Autonerdz Home Autonerdz FAQ Userís Comments Autonerdz Events Autonerdz Store Contact Autonerdz
 
  Welcome, Guest. Please Login or Register
Autonerdz - Since 2000, North America's Authority on PicoScope
 
  HomeHelpSearch Member Map Event CalendarRegisterLogin  
 
O2 Relationships (Read 5,420 times)
Tom Roberts
Autonerdz Administrator
Picogroup
*****
Offline


Autonerdz

Posts: 7,945

Olympia, WA, Washington, USA
Olympia, WA
Washington
USA

Gender: male
O2 Relationships
Apr 30th, 2005 at 9:24pm
 
Victim:  2001 Ford Windstar 3.8
Capture:  All four O2 sensors
Scope:  Pico 3423 on a USB 1.1 PC
Method:  Filtered Save On Trigger Session @32k samples per channel
Conditions:  From start idling ending with a throttle snap

Here is the series:

...

...

...

...

...

...

...

Back to top
 

Tom Roberts
Forums Administrator
http://www.autonerdz.com
WWW WWW autonerdz autonerdz  
IP Logged
 
Carl Grotti
LSD Guide
Picogroup
*****
Offline


Deceased

Posts: 1,501

Re: O2 Relationships
Reply #1 - May 1st, 2005 at 7:07am
 
Hi Tom,

It appears you are triggering off of the noise, but we don't see it because you have the low-pass filter turned on. Is that correct?

The O2s wake up pretty quick don't they? An open heater circuit would show up very easily.
Back to top
 

Carl Grotti
Forum Moderator
carl_grotti carl_grotti  
IP Logged
 
Tom Roberts
Autonerdz Administrator
Picogroup
*****
Offline


Autonerdz

Posts: 7,945

Olympia, WA, Washington, USA
Olympia, WA
Washington
USA

Gender: male
Re: O2 Relationships
Reply #2 - May 1st, 2005 at 7:31am
 
Hi Carl,

Yes, it's triggering off of invisible noise.  The low pass filter has cleaned it up quite nicely.

The engine was not stone cold, but had been sitting for a while before this start up.  The O2s wake up very fast and are in closed loop in about 10 seconds.

BTW, the PCM was the test point.  Accessing the O2 connectors on this would be a nightmare.
Back to top
 

Tom Roberts
Forums Administrator
http://www.autonerdz.com
WWW WWW autonerdz autonerdz  
IP Logged