Hi all, I have searched the forum as much as I possibly can, and still haven't been able to solve my problem. I have had an intermittent no crank/start/gauges problem for 6 months. The jeep would be fine for 2 days, sometimes 2 weeks, and even up to a month, and then it would give me the no crank, start etc... I could swap the relays around wiggle the harness remove fuses etc along with a couple of hundred key cycles and it would start and run again fine. I haven't been able to get it to start for two weeks now....ugh!
I have tested and charged the battery numerous times, and the starter. They check out ok. I do not get voltage at the solenoid from the ignition with the key in the start position. I can crank the engine by crossing the posts on the starter, it doesn't start. I can crank the engine by jumpering 12 volts to the 30 terminal on the PDP for the starter relay. (I get 12 volts on the 86 or 87 terminal when the ignition is in the start position.) It still will not start. I have taken apart the ignition, and there is nothing wrong with the actuator pin or any of the parts around or in it. I have 12 volts on the pk/or wire on pinout 30 on PCM module 1 connector with the ignition in the start position.
I have removed all of the grounds, sanded the connector eye, and the surfaces they touch...engine block, firewall, hood, etc... I also have continuity from the battery ground clamp to everything...block firewall, hood, starter, alternator etc...
I cannot get any codes, the scanner just keeps telling me to turn on the ignition to establish communication.....grrrrrr!
The ammeter always blips a little and shows about 9 volts if anything at all, and the fuel gauge shows empty with the low fuel light when it won't start. I'm pretty sure the PCM is just simply not turning on.
I have also gone through every pin on all 4 PCM modules and noted voltage if any, in both the run and start positions. The problem is I'm not sure what should have power, and what shouldn't.
I have removed all of the tapes and loom on the PCM plugs back to the center of the firewall to inspect the splices, so far everything looks good.
Is my PCM junk? Should I just light the thing on fire and watch it burn!? I'm at my wit's end, any help would be greatly appreciated.
thanks in advance,
Jake
I have tested and charged the battery numerous times, and the starter. They check out ok. I do not get voltage at the solenoid from the ignition with the key in the start position. I can crank the engine by crossing the posts on the starter, it doesn't start. I can crank the engine by jumpering 12 volts to the 30 terminal on the PDP for the starter relay. (I get 12 volts on the 86 or 87 terminal when the ignition is in the start position.) It still will not start. I have taken apart the ignition, and there is nothing wrong with the actuator pin or any of the parts around or in it. I have 12 volts on the pk/or wire on pinout 30 on PCM module 1 connector with the ignition in the start position.
I have removed all of the grounds, sanded the connector eye, and the surfaces they touch...engine block, firewall, hood, etc... I also have continuity from the battery ground clamp to everything...block firewall, hood, starter, alternator etc...
I cannot get any codes, the scanner just keeps telling me to turn on the ignition to establish communication.....grrrrrr!
The ammeter always blips a little and shows about 9 volts if anything at all, and the fuel gauge shows empty with the low fuel light when it won't start. I'm pretty sure the PCM is just simply not turning on.
I have also gone through every pin on all 4 PCM modules and noted voltage if any, in both the run and start positions. The problem is I'm not sure what should have power, and what shouldn't.
I have removed all of the tapes and loom on the PCM plugs back to the center of the firewall to inspect the splices, so far everything looks good.
Is my PCM junk? Should I just light the thing on fire and watch it burn!? I'm at my wit's end, any help would be greatly appreciated.
thanks in advance,
Jake
