'96 Grand, 5.2L. So the other day went to move my Jeep so my friend could wash his truck, Jeep would not start. Just cranked and cranked. Pushed it in the garage and have been going through things. Found no spark coming from the coil. Thought maybe it was the crank sensor so replaced that (btw, if any one knows the engineer that thought up it's position, PM me, I have words for him/her). Still no spark. Checked the dist cap and button since I just need a tune up the week prior, all looked fine. Tried coil off the spare 5.2 that I have at my parents house. Still no spark.
Checked voltage to the coil, I am reading 6-7 volts coming to the coil. I know it should be 12 volts. Checked signal wire with a light up probe and with the probe grounded to the battery, it lights up when you crank the ignition but I was under the impression it was supposed to flash (like a strobe light). I am going to try and trace the wiring back to the PCM for any damage. Is there anything else I should look at? Any one have any idea what wires at the PCM I should check?
I am honestly thinking the PCM took a crap. I had this Jeep do it a few weeks after I bought it and I'm pretty sure it did this very same thing. I was lucky back then I had a spare computer from a '97 that I could use. I don't want to go spending money on a used or reman'd PCM until I at least 95% sure that's what it is.
I'm not in a huge hurry to fix this as I'm temp laid off (due to the virus) but it'd be nice to have it figured out in case I want to go for a Jeep ride or something were to happen to my other two vehicles. Thanks in advance guys!
Checked voltage to the coil, I am reading 6-7 volts coming to the coil. I know it should be 12 volts. Checked signal wire with a light up probe and with the probe grounded to the battery, it lights up when you crank the ignition but I was under the impression it was supposed to flash (like a strobe light). I am going to try and trace the wiring back to the PCM for any damage. Is there anything else I should look at? Any one have any idea what wires at the PCM I should check?
I am honestly thinking the PCM took a crap. I had this Jeep do it a few weeks after I bought it and I'm pretty sure it did this very same thing. I was lucky back then I had a spare computer from a '97 that I could use. I don't want to go spending money on a used or reman'd PCM until I at least 95% sure that's what it is.
I'm not in a huge hurry to fix this as I'm temp laid off (due to the virus) but it'd be nice to have it figured out in case I want to go for a Jeep ride or something were to happen to my other two vehicles. Thanks in advance guys!