Edumucate me on O2 sensors
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Mudding
Joined: Oct 2011
Posts: 162
Likes: 4
From: Brighton, MI
Fix the cooling system problem and get your Tstat put back in. You should get to normal operating temp (180-200) within 5 minutes of driving regardless of ambient temps.
On another note, is the whole open/close loop thing on the UG is backwards and has a lot of people confused. By definition, an open loop controller makes adjustments a setpoint variable (like your air/fuel mix) without feedback (as would be the case when you ECU runs its warm up problem and injects a constant amount of fuel). A closed loop system interprets feedback and automatically adjusts the set point (as the case when the ECU reads your temp/O2 data and makes adjustments to the air/fuel mixture).
You want your truck to run in closed loop at normal operating temps but you will never get there if your ECU thinks you're still in warm up mode.
On another note, is the whole open/close loop thing on the UG is backwards and has a lot of people confused. By definition, an open loop controller makes adjustments a setpoint variable (like your air/fuel mix) without feedback (as would be the case when you ECU runs its warm up problem and injects a constant amount of fuel). A closed loop system interprets feedback and automatically adjusts the set point (as the case when the ECU reads your temp/O2 data and makes adjustments to the air/fuel mixture).
You want your truck to run in closed loop at normal operating temps but you will never get there if your ECU thinks you're still in warm up mode.
I hope to get to the cooling system this weekend but this is not my daily driver so I'm not suffering. Still sucks to take a short run to the shop and burn 4 gals of gas though. I will be most certain to post follow up on all this too.
Thanks again for all the replies, very helpful!
Thread Starter
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Mudding
Joined: Oct 2011
Posts: 162
Likes: 4
From: Brighton, MI
Cheers.
Super Moderator
Joined: Jan 2011
Posts: 16,322
Likes: 88
From: Savannah Georgia
Rover_Hokie,
Follow link in my signature to a cloud stored version of the Bosch ECU manual. Or this link https://www.cubby.com/pl/LR3+worksho...uter%20Manuals
Follow link in my signature to a cloud stored version of the Bosch ECU manual. Or this link https://www.cubby.com/pl/LR3+worksho...uter%20Manuals
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Mudding
Joined: Oct 2011
Posts: 162
Likes: 4
From: Brighton, MI
Put in a stat, about $10 plus gasket.
On the GEMS engine, here is what the ECU book has to say -
P0125 - Engine Coolant Temperature - Warm up time limit, [closed loop fuel] typically 90 seconds at 20oC start temperature
and
On the GEMS engine, here is what the ECU book has to say -
P0125 - Engine Coolant Temperature - Warm up time limit, [closed loop fuel] typically 90 seconds at 20oC start temperature
and
This checks that the engine has gone into closed loop fuelling within a given time, (the engine coolant information is the only sensor it depends upon).
GEMS ECU manual attached, more that most want to know about O2s, codes, etc.
Cheers.
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