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Discussion Starter #1 (Edited)
This system of special circuitry provides minimal engine operation should the powertrain control module (PCM), mainly the Central Processing Unit or EEPROM, stop functioning correctly. All modes of Self-Test are not functional at this time. Electronic hardware is in control of the system while in fail safe operation.

Examples:
Injectors-------------------Fixed
EVAP ---------------------OFF
Ign Timing-----------------Fixed
High spd fan--------------Energized
Low spd Fan -------------OFF
AC relay--------------------OFF
MIL---------------------------ON
Fuel Pump relay----------ON​
 
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