WEIRD O2 sensor problem...
Thread Starter
Racer
Joined: Nov 2002
Posts: 471
Likes: 0
From: Queens NY
WEIRD O2 sensor problem...
The car won't go into closed loop anymore..
I put the scanner on, and the O2 readings are stuck at .450
I unplug the O2 sensor wire, STILL stuck at .450, and NO SES light!
WTF??
I put the scanner on, and the O2 readings are stuck at .450
I unplug the O2 sensor wire, STILL stuck at .450, and NO SES light!
WTF??
Team Owner
Joined: Mar 2000
Posts: 83,381
Likes: 87
From: Boston, MA
Re: WEIRD O2 sensor problem... (CarAteMyMoney)
What was the coolant temp at startup? How long was the engine running in minutes when you saw this? Personally if I saw a static reading on the O2 in open or closed loop I'd be replacing it.
Thread Starter
Racer
Joined: Nov 2002
Posts: 471
Likes: 0
From: Queens NY
Re: WEIRD O2 sensor problem... (scorp508)
The coolant temp read 88 or so degrees after it had been running for half an hour or so..
.. what's weird is while I have a static reading on the O2 sensor, I have that same static reading whether it's plugged in or not! :banghead:
.. what's weird is while I have a static reading on the O2 sensor, I have that same static reading whether it's plugged in or not! :banghead:
Melting Slicks
Joined: Jan 2000
Posts: 3,418
Likes: 1
From: NW Chicago Suburbs
Re: WEIRD O2 sensor problem... (CarAteMyMoney)
The car won't go into closed loop anymore...WTF??
Eric
Le Mans Master
Joined: Nov 2002
Posts: 7,179
Likes: 2
From: Charlotte, NC
Re: WEIRD O2 sensor problem... (silver & red CE)
if I remmber correctly that is the reference voltage the ECM puts out.. so that is probably normal.. once it's in closed loop you will see the voltage fluxuate.. if not the o2 is junk.. also you should see an O2 fluxuate voltage even unplugged after the O2 is at running temp because it is a voltage generator.. but it must be HOT...
-Rick
-Rick
Thread Starter
Racer
Joined: Nov 2002
Posts: 471
Likes: 0
From: Queens NY
Re: WEIRD O2 sensor problem... (Nathan Plemons)
isnt it supposed to throw some kind of code when the O2 sensor isnt completing the circuit???
besides, even when its in open loop, the O2 sensor should send numbers back to the ECM even though its not taking them into account until it reaches closed loop
besides, even when its in open loop, the O2 sensor should send numbers back to the ECM even though its not taking them into account until it reaches closed loop
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