In order to meet Federal Exhaust
Emission and Fuel Economy regulations, today's vehicles are
equipped with highly sophisticated electronic engine control
systems. These systems do not require periodic adjustments. The
only services required on a scheduled basis are spark plug and
filter replacement. Tune-ups, as we knew them, are no longer
necessary.
Engine Control Computer
The computer receives information from a network of sensors and
switches that convert engine operating conditions into electrical
signals. Based on the information and instructions stored in the
computer program, commands are then sent to three primary systems:
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Ignition System
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Fuel System
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Emission Control System
The sensors that monitor one or more of these systems include:
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1. Mass Airflow Sensor
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2. Throttle Position Sensor
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3. Manifold Absolute Pressure Sensor
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4. Coolant Temperature Sensor
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5. Exhaust Oxygen Sensor
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6. Crankshaft Position Sensor
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7. Camshaft Position Sensor
