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Thottle position sensors how it works (TPS) A throttle position sensor (TPS) is a sensor used to monitor the position of the throttle in an internal combustion engine ( More; info click here ) |
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Crankshaft sensor how does it work A Crankshaft Sensor also known as a Crank Angle sensor note’s the position of the camshaft and its relationship with the piston position inside the engine ( More; info click here ) |
Airflow meter How it works (AFM) Airflow meter This device measures the amount of air being drawn into the engine so that the fuel delivery can be calculated to mix with the air in the required quantities.so that the fuel delivery can be calculated to mix with the air in the required quantities. ( More; info click here ) |
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Mass Air flow meter ( MAS ) Mass air flow sensor This does a similar job as the air flow meter. ( More; info click here ) |
Manifold Absoulte pressure sensor (MAP) Manifold absolute pressure sensor This tells the brain how much load the engine is under by indicating the amount of vacuum in the inlet manifold. ( More; info click here ) |
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Knock Sensor The knock sensor is a unit that sits on the engine block and listens for "pinking", a metallic rattle caused by overly advanced ignition timing that can damage the pistons. When pinking occurs the sensor sends a voltage to the brain so the timing can be adjusted to prevent damage. ( More; info click here ) |
| Oxygen Sensor This sensor is fitted in the exhaust and measures the oxygen content of the burnt gases. If, for example, the oxygen levels are incorrect, the brain is instructed to vary the fuel supply until it reaches the desired level. This is usually referred to as the Lambda. Later vehicles have two sensors, one before the catalytic converter and one after, so gases can be monitored and the effectiveness of the converter can be measured ( More; info click here ) | |
| Temperature Sensors These sensors measure the engine coolant and intake air temperatures. Typically, if the engine is cold then the brain will know to open the injectors for a longer period to increase the fuel delivery, much like a choke on a carburetor. ( More; info click here ) | |
| Camshaft position sensor This sensor works like the crank sensor but gives a secondary reference point for the position of the canshaft and a signal for limp home mode if the crank sensor fails. ( More; info click here ) | |
| Limp home mode This term describes an average setting programmed into the brain, so the engine management system can work to get you home if one or more of the sensors fail. Normally you will find the engine will only rev to 2500 rpm when this happens. ( More; info click here ) |
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