Sec Air System test, Drive Cycle question

[mattt]

Have an '01 with a 4.8 that just refuses to run the Sec Air System test after a battery replacement. Will the Sec Air System test ONLY run and complete if the A/C is functional and turned on? Haven't turned A/C on because there is no refrigerant left.

What specific step in the Drive Cycle would activate the Sec Air System test?

 

[SLCHOE]

A/C has nothing to do with the drive cycle. You may have a pending code. A pending code wont turn on the MIL (check engine light) but it WILL stop any further monitors from running from that point on. I'd check that first.

 

[mattt]

I've plugged in multiple times and had zero soft codes(no CEL) and zero hard codes(CEL on). I'd say I've hit all the test conditions. Puzzling.....