Go Back   LS1TECH > LS1-LS2-LS3-LS6-LS7 PERFORMANCE > PCM Diagnostics & Tuning
Sign in using an external account
Register Forgot Password?

PCM Diagnostics & Tuning
HP Tuners | AutoTap | Diablo | MAF Translator | HPP3 | FAST | Gen7 | Big Stuff 3
Sponsored by
Diablo Sport

Low Reference vs. Ground?

Thread Tools Search this Thread
Old 07-31-2007, 08:20 PM   #1
On The Tree
Garage is empty, add now
super_kev's Avatar
Trader Rating: 5
Join Date: Mar 2005
Location: CA
Posts: 166
Default Low Reference vs. Ground?

I'm looking at a '02 Firebird engine coolant temperature sensor/sender wiring diagram, and what's the difference between low reference & ground? For example, a '02 ECT sensor has 5V Reference and Low Reference (both to PCM), whereas the '98 ECT sensor has a 5V Reference and Ground (both to PCM) plus a third wire for the gage.

Is Low Reference considered Ground?
super_kev is offline   Reply With Quote
Old 08-01-2007, 09:18 AM   #2
2002 Chevrolet Camaro
jimmyblue's Avatar
Trader Rating: 11
Join Date: Mar 2002
Location: East Central Florida
Posts: 12,312

The Low Reference is ideally "ground", but it is meant to
be free of any current-loop offsets such as you would
have in an engine block, ground strap, body sheet metal
involved path. Different reading with headlights on and
off, etc., would be bad sometimes. They use it for the
fussier / more critical sensors to take out these kinds of
I*R offsets.

2002 SS convertible

SLP Blackwing lid, 85mm MAF, 85mm Professional Products intake & TB, SLP CME, JBAs/Mufflex tubes . SLP Y, McCord cutout, Fuddle 3500/2.0, GM truck pan, '98 flexplate, 3.42s, T-2R, MAC cover, welded tubes, Hotchkiss PHR, springs; BMR bolt-in LCA brackets, K-member; UMI TA, boxed stock 1LE LCAs, SLP Bilstein / Gabriel air shocks (F/R); Strano 35/22 sway bars, 224/224 116 cam, LT1 rad, HPTuners 12.6@112MPH
jimmyblue is online now   Reply With Quote
Old 08-01-2007, 06:39 PM   #3
On The Tree
Garage is empty, add now
super_kev's Avatar
Trader Rating: 5
Join Date: Mar 2005
Location: CA
Posts: 166

Ok thanks Jimmy.
super_kev is offline   Reply With Quote
Old 08-01-2007, 06:39 PM
Pontiac Firebird

Paid Advertisement

Similar Threads
Thread Thread Starter Forum Replies Last Post
O2 Sensors Wont Work After Conversion... 65ChevyIINova Conversions & Hybrids 13 08-16-2014 08:54 PM
What should the low reference voltage be for the Camshaft position sensor... Lbar PCM Diagnostics & Tuning 3 05-21-2014 04:54 PM
Ls3 map sensor into an f body, will it work? Formula WS6 Conversions & Hybrids 6 01-18-2013 11:33 AM
TAC actuator questions 82swbLQ9 Fueling & Injection 0 12-04-2012 10:29 AM
5v reference question nunan0219 Conversions & Hybrids 1 11-04-2010 05:09 PM

07, diagram, difference, differernce, gm, ground, grounding, low, pcm, reference, refernce, refrence, sensor, whats, 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 On
Refbacks are Off

Join Ls1Tech

All times are GMT -5. The time now is 11:26 PM.

Powered by vBulletin® Version 3.8.7 AC1
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Advertising - Terms of Service - Privacy Statement - JOBS
Emails & Contact Details