12 volts not getting to coil
09-16-2018, 02:39 PM
#1
Newbie
Thread Starter
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?
What now?
09-16-2018, 05:34 PM
#3
Newbie
Thread Starter
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?
09-16-2018, 07:28 PM
#5
Newbie
Thread Starter
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
Kevin
09-16-2018, 09:09 PM
#6
CF Veteran
Join Date: Jun 2016
Location: Santa Clarita California
Posts: 2,138
Likes: 0
Received 277 Likes
on
243 Posts
Year: 2001
Model: Cherokee (XJ)
Engine: 4.0L
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 .
Last edited by tech; 09-16-2018 at 09:12 PM.
09-17-2018, 05:32 AM
#7
Newbie
Thread Starter
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.
Trending Topics
09-17-2018, 07:13 PM
#8
Newbie
Thread Starter
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
Thans
09-18-2018, 07:42 AM
#9
Senior Member
Join Date: Jul 2011
Location: West Covina, Ca.
Posts: 535
Likes: 0
Received 25 Likes
on
21 Posts
Year: 1988
Model: Cherokee
Engine: 4.0
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.
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.
Last edited by djgrayxj; 09-18-2018 at 07:49 AM.
09-18-2018, 07:59 PM
#10
Newbie
Thread Starter
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
Thanks everyone for the advice that was given. I could not have done it without your help.
Kevin
Thread
Thread Starter
Forum
Replies
Last Post
Klaatu55
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
0
08-18-2018 05:35 PM
ROCKRIDGE 4WD
Vendor Showcase
0
07-12-2018 06:15 PM
Nikolasbarrios
Stock Grand Cherokee Tech. All ZJ/WJ/WK Non-modified/stock questions go here!
4
07-10-2018 02:02 PM
xjvicks
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
11
06-16-2013 07:19 AM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)