Posted to Technical Tips Forum on 3/27/2013
05 Corolla used PCM install
We were asked to "program" a used PCM for this 05 Corolla
1ZZ-FE by a local shop. He had been fighting a P0353 (?) and
was sure that the issue was related to a faulty PCM. The car
had 195K miles on it so it was not covered under the
emissions warranty. He had already plugged in the used box
and found the typical start/stall when a car is immobilized.
I asked him to leave me all the keys in case I had to
relearn them all.
After reading about the procedure to erase and relearn keys
and not having an LSID, I figured I was gunna reach a dead
end as I wouldn't be able to get a seed number in a timely
After some head-scratching and failed attempts at writing
the car's VIN to the used PCM, I was about to give up when
iATN member Harv Chan sent me this:
"You don't need to learn the keys to the PCM. This
vehicle should have a Transponder ECU that has learned the
keys. All you need to do is the handshake between the PCM
and the Transponder Key ECU. Jump DLC pins #13 to #4 for
over 30 minutes. Be sure to cycle the key afterwards.
You don't need to re-seed for a used PCM on this model.
You were also told correctly about programming the VIN into
the PCM. You can do this with Techstream or any Snap On tool
with a recent version installed. Having the right VIN is
necessary for IM testing."
The failed VIN write turned out to be an issue with
TechStream when using a Cardaq+ interface. Using a
Mastertech with Toyota card made that possible. Once the VIN
was correct and the 30+ minute procedure was complete, I
shut the ignition off, removed the jumper from the DLC, and
it started up on all 3 keys. I had tried the 30+ min thing
before correcting the VIN and was unsuccessful.
BTW, this is the same procedure as Toyota shows for a new
PCM replacement. Go figure.
Tip o' the hat to Harv for coming to my rescue.
Rusty from Massachusetts
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