Engine Diagnostics
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|
| |
Engine Control
Computer |
 |
Mass
Airflow Sensor |
 |
Throttle Position
Sensor |
 |
Manifold Absolute Pressure
Sensor |
 |
Coolant Temperature
Sensor |
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Exhaust Oxygen
Sensor |
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Crankshaft Position
Sensor |
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Camshaft Position
Sensor |
|
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| 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: |
|
