How long would it take a pcm to
 

Ok i brought my dads 1997 s10 pickup for an emissions inspection and it failed

I hooked the truck up to a scan tool and it dosnt see the egr moniter and the oxygen heater moniter

after i brought the truck home my dad forgot to tell me he cleared a code last week

SO the pcm didnt see the sensors yet ? how long would it take it to see them ? :icon_shrug:

I just drove the truck 75 miles the passed 2 days but still there incomplete

You have to run through a full drive cycle. You could drive it 300 miles and you still may not have complete tests for those systems. Specific things need to happen for a successful drive cycle.

Google "GM Drive Cycle" and you should find more than enough information.

thanks kyle

google here i come :icon_google:



Edit: i found this http://www.obdii.com/drivecycle.html tomorrow morning this will be done on the way to work

That's handy to know!

Wow..i didnt know that needed to be done. i figured clearing the computer,then driving it for 20 min was good enough for it to relearn.


How about obd 1 computers?

thats what my dad thought and when it failed i was like wtf ??

Ok today I did what the link above told me to do

the egr valve got recognized

Now i need to get the oxygen sensor heater to complete its self
and the evap moniter

any ways ill be on google but im open to suggestions

If those are the only monitors showing not ready your OK.

1996-2000 vehicles can have 2 monitors that are not ready and still pass.
2001-Up can only have 1 not ready.

alrighty i guess ill take it in tomorrow morning

hey guys Ive been doing more studying on drive cycles

and most of them say this

NOTE: The ignition key must not be on prior to the cold start otherwise the heated oxygen sensor diagnostic may not run.

I dont get it do i just turn the key to start it ? Like just crank it on 1st turn with out pausing ?