Jeep Repair Problems? Ask a Mechanic for Answers ASAP
hello, The coil will need to be tested for power and spark -- also there is a pick up plate under the distributor cap that controls spark also
have you replaced the automatic shut down relay yet?
now you have narrowed it down to the wiring or the engine controller
now-- we need to check all power and ground to the engine controller to make sure we have it there -- do you have a scan tool -- this way we can see if the computer is responsive
Hi, thank you for choosing Justanswer, I look forward to helping you resolve your issue. Alright lets do this. I am sending you a diagram of the ECU connector. I have highlighted a box in front of the wires I need you to check. One is for power that should be there all the time, one is for power in run or start and two are for grounds. Remove the connector from the ECU to test it. Make sure the battery is at least up to 11.6V. If you have the powers and grounds then I want you to go to the ASD relay, pull it out and check for voltage with the key off, there should be one socket with voltage on it now turn the key to run and there should be two with voltage. I am sending you a diagram of both the PDC and the Junction block. In the junction block check and make sure you have voltage on both sides of fuse 5 and in the PDC make sure you have voltage on both sides of fuse F1. Let me know what you get. .
Power dist. center under hood
Tom, I am sorry but via the contract with justanswer all communications need to be done via this website. The easiest way for you to do these tests is with a test light. There very cheap and you can get one almost at any store. Just hook the alligator clip to the negative battery post when checking for powers and to the positive battery post when checking for grounds.
OK, to make sure we do not cause problems or skip tests and get incorrect results only test what I state to test. First with the ECU only test the four wires I mentioned. Then let me know the results. Remember you will have power all the time on pin 3 and get power on pin 9 with the key in run and/or start and you should have ground on pins 11 and 12. The other grounds you are getting are related to various sensors not the grounding of the ECU.
Now you mentioned you put a fuse in the dome light fuse position. You will notice that there is no fuse position in either of the diagrams I sent you that says dome lights. Now if you are talking about the IOD fuse F8 or F16 you do need fuses there in order to have the ECU control certain items. Let me know what fuse you installed per the diagram and if any other fuses are missing per the diagram.
You also said it fired. What do you mean. Did it start or just pop like it wanted to start? With that fuse in do you have fuel pressure now and spark?