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PASS KEY INSTRUCTIONS
1996-1997
Truck PCM’s do not have any other special procedures, other than idle
relearn. Start, and allow to idle in Park until engine is at normal
operating temperature if desired. This is the same for all trucks,
whether gas or diesel.
Some flash PCM cars do have a passkey relearn, which
will be indicated by a failure to start, or a start and stall problem.
If your ignition key has a 'pellet' in the key, it most likely has an
anti-theft system, and will be either VATS, Passkey 1 or Passkey 2.
1998-2000+
PCM’s will always require an antitheft ‘relearn’ procedure as follows:
(1). Attempt to start vehicle. You MUST rotate the ignition key enough
to try to start the vehicle. Vehicle will briefly start and quit. LEAVE
KEY ON !!
(2). Observe “Security Light”. The Security light may initially flash,
but will remain on steady for a period of 10 minutes, provided you left
the key in the ON position. Some earlier trucks will flash between
'security' and 'battery' in the information center. The battery light
will be the only remaining indicator if this applies to your vehicle,
and will not flash 'security' after 10 minutes. When the security light
goes out (10 minutes have expired), turn the KEY OFF—and wait 5 seconds.
(3). Repeat steps (1) through (2) EXACTLY AS STATED an additional 2 more
times for a total of 3 relearn attempts. Remember to turn the key off
between each of the 3 total relearn attempts as stated in step (2).
(4). Truck or car should start on the 4th attempt, provided
you didn’t make a mistake in one of the 3 prior relearn sequences. This
is a simple procedure, but often done incorrectly.
(5). If there’s no “Check Engine” illuminated, everything is fine. If
the “Check Engine” lamp is on, there may be one additional step which
requires the use of a scan tool, to enable the PCM to know where the
crankshaft sensor is in relation to camshaft. It is totally safe to
drive your vehicle to any repair centre to have this service performed
(a 2-3 minute procedure. 90% of the time, this does not need to be
done). All diagnostics are performed normally with this performance
computer. If you leave your key on (even with
your stock computer), and the battery goes dead--you will have this same
crank procedure relearn needed. The trouble code which sets is P1336,
and P0315 (if newer than 2002).
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