Have Jeep Questions? Ask a Jeep Repair Expert for Answers
Hello and welcome! Thank you for requesting me! Are you saying that the engine cranks over but does not start or are you saying that the engine does not crank over at all?
Got it! Does the check engine light come on with the key on? Does the TPS have 5 volts with the key on?
It looks like the PCM does not control the starter relay. The above should not matter. It should be a simple diagnoses. Just remove the starter relay and check for battery voltage on two of the four female pins with the key in the crank position. One power comes from the ignition switch and fuse 31 in the junction block and the other power comes directly from fuse 8 under the hood. Then the PNP switch grounds the starter relay with the transmission in park or nuetral and that allows the relay to activate and send power down to the starter motor.
Here is a wiring diagram of the starting circuit.
Anything in this circuit can go bad preventing the starter from getting power. Also, be sure that the battery checks out good and the battery cables/connections are clean and tight. Also, dont forget about the grounds. Battery ground, engine ground and frame ground.
Does that help? Does that make sense? Did you have any further questions?
Sounds good! Please let me know how it goes.
I think it would be easier for us to talk over the phone
Hello and sorry for the delay! I am on lunch break now. Did you check fuse 31 while it was in place? Meaning when it was inserted.. before pulling it out? Did you use the back side of the fuse and check for voltage on the two small prongs? If so, then they both should have power with the key in the crank position. If not, fuse 31 is bad.
Hello! It's Amedee from just answer. I am just checking in to see how things are going and to see if you need any further assistance? Let me know!