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1. Electronic Driveaway Protection System (EWS) is a means of preventing starting of the vehicle by an unauthorized key or other means. The EWS module reads the transponder chip from the key in the ignition and compares it to key data stored in the EWS module. If the key checks out the EWS will allow voltage to the starter relay. The engine control module then has the ability to operate the starter by grounding the control side of the starter relay. As with other systems, the EWS also requires the vehicle to be in park or neutral for automatic transmission cars or clutch depressed on manual transmission vehicles. On some vehicles the park/neutral switch position is sent to the EWS module from the transmission control module. Verify 12 volts coming from the transmission control module to the proper pin on the EWS when vehicle is in park or neutral.

2. During starter operation the EWS compares a rolling code table which is stored in memory to what should be the same rolling code table that is stored in the engine control module. If the tables match up, the engine control module will begin spark and injection operations. If the tables don't match, the engine will crank but not start.

3. If the EWS was replaced, the vehicle will need to be coded so the other control modules in the vehicle know that a new EWS has been installed.

4. After coding it may be necessary to perform the alignment procedure between the engine control module and the EWS module. The alignment procedure tells the control modules to start their rolling code tables at line 1. If both tables match up, the engine control module should then begin spark and injection operations.