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• Engine Controls
  1. Mass Airflow Sensor
  2. Throttle Position Sensor
  3. Manifold Absolute Pressure Sensor
  4. Coolant Temperature Sensor
  5. Exhaust Oxygen Sensor
  6. Crankshaft Position Sensor
  7. Camshaft Position Sensor
  
  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
   

In today's modern systems cars have a "check engine" or "service eng soon" or "power loss" light that will come on in the event the engine controller detects a sensor out of its specified ranges, and store a "trouble code." Today's technician must then interface the computer with a "scan tool", read diagnostic codes, verify and trace the problem to:

• Connections and corrosion
• Faulty sensors
• Faulty or tampered with wiring
• Module or controller problems
• Component or part failures

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Last modified: 02/26/09