Stock Grand Cherokee Tech. All ZJ/WJ/WK Non-modified/stock questions go here! ZJ (93-98), WJ (99-04), WK (05+)
All ZJ/WJ/WK specific tech questions asked here!

P1388

Old 11-14-2015, 02:07 AM
  #1  
Newbie
Thread Starter
 
Join Date: Nov 2015
Posts: 3
Model: Cherokee
Default P1388

Hello guys have a 2000 Grand Cherokee Dtc P1388. Keeps blowing fuse #26 I power dist box. Cut wire at ecm at C3 pin 12 dg/lg. Fuse does not blow any more. At this point I condemned ecm. Installed another ecm reconnected wire at pin 12 new fuse and it blew again as soon I turned ign switch to on position. Removed wire at pin 12 new fuse turned on ign switch fuse ok. At this point thought I had a bad ecm, point to be considered these ecm's are from a bone yard. I thought I had a defective ecm got another and same thing happens. Now starting to get agitated. Tried these ecms including original which are 3 ecms in total on another vehicle and fuse #26 does not blow. From this good running vehicle tried ecm to troubled vehicle and fuse #26 blows. Doing same testing procedures getting same results. There are lots of blown fuses around and cannot figure out why this is happening. Even bypassed asd relay with jumper wire on terminals #87 to #30 on power dist box eliminating coil side of asd relay circuit and same thing happens. I even created an open in C102 pin #4 which shares power from fuse #26 and still have same issue. I'm lost at this point please help. Never ran into a situation like this and have been doing electrical repairs for some time now. Need help!
Papothetech is offline  
Old 11-15-2015, 10:11 AM
  #2  
CF Veteran
 
Bustedback's Avatar
 
Join Date: Feb 2010
Location: Oroville, CA
Posts: 12,368
Year: 1995
Model: Grand Cherokee
Engine: 4.0 with all of the noise and clatter
Default

What circuit does that fuse protect? The ECM probably isn't the problem, the problem is somewhere in the wire harness.
Bustedback is offline  
Old 11-15-2015, 02:41 PM
  #3  
Newbie
Thread Starter
 
Join Date: Nov 2015
Posts: 3
Model: Cherokee
Default

Originally Posted by Bustedback View Post
What circuit does that fuse protect? The ECM probably isn't the problem, the problem is somewhere in the wire harness.
It protects the ecm
Papothetech is offline  
Old 11-16-2015, 04:51 PM
  #4  
CF Veteran
 
dave1123's Avatar
 
Join Date: Nov 2010
Location: Manlius, east of Syracuse, NY
Posts: 11,299
Year: 2000
Model: Grand Cherokee (WJ)
Engine: 4.0L
Default

According to this, fuse 26 is for the injectors; Also, my book says a code P1388 shows an open or short in the ASD relay circuit.

Last edited by dave1123; 11-16-2015 at 04:57 PM.
dave1123 is offline  
Old 11-16-2015, 10:31 PM
  #5  
Newbie
Thread Starter
 
Join Date: Nov 2015
Posts: 3
Model: Cherokee
Default P1388

Yes thank you. That is true. Have eliminated everything related to that fuse even bypassed asd relay by jumping 87/30 which eliminated coil circuit on asd relay. I cut wire at ecm coming from fuse 26 and short goes away. Eliminating harness, injectors, coil rail and asd relay. Put vehicle in original state with wire cut at ecm no short connect wire back short again. Running out of hair yo pull out of my head. Hate to see this go to junk yard. But made by man should be able to be fixed by man.
Attached Thumbnails P1388-image.png  
Papothetech is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
DirtyKurty
Cherokee Chat
20
11-01-2015 10:36 AM
mmarsh5
Stock Grand Cherokee Tech. All ZJ/WJ/WK Non-modified/stock questions go here!
3
10-29-2015 10:12 AM
bfg111
Stock Grand Cherokee Tech. All ZJ/WJ/WK Non-modified/stock questions go here!
1
10-26-2015 12:43 PM
Matt Krumwiede
Modified XJ Cherokee Tech
8
10-21-2015 10:44 PM
kaonan
Stock Grand Cherokee Tech. All ZJ/WJ/WK Non-modified/stock questions go here!
1
10-19-2015 08:06 AM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 

Thread Tools
Search this Thread
Quick Reply: P1388


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description: