Chrysler PT Cruiser. Manual — part 475
work with the vehicle. The
9Secret Key9 code is there-
fore a common element found in all components of
the Sentry Key Immobilizer System (SKIS). In the
event that a SKIM replacement is required, the
9Secret Key9 code can be restored from the PCM by
following the SKIM replacement procedure found in
the DRB III
t scan tool. Proper completion of this
task will allow the existing ignition keys to be repro-
grammed. Therefore, new keys will NOT be needed.
In the event that the original
9Secret Key9 code can
not be recovered, new ignition keys will be required.
The DRB III
t scan tool will alert the technician if
key replacement is necessary. Another security code,
called a PIN, is used to gain secured access to the
SKIM for service. The SKIM also stores in its mem-
ory the Vehicle Identification Number (VIN), which it
learns through a bus message from the PCM during
initialization. The SKIS scrambles the information
that is communicated between its components in
order to reduce the possibility of unauthorized SKIM
access and/or disabling.
OPERATION
When the ignition switch is moved to the RUN
position, the SKIM transmits an RF signal to the
transponder in the ignition key. The SKIM then
waits for a response RF signal from the transponder
in the key. If the response received identifies the key
as valid, the SKIM sends a
9valid key9 message to
the PCM over the PCI bus. If the response received
identifies the key as invalid or no response is
received from the transponder in the ignition key, the
SKIM sends an
9invalid key9 message to the PCM.
The PCM will enable or disable engine operation
based upon the status of the SKIM messages. It is
important to note that the default condition in the
PCM is
9invalid key.9 Therefore, if no response is
received by the PCM, the engine will be immobilized
after two (2) seconds of running.
The SKIM also sends indicator light status mes-
sages to the instrument cluster to tell that module
how to operate the light. This may consist of turning
the light ON for a three (3) second bulb test when
the ignition switch is first turned to the ON position.
It is also the method used to turn the light ON solid
or to flash it after the indicator light test is complete
to signify a fault in the SKIS. If the light comes ON
and stays ON solid after the indicator light test, this
signifies that the SKIM has detected a system mal-
function and/or that the SKIS has become inopera-
tive. If the SKIM detects an invalid key OR a key-
related fault exists, the indicator light will flash
following the indicator light test. The SKIM may also
request an audible chime if the customer key pro-
gramming feature is available and the procedure is
being utilized. Refer to Electrical, Vehicle Theft Secu-
rity, Transponder Key, Standard Procedure - Sentry
Key Immobilizer System Transponder programming.
STANDARD PROCEDURE - SENTRY KEY
IMMOBILIZER SYSTEM INITIALIZATION
The Sentry Key Immobilizer System (SKIS) initial-
ization should be performed following a Sentry Key
Immobilizer Module (SKIM) replacement. It can be
summarized as follows:
(1) Obtain the vehicle’s unique four-digit PIN
assigned to its original SKIM from the vehicle owner,
Fig. 24 SENTRY KEY IMMOBILIZER MODULE
Fig. 25 SENTRY KEY IMMOBILIZER MODULE
LOCATION
1 - STEERING COLUMN
2 - SKIM ELECTRICAL CONNECTOR
3 - SKIM
8E - 16
ELECTRONIC CONTROL MODULES
PT
SENTRY KEY IMMOBILIZER MODULE (Continued)
the vehicle’s invoice, or from Chrysler’s Customer
Center.
(2) Using a DRB III
t scan tool, select 9Theft
Alarm,
9 9SKIM,9 9Miscellaneous,9 and then 9SKIM
Module Replaced.
9
(a) Enter Secured Access Mode using the unique
four-digit PIN.
(b) Program the vehicle’s VIN number into the
SKIM’s memory.
(c) Program the country code into the SKIM’s
memory (for North America, choose US or domes-
tic).
(d) The vehicle’s unique Secret Key data will be
retrieved from the PCM automatically. If this data
is corrupt or not present, you will be prompted to
cut new keys for this vehicle.
(3) Program all customer keys into the SKIM’s
memory.
This process will require that the SKIM to be in
the Secured Access Mode. The PIN must be entered
into the DRB III
t scan tool before the SKIM will
enter the Secured Access Mode. Once entered,
Secured Access Mode shall be active until 60 seconds
after the last command requiring secured access was
received and acknowledged.
Two exceptions to this rule are:
• When you have used the ’erase all keys’ com-
mand OR
• When you have just programmed a new key.
If either of these functions are performed success-
fully while in the Secured Access Mode, this mode
will be exited immediately following the function.
NOTE: If a PCM is replaced, the unique ’Secret Key’
data must be transferred from the SKIM to the new
PCM using the PCM replacement procedure. This
procedure requires the Secured Access Mode as
well and can be found in the DRB III
T
scan tool.
