A4 Wire Harness Ground Locations - AudiWorld Forums

A4 (B5 Platform) Discussion Discussion forum for the B5 Audi A4 produced from 1995-2001 B5 FAQ
Sponsored by:
Sponsored by:

A4 Wire Harness Ground Locations

Thread Tools Search this Thread
Old 02-25-2010, 05:12 PM   #1
Audiworld Junior Member
Thread Starter
Join Date: Feb 2010
Posts: 30
Default A4 Wire Harness Ground Locations

Ok so all my error's are located on wire d80 on the wire harness. The systems that fall on this line are o2 sensor heaters, egr solenoid and EVAP purge valve. All sensors show 12.XX voltage going to them. I believe this is a ground issue. Besides the ground under the coolant reservoir and the 3 ground's bolted to the intake manifold has anyone ever dissected the wire harness itself? What I am looking for are the locations where there might be ground wires from various sensors soldered to another ground from another system. I need to know which end of the wire harness to start hacking up.

Also I know it is wire harness because replacing the ECU does not solve the issues.

If anyone has any experience dissecting a A4 wire harness let me know please.
thecharlum is offline   Reply With Quote
Old 02-25-2010, 05:47 PM   #2
Tech Guru
4Driver4's Avatar
Join Date: Oct 2002
Posts: 33,497

Don't hack anything up. Get a wiring diagram and ohm out the wires. IIRC, all engine management stuff gets a "virtual ground" at the ECU.
4Driver4 is offline   Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
PARTING OUT 2002 A4 B6 1.8T Cmmartin23 Parts For Sale 26 08-23-2016 04:44 PM
EPC Light on... Coolant Leak ... ECM needs Replacing Audifastdaddy A8 / S8 (D4 Platform) Discussion 10 07-07-2016 04:43 PM
found this while cleaning the car nyrobbie77 A8 / S8 (D2 Platform) Discussion 5 10-02-2015 12:38 PM
temperature dependent O2 sensor iowaan A6 / S6 (C5 Platform) Discussion 17 09-25-2015 01:38 PM
Audi Other FS: New SPC Performance Adjustable Front Control Arms for a multitude of Audis MonSoonHell Parts For Sale 0 09-15-2015 07:14 PM

1999, 20, 28, a4, audi, engine, ground, harness, issues, location, main, tfsi, throttle, wire, wires, wiring

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -8. The time now is 12:45 PM.

  • Ask a Question
    Get answers from community experts
What's your question?