The system monitors fuel delivery and catalytic Converters. To monitor these systems the PCM uses oxygen sensors, crankshaft and camshaft position sensors, a MAP sensor, manifold temperature sensor, knock sensor, throttle position sensor, engine coolant sensor, engine oil pressure sensor and an engine speed sensor. The PCM also includes a starter control. This control will ensure that; 1, if the key is prematurely released the starter motor will continue to crank until the engine starts, 2, if the key is held for an excessive period the PCM will disengage the starter preventing overheating and damage to the starter, and 3, if the key is switched to crank while the motor is running the PCM will not allow the starter motor to crank.

All input information is analyzed by the PCM to determine if engine emission levels and current operating status of the engine are within the operating levels that are required to meet today's increasingly stringent emission requirements. The PCM is also capable for storing and retrieving diagnostic codes to help technicians diagnose and fix problems faster and with more accuracy.

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