RavenMocker Posted July 21, 2014 Posted July 21, 2014 1986 MJ with 4 cylinder. There is a two wire connector that on my vehicle is located behind the intake manifold and the firewall. The female connector has a purple wire with a white stripe and a white wire with a black stripe. The make end has a wire that is red and the other is white. This connector came lose before and the engine shut off and would but start. It would turn over but not start. As soon as I put the connector together the truck started right up and was happy. Well this time the wire dropped and was pulled out of the firewall or where ever the male connector with red wire and a white wire. I need to find out where that wire plugs into. Or if I can find the two common wires that can be used so I can get my truck started and home. I will try and get a pic posted.
shelbyluvv Posted July 21, 2014 Posted July 21, 2014 It may be the MAP sensor wiring. A pic would help a lot. EDIT: Engine Speed sensor WHT/BLK goes to pin 28 of the ECM VIO/WHT goes to pin 11 of the ECM
RavenMocker Posted July 21, 2014 Author Posted July 21, 2014 Are there any other common wires that share the same pins?
1989 Eliminator Posted July 21, 2014 Posted July 21, 2014 That sounds like it is the CPS. Crankshaft Position Sensor. There are no other common wires for the CPS. The CPS works by magnetism and sends a signal to the ECU. The CPS is located on the top, front portion of the transmission and sits in a slot. As the flywheel turns, the CPS picks up high and lows spots that the flywheel has in its deisgn. So if the plug fell down along side the firewall it is still hanging there somewhere. Picture would help!
shelbyluvv Posted July 21, 2014 Posted July 21, 2014 It very well could be the CPS. all the rockauto ones show a red and white wire on them.
1989 Eliminator Posted July 21, 2014 Posted July 21, 2014 I'm just confused on what happened. The connector got unplugged and it just dropped down or it melted off?
RavenMocker Posted July 21, 2014 Author Posted July 21, 2014 The plug that has the male end on it was ripped from where ever it was wired into.
Eagle Posted July 21, 2014 Posted July 21, 2014 I'm voting for CPS. It's a 2-wire connector, and it's located behind the intake manifold.
RavenMocker Posted July 22, 2014 Author Posted July 22, 2014 Well I made it home with a tow. But the issue still remains and I hope it is not something to serious. I see there is some confusion so I will try and explain. That connector with the wires hanging from it is whats left. You can see the black plastic is the female side of the connector. The male side is no longer there but those two wires have been plugged into the female connector. The male side has the red and white wires. The male side was pulled out of from where ever it is wired and left me with a two foot loom with two wires sticking out.
RavenMocker Posted July 22, 2014 Author Posted July 22, 2014 I haven't been under the truck yet but I think it just might be the CPS.
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