WhiteKnight2
11-14-2015, 10:47 AM
Ok, I have a friends jeep at my house that wont start. I have searched a lot of forums and found similar topics but I wanted to start this because none of the others really finished the thread an I haven't been able to resolve the issue.
He drove to my house in the jeep because we were going to fix the 4x4 linkage. When we figured out the 4x4 linkage was gone, (must have fallen off)we didn't have the parts to replace and it was raining so no pick and pull, we just took care of some other small things. We were going to go to the store and get something (beer) so he tried to start the jeep and it clicked because the battery was dead. I guess the light was on inside because the doors were open the whole time or key was on maybe. Anyway we hooked the battery charger to it and after a min or two tried to start and it would crank but not start. Let it charge for a bit longer and still nothing. I figured the CKS was the culprit because that seems to be the common trend so we ran to the parts store and grabbed one. replaced it and still nothing. So after some t/s I have found the following symptoms:
1. Fuel and Battery Gauges not working.
2. ASD Relay is not contacting. 12v is present but PCM is not grounding Blue/Yellow wire. Position C3 on PCM. The relay did contact yesterday for some reason but the jeep still did not start and fuel pump relay still would not contact. ASD hasn't contacted since.
3. Fuel pump relay not contacting.
4. Coil getting 12v but PCM not grounding.
Ive checked PCM to ground and it has continuity. Ive checked every single fuse including the passenger side kick panel. Ive checked the relays in the PDC. Ive checked the gauges and CCD (think that is what its called) by doing the press odometer reset button turning power on and releasing button to cycle the gauges and they all check out ok. Ive looked at all the wiring connections I could and haven't found a broken/damaged wire. Also checked all the grounds.
My thought is, what "checks" does the computer go through to close the ASD circuit, fuel pump circuit, and coil circuit to ground? maybe a sensor in this circuit is bad and not sending the signal to the PCM to ground these circuits.
I cant really throw money at it by replacing sensors left and right so please help me with advice that is relevant.
Im hoping the PCM isn't bad but it seems weird that the ASD contacted yesterday for a while and hasn't since.
Any advice/help would be awesome.
He drove to my house in the jeep because we were going to fix the 4x4 linkage. When we figured out the 4x4 linkage was gone, (must have fallen off)we didn't have the parts to replace and it was raining so no pick and pull, we just took care of some other small things. We were going to go to the store and get something (beer) so he tried to start the jeep and it clicked because the battery was dead. I guess the light was on inside because the doors were open the whole time or key was on maybe. Anyway we hooked the battery charger to it and after a min or two tried to start and it would crank but not start. Let it charge for a bit longer and still nothing. I figured the CKS was the culprit because that seems to be the common trend so we ran to the parts store and grabbed one. replaced it and still nothing. So after some t/s I have found the following symptoms:
1. Fuel and Battery Gauges not working.
2. ASD Relay is not contacting. 12v is present but PCM is not grounding Blue/Yellow wire. Position C3 on PCM. The relay did contact yesterday for some reason but the jeep still did not start and fuel pump relay still would not contact. ASD hasn't contacted since.
3. Fuel pump relay not contacting.
4. Coil getting 12v but PCM not grounding.
Ive checked PCM to ground and it has continuity. Ive checked every single fuse including the passenger side kick panel. Ive checked the relays in the PDC. Ive checked the gauges and CCD (think that is what its called) by doing the press odometer reset button turning power on and releasing button to cycle the gauges and they all check out ok. Ive looked at all the wiring connections I could and haven't found a broken/damaged wire. Also checked all the grounds.
My thought is, what "checks" does the computer go through to close the ASD circuit, fuel pump circuit, and coil circuit to ground? maybe a sensor in this circuit is bad and not sending the signal to the PCM to ground these circuits.
I cant really throw money at it by replacing sensors left and right so please help me with advice that is relevant.
Im hoping the PCM isn't bad but it seems weird that the ASD contacted yesterday for a while and hasn't since.
Any advice/help would be awesome.