Chrysler 2004 Concorde Service Manual page 260

8E - 14 ELECTRONIC CONTROL MODULES
POWERTRAIN CONTROL MODULE (Continued)
(5) Remove PCM (Fig. 9).
Fig. 9 NGC CONTROLLER
INSTALLATION
The PCM engine control strategy prevents reduced
idle speeds until after the engine operates for 320 km
(200 miles). If the PCM is replaced after 320 km (200
miles) of usage, update the mileage and vehicle iden-
tification number (VIN) in the new PCM. Use the
DRBIII scan tool to change the millage and VIN in
the PCM. If this step is not done a diagnostic trouble
code (DTC) may be set and SKIM must be done or
car will not start if it is a SKIM equipped car. If a
SKIM car you must do a secret key transfer also.
Refer to the appropriate Powertrain Diagnostic Man-
ual and the DRBIII scan tool.
(1) Install PCM. Tighten bolt to 4 N·m (35 in. lbs.)
torque (Fig. 8).
(2) Reposition wiring harness.
(3) Connect the 4 PCM electrical connector (Fig.
7).
(4) Reposition the washer bottle filler neck and
install the bolt.
(5) Connect negative battery cable and reprogram
radio and clock.
(6) Using DRBIII scan tool, program mileage and
vehicle identification number (VIN) into PCM. Refer
to the DRBIII scan tool and the appropriate Power-
train Diagnostic Manual.
SENTRY KEY IMMOBILIZER
MODULE
DESCRIPTION
Fig. 10 SENTRY KEY IMMOBILIZER MODULE
The Sentry Key Immobilizer Module (SKIM) (Fig.
10) contains a Radio Frequency (RF) transceiver and
a central processing unit, which includes the Sentry
Key Immobilizer System (SKIS) program logic. The
SKIS programming enables the SKIM to program
and retain in memory the codes of at least two, but
no more than eight electronically coded Sentry Key
transponders. The SKIS programming also enables
the SKIM to communicate over the Programmable
Communication Interface (PCI) bus network with the
Powertrain Control Module (PCM), and/or the DRB
III scan tool.
OPERATION
The SKIM transmits and receives RF signals
through a tuned antenna enclosed within a molded
plastic ring formation that is integral to the SKIM
housing. When the SKIM is properly installed on the
steering column, the antenna ring is oriented around
the circumference of the ignition lock cylinder hous-
ing (Fig. 11). This antenna ring must be located
within eight millimeters (0.31 inches) of the Sentry
Key in order to ensure proper RF communication
between the SKIM and the Sentry Key transponder.
For added system security, each SKIM is pro-
grammed with a unique "Secret Key" code and a
security code. The SKIM keeps the "Secret Key" code
in memory and sends the code over the PCI bus to
the PCM, which also keeps this code in its memory.
The SKIM also sends the "Secret Key" code to each of
the programmed Sentry Key transponders. The secu-
rity code is used by the assembly plant to access the
SKIS for initialization, or by the dealer technician to
access the system for service. The SKIM also stores
in its memory the Vehicle Identification Number
(VIN), which it learns through a PCI bus message
from the PCM during initialization.
LH