Register Login
Shop4Parts - UK's largest online superstore for FIAT and Alfa Romeo parts
Reply
 
Thread Tools
Old 6 Days Ago   #1
Join Date: Sep 2015
Posts: 199
Thanks: 1
Trader Rating: 0
sandaru has donated!
Sri Lanka 
Lambda sensor closed loop only when manually grounded

Hi my Punto speedgear 2000 is fitted with new cat and new lambda but it does not go closed loop normally and stuck around 0.475 volts with open loop. But when I manually grounded the ground wire from wiring loom it goes closed loop and can see mostly the fluctuations above 0.450 volts. Please advise.
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides

sandaru is offline Reply With Quote Quote 
Old 6 Days Ago   #2
Join Date: Mar 2010
Posts: 123
Thanks: 13
Trader Rating: 0
Hungary 
Re: Lambda sensor closed loop only when manually grounded

Check the ground cables, to the ECU, between battery negative and gearbox, chasis.
Thanks sandaru thanked for this post
Likes sandaru liked this post
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides

kido resuri is offline Reply With Quote Quote 
Old 3 Days Ago   #3
Join Date: Sep 2015
Posts: 199
Thanks: 1
Trader Rating: 0
sandaru has donated!
Sri Lanka 
Re: Lambda sensor closed loop only when manually grounded

Those connections are there and they are very clean with no dirt
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides

sandaru is offline Reply With Quote Quote 
Old 3 Days Ago   #4
Join Date: Mar 2010
Posts: 123
Thanks: 13
Trader Rating: 0
Hungary 
Re: Lambda sensor closed loop only when manually grounded

Try to measure the wires from the ECU to the lambda-sensor. Whites are the heater, you should measure 12V voltage between the two, the grey should be ground and the black is the ECU input.
Thanks sandaru thanked for this post
Likes sandaru liked this post
kido resuri is offline Reply With Quote Quote 
Reply
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

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

Forum Jump
Similar Threads
Thread Thread Starter Forum Replies Last Post
(T) Lambda probe in open loop Modano Tipo (Classic) 7 26-05-2016 17:52
(T) closed loop disable or Lambda value change TurboCinqy1250 Cinquecento / Seicento 13 15-05-2009 20:10
acceleration flat spots & lambda light,....MAF, lambda sensor, fuel pressure regulator,.?? nico FIAT Boo Archives 0 10-07-2008 19:56
(T) lambda sensor open loop ? ycming Cinquecento / Seicento 6 08-06-2007 20:24