How do I clear EVAP I/M monitor, w zero DTC codes showing

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04-05-2012, 04:50 PM

8car2002

Thread Starter

Join Date: May 2010

Location: The Valley in California

Posts: 25

How do I clear EVAP I/M monitor, w zero DTC codes showing

I started off with P420 code, replaced the O2 sensor, no changes, next replaced the CAT, then P420 code went away, but the I/M Monitor for the O2 and Evap came on, say 2 incomplete and 6 ready. Smog guy said to add more gas and may change the cap too and drive it longer, so i did it all and the O2 I/M Monitor went away, so now at 1 inc and 7 ready. How do i get the EVAP I/M monitor to show ready? It doesn't work to just clear the codes on the OBD II scanner for I/M monitors...How long do is a drive cycle for EVAP to show ready? Disconnect Battery? How long?
2002 MCSS
Thanks,

Evaporative System Monitor
Ready
Vehicle was driven enough under proper conditions to
complete the monitor.
Inc
(Incomplete) - Vehicle was not driven enough under
proper conditions to complete the monitor.

04-06-2012, 06:40 AM

03SSLE

Monte Of The Month -- August 2012

Join Date: Apr 2011

Location: Seattle

Posts: 6,074

In order for all monitors to be placed into the ready state a drive cycle fitting all the following criteria must be met:

General Motors Driving Cycle

Hope this helps...