Grand Cherokee 2WD V6-3.7L (2008)
Engine Control Module: Testing and Inspection
SKREEM Programming
SKREEM PROGRAMMING
When a Powertrain Control Module (PCM) for a gasoline engine, or an Engine Control Module (ECM) for a diesel engine and the Sentry Key Remote
Entry Module (SKREEM) (also known as the Wireless Control Module/WCM) on vehicles equipped with the Sentry Key Immobilizer System (SKIS)
are replaced at the same time, perform the following steps in order:
NOTE: If the PCM and the SKREEM are replaced at the same time, program the PCM VIN into the PCM first.
1. If applicable first replace the PCM/ECM with the original WCM still connected to the vehicle.
2. Using the appropriate service information program the new PCM/ECM. (This will ensure the Secret Key Transfer from the original WCM into the
new PCM/ECM).
3. Now replace and program the WCM. This will retain the Secret Key from the PCM/ECM back into the new WCM.
4. With the scan tool, select Miscellaneous Functions, WCM/Wireless Control Module. Then select the desired procedure and follow the display on
the scan tool.
5. If the vehicle is equipped with Tire Pressure Monitoring System program the Placard Pressure Values into the WCM/SKREEM.
6. Ensure all the customer's keys have been programmed into the new module if necessary.
NOTE: If the original keys do not successfully program to the new SKREEM after the proper procedures are followed correctly,
programming new keys will be necessary.
PROGRAMMING THE SKREEM
The SKIS Secret Key is an ID code that is unique to each SKREEM/WCM. This code is programmed and stored in the SKREEM/WCM, the
PCM/ECM, and each ignition key transponder chip. When the PCM/ECM or SKREEM/WCM is replaced, it is necessary to program the Secret Key into
the new module using a diagnostic scan tool. Follow the programming steps outlined in the diagnostic scan tool for PCM REPLACED , ECM
REPLACED , WCM REPLACED , or GATEWAY REPLACED under MISCELLANEOUS FUNCTIONS for the WIRELESS CONTROL
MODULE/WCM menu item as appropriate.
NOTE: Programming the PCM/ECM or SKREEM is done using a diagnostic scan tool and a PIN to enter secure access mode. If three attempts
are made to enter secure access mode using an incorrect PIN, secure access mode will be locked out for one hour. To exit this lockout mode,
turn the ignition to the RUN position for one hour then enter the correct PIN. Be certain that all accessories are turned OFF. Also monitor the
battery state and connect a battery charger if necessary.
NOTE: Before replacing the ECU for a failed driver, control circuit or ground circuit, be sure to check the related component/circuit integrity
for failures not detected due to a double fault in the circuit. Most ECM driver/control circuit failures are caused by internal component failures
(i.e. relay and solenoids) and shorted circuits (i.e. pull-ups, drivers and switched circuits). These failures are difficult to detect when a double
fault has occurred and only one DTC has set.
ECM/SKIM/WCM PROGRAMMING
When a ECM and the SKIM are replaced at the same time perform the following steps in order:
1. Program the new SKIM
2. Program the new ECM
3. Replace all ignition keys and program them to the new SKIM.
ECM/SKIM/WCM PROGRAMMING
When an ECM (Bosch) and the SKIM are replaced at the same time perform the following steps in order:
1. Program the new SKIM
2. Program the new ECM (Bosch)
3. Replace all ignition keys and program them to the new SKIM.
PROGRAMMING THE SKIM
CAUTION: Read all notes and cautions for programming procedures.
1. Connect a battery charger to the vehicle.
2. Connect the StarSCAN(R).
CAUTION: If the ECM/PCM and SKREEM/WCM are replaced at the same time, the ECM/PCM MUST be programmed before the
