Closed Loop -one or two?

Duane357

Original poster
Member
Jan 17, 2012
2
Hello all,
Usually the search function will answer my questions but this time I can't find anything.
I have an old OTC Mindreader scanner which has served me well for a long time, but now have a question for someone.
2002 Trailblazer with inline 6 cylinder.

This scanner has
FSS1
FSS2.

FSS1 always goes into closed loop as it should, while FSS2 always stays in Open loop.
Is it because this is an inline engine and only has one Sensor, or is something else wrong and FSS2 should also go into closed loop?
I've never used the scanner on anything but a v8 or v6 engine in the past.


Thanks for any help

Duane
 

McGMT

Member
Jun 17, 2012
621
Duane357 said:
Hello all,
Usually the search function will answer my questions but this time I can't find anything.
I have an old OTC Mindreader scanner which has served me well for a long time, but now have a question for someone.
2002 Trailblazer with inline 6 cylinder.

This scanner has
FSS1
FSS2.

FSS1 always goes into closed loop as it should, while FSS2 always stays in Open loop.
Is it because this is an inline engine and only has one Sensor, or is something else wrong and FSS2 should also go into closed loop?
I've never used the scanner on anything but a v8 or v6 engine in the past.


Thanks for any help

Duane

Just doesn't apply to our vehicle, nothing to worry about.
 

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