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12 volts not getting to coil
Just bought a 1999 in line 6 Cherokee yesterday,our first Jeep, with 98m miles. Drove it 4 hours home fine. Woke up this morning and the thing would crank over but not start. I did not seem to be getting spark. I pulled the coil and did not have 12 volts at the white wire at the connector to the coil when I turned the power on. The green wire at the connector was hooked to a 12 volt test light and the motor turned over. It momentarily flashed once.
What now? |
Have you checked the auto shut down relay ?
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ASD
Thank you for the reply. I went to NAPA and picked up a new relay. It took a while to figure out if it was the correct one. Pretty sure it is... Just got back and plugged it in and tried to start it. Didn’t work. I had the cover off the relay box and the fuel relay clicked and the ADS clicked too. I next switched fuel and the ADS relay as they were the same. What do you think my next move should be? |
Check the ignition switch and the wiring and plug at the switch .
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I will give the switch some testing tomorrow and report my findings. I feel really bad because I told my wife that this would be a great car for her. Low mileage and it would last forever with the inline motor and it kaputs right away I must save face and get this baby running. Thank you very much for your help. Kevin |
The other part that goes bad bad is the crank sensor . a lot of people say only use a OEM sensor , the one I have in my XJ is from auto zone . It now more then a year old and no problems but I also was reading that STANDARD MOTOR PRODUCTS makes one that works good with our XJ's . hte choice is your's I was just letting you know what other's say . Working out the bugs in these XJ's may take a little but after that they are pretty good .after all your is 19 years old .
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I have read a bunch of other posts in the forum and they have stressed that the electrical grounds must have good contact. I will be working on those today along with the ignition switch. Tech, I saw a video on how to test the crank sensor so that is on my list for today. I will test the crank sensor and clean the grounds first as they seem less intimidating then the ignition switch. I will look at the plugs for the computer module and check for corrosion there too. This should keep me busy for a minute. |
I cleaned all the grounds I could find. Several by the computer. Some under the coil. A few by the pcm unit. There was one on the fire wall too that I cleaned up. The Jeep was cranking well, I cleaned the battery terminals anyway. You can never tell...I did not have time to do the crank sensor today. A job for tomorrow. Thans |
Note from DJ
99 IGNITION COIL OPERATIONS Battery voltage is supplied to the ignition coil positive terminal from the ASD relay. The Powertrain Control Module (PCM) opens and closes the ignition coil ground circuit for ignition coil operation. Base ignition timing is not adjustable on any engine. By controlling the coil ground circuit, the PCM is able to set the base timing and adjust the ignition timing advance. This is done to meet changing engine operating conditions. The ignition coil is not oil filled. The windings are embedded in an epoxy compound. This provides heat and vibration resistance that allows the ignition coil to be mounted on the engine. |
She rides again! The problem was the crank sensor. It was in a very difficult place to to replace. I learned a lot about our new ride. It is the first 4wd we have had. Looking to have some fun times with it. Thanks everyone for the advice that was given. I could not have done it without your help. Kevin |
Note from DJ
Thanks for posting the solution. |
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