Symptoms

- Engine Light ON (or Service Engine Soon Warning Light) - Lack/Loss of Power - Engine Stall

Possible Causes

- Camshaft Position Sensor harness is open or shorted - Camshaft Position Sensor circuit poor electrical connection - Faulty Camshaft Position Sensor - Faulty starter motor - Starting system circuit - Dead (Weak) battery

When Detected

The camshaft position sensor signal is not detected by the Engine Control Module(ECM) during the first few seconds of engine cranking

Tech Notes

Sometimes and in some models, low battery voltage or a weak starter can can trigger a Camshaft Position Sensor code.

Description

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 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.

Information For Specific Makes

P0340 ACURA P0340 BMW P0340 CHRYSLER P0340 JEEP P0340 DODGE P0340 FORD P0340 HONDA P0340 HYUNDAI P0340 NISSAN P0340 INFINITI P0340 ISUZU P0340 KIA P0340 SCION P0340 TOYOTA P0340 LEXUS P0340 MAZDA P0340 MITSUBISHI P0340 SUBARU P0340 AUDI P0340 VOLKSWAGEN