Problem with 1999 Jeep Grand Cherokee - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > WJ Grand Cherokee Forum > Problem with 1999 Jeep Grand Cherokee

New Product Release: Flowmaster CA Legal Direct-Fit CatalyPartsHubDirect: Hella LED Lighting, HID Xenon, Headlamps, Hella Rallye 1000 Series 12-Volt/55-Watt Black Magic Halog

Reply
Unread 09-29-2012, 11:21 PM   #1
cwbgg
Registered User
 
Join Date: Sep 2012
Location: Fort Cobb, Oklahoma
Posts: 1
Problem with 1999 Jeep Grand Cherokee

I own a 1999 Jeep Grand Cherokee. About 4 weeks ago I went out to get into the car to drive it and it would not start. It would crank but the engine would not turn over. I had it towed to a Jeep dealership and they called me back to tell me that I had no fuel pressure and suggested replacing the fuel pump. They did that and I drove the Jeep home and it drove perfectly for the next 3 weeks. Went out to start it and same thing exactly as before, would crank but the engine would not start. I had it towed again back to the Jeep dealership and they called me to tell me that the problem was that the PCM was not providing power to the ASD relay to turn on the fuel pump. I questioned them about why they had originally told me that it was the fuel pump since I suspected that the problem the first time was the PCM and they had just misdiagnosed it. They insist that it is a different problem and the two are not related and that a failure of the PCM would not cause no fuel pressure. Can anyone give me more information or opinion as to whether in fact the PCM failure could cause there to be no fuel pressure? Also, I forgot to say that both times that the car would not start we used the key method ourselves to try to get a trouble code and it would not work either the first time or this last time. Thank you for your time and help.

cwbgg is offline   Reply With Quote Quick reply to this message
Unread 10-04-2013, 02:16 PM   #2
grussell
Registered User
2001 WJ 
 
Join Date: May 2013
Location: Longmont, CO
Posts: 381
I am trying to solve my no fuel pressure at the rail. From reading your post I would ask this question. If the dealer said the PCM was not providing power to the ASD relay to turn on the fuel pump, then how would you expect fuel pressure? If the fuel pump will not turn on then it can not create fuel pressure. I would say the dealer is just throwing parts at the problem and the tech does not really know how to diagnose the problem. It is possible that the PCM going bad is coincidental since she ran for a few weeks. I would get a second opinion from a shop that works on Jeeps.
__________________
2001 GC Laredo 4x4 Black
New 4.0 @ 149
grussell is offline   Reply With Quote Quick reply to this message
Unread 10-04-2013, 02:39 PM   #3
99_wj_QD
Registered User
1999 WJ 
 
Join Date: Jan 2012
Location: Chicago, IL
Posts: 63
Im a Technician so I now I can help you out with this problem. From looking at the wiring diagram its easy enough to pin-point the issue. The first thing I would need you to do tho is be able to verify if you are getting fuel pressure, you don't need to crank the engine to build pressure, as soon as the ignition is in the "ON" position it will activate the fuel pump relay. If the dealer just replaced the fuel pump and it is a crank-no-start condition then I can take a shot in the dark and say that it is probably a bad fuel pump relay. Let me know more about the issue.
99_wj_QD is offline   Reply With Quote Quick reply to this message
Unread 10-04-2013, 07:10 PM   #4
Duh
Registered User
 
Join Date: Apr 2002
Posts: 462
Jump the relay to make sure its not a pcm issue. 30 to 87
Duh is offline   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.


Thread Tools


Suggested Threads





Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.