Closed Loop
Race Director
Joined: Feb 2004
Posts: 12,518
Likes: 19
Thread Starter
Team Owner
Joined: Oct 2004
Posts: 35,065
Likes: 0
From: Bergen County, NJ Democrats, doing for the country what they did for Michigan
Thread Starter
Team Owner
Joined: Oct 2004
Posts: 35,065
Likes: 0
From: Bergen County, NJ Democrats, doing for the country what they did for Michigan
I put in a heated 02 sensor. When 65Z01 ran a scan we were not getting activity from the O2 sensor and the voltage was .04V, not the .8-.9 we would expect to see. Plus there was no other O2 activity.
So I said fk it. I put the stock one back in the collector and I want to see if I'm going into closed loop.
I ordered the cable to interface to the ECM. I have also downloaded Datamaster which gives 20 free records.
However, I don't have that stuff yet and I wanted to see if the car is going into closed loop today.
So I said fk it. I put the stock one back in the collector and I want to see if I'm going into closed loop.
I ordered the cable to interface to the ECM. I have also downloaded Datamaster which gives 20 free records.
However, I don't have that stuff yet and I wanted to see if the car is going into closed loop today.
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Put the ECM into field service mode and watch the SES flases:
-jumper ALD A&B (upper right) with a paperclip
-start the engine and wait a copla mintues
-the SES flash rate will drop from 2Hz to 1Hz when it enters closed loop mode; this takes a set time, coolant temp high enough and the O2 sensor working
-the On & Off duration will tell if it's running rich or lean
-jumper ALD A&B (upper right) with a paperclip
-start the engine and wait a copla mintues
-the SES flash rate will drop from 2Hz to 1Hz when it enters closed loop mode; this takes a set time, coolant temp high enough and the O2 sensor working
-the On & Off duration will tell if it's running rich or lean
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Yea, I just wanted to step by step thing to be sure the ign. is off before inserting the paper clip.
The SES On duration indicates Rich condition; the Off duration indicates Lean condition. So 1Hz flashes of equal duration measn she's closed loop at stoch A/F ratio.
This test info is from Ben Watson's book on Chevy FI, ISBN 0-7603-0422-X.
The SES On duration indicates Rich condition; the Off duration indicates Lean condition. So 1Hz flashes of equal duration measn she's closed loop at stoch A/F ratio.
This test info is from Ben Watson's book on Chevy FI, ISBN 0-7603-0422-X.
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Melting Slicks
Joined: Jul 2004
Posts: 2,695
Likes: 0
From: Chicago Illinois
After my H/C swap I put in headers with heated O2s. Datamaster showed only one side was working properly. I checked all the wiring and connections and couldnt seem to get the one O2 to read as fast as the good one. I put in a 1 wire O.E O2 on the side that wasnt working properly. Bingo! It only takes one side to trigger Closed loop. In theory since the O2 signals go back to the ecm, it should only take one to activate closed loop. FYI
Thread Starter
Team Owner
Joined: Oct 2004
Posts: 35,065
Likes: 0
From: Bergen County, NJ Democrats, doing for the country what they did for Michigan
After my H/C swap I put in headers with heated O2s. Datamaster showed only one side was working properly. I checked all the wiring and connections and couldnt seem to get the one O2 to read as fast as the good one. I put in a 1 wire O.E O2 on the side that wasnt working properly. Bingo! It only takes one side to trigger Closed loop. In theory since the O2 signals go back to the ecm, it should only take one to activate closed loop. FYI