REMOVAL
(1) Disconnect and isolate the battery negative
remote cable.
(2) Remove Lower Instrument Panel Cover. Refer
to Body, Instrument Panel, Lower Instrument Panel
Cover, Removal.
(3) Remove the steering column upper and lower
shrouds. Refer to Steering, Column, Column Shroud,
Removal.
(4) Disengage the steering column wire harness
from the Sentry Key Immobilizer Module (SKIM)
(Fig. 26).
(5) Remove the two screws securing the SKIM to
the top of the steering column (Fig. 26).
(6) Rotate the SKIM and its mounting bracket
upwards and then to the side away from the steering
column to slide the SKIM antenna ring from around
the ignition switch lock cylinder housing (Fig. 26).
(7) Remove the SKIM from the vehicle.
INSTALLATION
NOTE: If the SKIM is replaced with a new unit, a
DRB lll
T
scan tool MUST be used to initialize the
new SKIM and to program at least two Sentry Key
transponders (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/SENTRY KEY IMMO-
BILIZER MODULE - STANDARD PROCEDURE).
(1) Place the SKIM into position.
(2) Rotate the SKIM and its mounting bracket
downwards and then to the side towards the steering
column (Fig. 26).
(3) Install the two screws securing the SKIM to
the top of the steering column (Fig. 26).
(4) Engage the steering column wire harness to
the Sentry Key Immobilizer Module (SKIM) (Fig. 26).
(5) Install the steering column upper and lower
shrouds. Refer to Steering, Column, Column Shroud,
Installation.
(6) Install the Lower Instrument Panel Cover.
Refer to Body, Instrument Panel, Lower Instrument
Panel Cover, Installation.
(7) Connect the battery negative cable.
Fig. 26 SENTRY KEY IMMOBILIZER MODULE (SKIM)
REMOVE/INSTALL
1 - IGNITION KEY CYLINDER
2 - STEERING COLUMN
3 - SENTRY KEY IMMOBILIZER MODULE (SKIM)
4 - SKIM CONNECTOR
5 - SKIM ANTENNA
PT
ELECTRONIC CONTROL MODULES
8E - 17
SENTRY KEY IMMOBILIZER MODULE (Continued)
ENGINE SYSTEMS
TABLE OF CONTENTS
page
page
STARTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
BATTERY SYSTEM
TABLE OF CONTENTS
page
page
BATTERY SYSTEM
. . . . . . . . . . . . . . . . . . . . . . . . . . 2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
DIAGNOSIS AND TESTING - BATTERY
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
. . . . . . . . . . . . . . . . . . . . . . . . . . . 5
. . . . . . . . . . . . . . . . . . . . . . 6
BATTERY
. . . . . . . . . . . . . . . . . . . . . . . . . . 7
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
DIAGNOSIS AND TESTING - BATTERY
STANDARD PROCEDURE - SPIRAL PLATE
BATTERY CHARGING . . . . . . . . . . . . . . . . . . . 9
CONVENTIONAL BATTERY CHARGING . . . . 10
STANDARD PROCEDURE - USING MICRO
BATTERY TESTER . . . . . . . . . . . . . . . . . 12
STANDARD PROCEDURE - OPEN-CIRCUIT
VOLTAGE TEST . . . . . . . . . . . . . . . . . . . . . . . 13
STANDARD PROCEDURE - IGNITION-OFF
DRAW TEST . . . . . . . . . . . . . . . . . . . . . . . . . 13
INSTALLATION - GASOLINE ENGINE
BATTERY HOLDDOWN
. . . . . . . . . . . . . . . . . . . . . . . . . 18
. . . . . . . . . . . . . . . . . . . . . . . . . . . 18
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
. . . . . . . . . . . . . . . . . . . . . . . . . 19
BATTERY CABLES
. . . . . . . . . . . . . . . . . . . . . . . . . 19
. . . . . . . . . . . . . . . . . . . . . . . . . . . 19
DIAGNOSIS AND TESTING - BATTERY
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
. . . . . . . . . . . . . . . . . . . . . . . . . 21
BATTERY TRAY
. . . . . . . . . . . . . . . . . . . . . . . . . 21
. . . . . . . . . . . . . . . . . . . . . . . . . . . 21
INSTALLATION - GASOLINE ENGINE
THERMAL GUARD
. . . . . . . . . . . . . . . . . . . . . . . . . 22
. . . . . . . . . . . . . . . . . . . . . . . . . . . 22
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
. . . . . . . . . . . . . . . . . . . . . . . . . 23
BATTERY TRAY SUPPORT BRACKET
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
. . . . . . . . . . . . . . . . . . . . . . . . . 23
PT
ENGINE SYSTEMS
8F - 1
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