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:
- Ignition System
- Fuel System
- Emission Control System
The sensors that monitor one or more of these systems include
- Mass Airflow Sensor
- Throttle Position Sensor
- Manifold Absolute Pressure Sensor
- Coolant Temperature Sensor
- Exhaust Oxygen Sensor
- Crankshaft Position Sensor
- Camshaft Position Sensor
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 Engine Diagram
- Mass Airflow Sensor
- Throttle Position Sensor
- Manifold Absolute Pressure Sensor
- Coolant Temperature Sensor
- Exhaust Oxygen Sensor
- Crankshaft Position Sensor
- Camshaft Position Sensor
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