Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.
Nissan models with a distributor, the camshaft position sensor are part of the distributor.
There is a factory service bulletin for the following Nissan models:
2003 Nissan Altima
2004 Nissan Altima
2005 Nissan Altima
2004 Nissan Quest
2004 Nissan Maxima
Nissan Factory Service Bulletin OBDII Code P0340
Camshaft Positioning Sensor Replacement - Nissan Altima
The cost to diagnose the P0340 Nissan code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.
The camshaft position sensor signal is not detected by the Engine Control Module (ECM) during the first few seconds of engine cranking
The 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 causes 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 the timing of cylinder identification signals.
*Sensor design may vary for your model and year
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