Commander 4WD V8-4.7L VIN N (2006)
PCM over the CAN data bus. If the response received identifies the key as invalid or if no response is received from the key transponder, the SKREEM
sends an invalid key message to the PCM. The PCM will enable or disable engine operation based upon the status of the SKREEM messages. It is
important to note that the default condition in the PCM is an invalid key; therefore, if no message is received from the SKREEM by the PCM, the engine
will be disabled and the vehicle immobilized after two seconds of running.
The SKREEM also sends security indicator status messages to the EMIC over the CAN data bus to tell the EMIC how to operate the security indicator.
The security indicator status message from the SKREEM tells the EMIC to turn the indicator on for about three seconds each time the ignition switch is
turned to the ON position as a bulb test. After completion of the bulb test, the SKREEM sends security indicator status messages to the EMIC to turn the
indicator off, turn the indicator on, or to flash the indicator on and off. If the security indicator flashes or stays on solid after the bulb test, it signifies a
SKIS fault. If the SKREEM detects a system malfunction or the SKIS has become inoperative, the security indicator will stay on solid. If the SKREEM
detects an invalid key or if a key transponder- related fault exists, the security indicator will flash. If the vehicle is equipped with the Customer Learn
transponder programming feature, the SKREEM will also send messages to the EMIC to flash the security indicator whenever the Customer Learn
programming mode is being utilized.
The SKIS performs a self-test each time the ignition switch is turned to the ON position, and will store fault information in the form of a Diagnostic
Trouble Code (DTC) in SKREEM memory if a system malfunction is detected. The SKREEM can be diagnosed, and any stored DTC can be retrieved
using a diagnostic scan tool.
