S70 check engine light and battery removal

My battery was disconnected to do some maintenance, one of which was the
replacement of my SAS valve/air pump, which triggered the Check Engine
light. So far, the light hasn't come back on yet after 150 miles and a
week of driving. Is that sufficient mileage / car starts to be confident
that the Check Engine light won't come back on?

 

The air pump system is tested after the car is fully warmed up, when the
engine is at idle. This takes about 30 seconds of idling, during which
time the test is aborted or not started if the A/C comes on or is on.
The test is also aborted if you come off idle. So if you're in a warm
area where the A/C is always on, or not doing the type of driving where
you are sitting at idle for a period of time, then the test may not have
been run yet.

Note that it is only run once per trip, and 2? aborts will cancel any
attempts for the rest of that trip. Also, other systems are tested
during the above conditions, so this test doesn't happen every time.

Some OBD-II testers will also indicate "readiness codes" - once each
test is passed, the code for that test is changed from not ready to
ready. After a long battery disconnection, all of these are set to not
ready. This is how some jurisdictions test emissions through the OBD-II
port - all readiness codes must be set, and the check engine light off.
This is a bit of a snakebite, as people get check engine light problems
fixed, then get their emission check done - without allowing time for
the readiness codes to be set.

--
Mike F.
Thornhill (near Toronto), Ont.

Replace tt with t (twice!) and remove parentheses to email me directly.
(But I check the newsgroup more often than this email address.)

 

I went to get my Texas inspection/emissions test today. They couldn't read
my OBDII, and the guy at the shop said that Texas sent out some notice
saying the machines have communications problems with some Volvos. They
were supposed to, at that point, do the emissions test the old fashioned
way, but the dumb machine registered a "Bench Failure" after a 30 minute
warmup period.

Any similar stories out there with S70's and emissions testing?

 

Yay, I finally passed my inspection today. This was my 4th visit to a test
center, and this was the 3rd type of machine I've seen. The 1st two
machines were the same and looked old. They had OBDII testing + the dyno
test. The 3rd type was just OBDII, and the latest was OBDII + dyno.

Today, the car didn't pass the OBDII test, and the guy said that it was
not a surprise. However, his computer went to the "ASM" dyno test just
fine, whereas the first two test centers just gave "communication
failure". No problems passing the test today.

In case you're in Houston, TX and need to find a test facility, I highly
recommend the Mobil gas station at the intersection of Dairy Ashford and
Memorial Drive on the west side of town. Kudos to the "Volvo of Houston"
people for recommending them.

Mike