Question about 2001 Toyota Sienna
If I order a replacment part and install it myself. Does the new ECM need to be flashed??
What a great loaded question, 3L V6 and Camry based car.
CE, LE, or XLE?
what new PCM.? what parts changed, list all parts.
the FSM covers this. read it. (extensive it is)
you said new ECM(pcm), well is that from Toyota? or whom.?????
i sure cant guess your PCM source, there are many.
used, new TOY,rebuilt and aftermarket new.
the factory PCM on most cars are slicked, and must be flashed
to your options. and model, in fact this is a top goal of all car makers
1 ECU and fits 100 cars. a dream that is working.....
on a 2001 , well let see.
Federal car or Calif car. 2 ECMs. in usa. (it dont mention flashing)
ouch $700 part.
are you sure its bad, most are, did you know about 85% sent in
are good, owners out $700 .?
got the IMMO option, if yes, it will never run.
immoblizer. RTM read the FSM manual;. its all there.
point 2, and best of all ,why not join a real forum
and get help from folks that deal with all this.
The IMMO rules on most toyotas are the strictist of all cars.
never ever lose the master key or use it for daily use.
now back to the Blue box. P0420
the ECM is not bad for this..
it means the CAT is weak. (or dead)
THE PCM monitors the CAT with a rear 02 sensor
this sensor loose like line, drawn by a drunk man. tiny jiggles
if the cat is bad this sensor B1S2 or B2S2, (do you have 2 sensor 2\'s)
if this O2 jumps widely, this means the cat is bad, its not working
HUGE NASTY SMOG exiting the engine, Engine runs like crap
we fix the engine first. then drive 100mile, in closed loop and bake t
the old cat dry. reset the PCM and see of 420s stop
if not, a new 02 , and or cat.
that is how 420s work. fix 420s DEAD LAST , always.
in shops the just slam in parts, labor is too expensive
but a DIY guy can fix the engine then bake the cat.
it does work , done it many a time.
even with cat full of oil, from a blown engine.
smoked white 20 miles ,then woke up and passed all smog.
tell more, get more.
Posted on Jan 03, 2014
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Posted on Jan 02, 2017
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