this taken from DEC.
This option is used to match the PCM (Powertrain Control Module) to the PCU (Pump Control Unit). It is important that the key in the ignition is already programmed to this vehicle before using this option. If the key is not programmed, then module initialization will not be possible. If initialization fails, clear and reprogram all the PATS keys for this vehicle and rerun the module initialization option again. NOTE: For this procedure, the engine must be stopped and set ignition switch to ON. The minimum of programmed keys must be two
Peter
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