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Former '05er
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12,467 Posts
It's typical, and I still haven't heard a good argument for why this is.
 

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Former '05er
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12,467 Posts
Page 05-45 Volume 1 FSM:

3. CLEAR DTC (Without using a hand-held tester or OBDII scan tool)

(a) Perform either one of the following operations.

(1) Disconnect the negative battery cable for more than 1 minute.

(2) Remove the EFI and ETCS fuses from the Relay Block (R/B) located inside the engine compartment for more than 1 minute.

NOTICE: When disconnecting the battery cable, perform the INITIALIZE procedure (see page 05-1).
 

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Former '05er
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12,467 Posts
Resetting is usually a good idea after any mod. It lets the engine start at factory base numbers and then it learns from there. Once you've given it a few key cycles to relearn what normal is, it's a good idea to use a scan tool and check for codes and any other information your tool provides. On the OBDI ECMs you check the Vf voltage to see how much the ECM trimmed your fuel to bring it into "normal". Some of the OBDII ECMs also have a Vf terminal, but I haven't looked on the tC. Then you've got some idea what really happened when you did the mod.
 

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Former '05er
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12,467 Posts
It doesn't matter. The ECM is smarter than you might like to think.
 
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