobs I'm cleaning up and that’s one of them . Instead of 3 wires i have two . My question is is this the right cps even in the truck where to look for a third wire when replacing it . But it has ran for the past month so I’m a little lost 

[Ωhm]

Vehicle harness would/should have had this connector. They used a 3_pin connector with 1 empty cavity.

 

 

 

[Jeepjunker]

Thank you that makes me know at least I’m not missing a wire . Any way to know if they’ve got that hooked up correctly white to black . And then red to white/black

[cruiser54]

From the factory the wires were the same color on both sides of the connector.

Violet with tracer and white with tracer. Not red and white. 

[gogmorgo]

If the thing was working, and you didn’t unplug the wires, they’re still sitting in the same configuration they were when they were working.

I’d be very suspicious of the connection at the crimps and spade terminals. It’s pretty clearly a chunk of wire that’s been added at some point, and probably looks the same down towards the sensor somewhere at the other end of the chunk.

If the uninsulated spade is touching ground, that’s a problem.

Cruiser54.com tip #7 details how to test the CPS. Test at both ends of the spliced-in section. If it’s below voltage at the sensor end of the splice it’s potentially a failed CPS, but if it’s only below voltage at the opposite end of the splice from the sensor, there’s a problem with the splicing.