P0340 CHEVROLET - Camshaft Position Sensor 'A' Circuit Malfunction
Tech notesOn some Chevrolet models the camshaft position sensor is part Ignition Control Module (ICM) (aka igniter)
Trailblazer P0340 - Cam sensor test and replace
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When is the code detected?The camshaft position sensor signal is not detected by the Engine Control Module(ECM) during the first few seconds of engine cranking
P0340 Chevrolet DescriptionThe Camshaft Position Sensor is an electronic device used in an engine to record the rate at which the camshaft is spinning. This information is used by the Engine Control Module(ECM) to control ignition and fuel injection. The camshaft position sensor senses the retraction of camshaft (intake) to identify a particular cylinder. The camshaft position sensor senses the piston position. The sensor system consists of a rotating part, typically a disc, as well as a static part, the actual sensor.
When the engine is running, the high and low parts of the teeth cause the gap with the sensor to change. The changing gap causes the magnetic field near the sensor to change. The change in the magnetic field cause the voltage from the sensor to change.
When the crankshaft position sensor (POS) system becomes inoperative, the camshaft position sensor provides various controls of engine parts instead, utilizing timing of cylinder identification signals.