P0340 Camshaft Position Sensor Circuit Malfunction

Camshaft Position Sensor 'A' Circuit Malfunction

P0340 Camshaft Position Sensor Circuit Malfunction
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OBD-II Diagnostic Powertrain (P) Trouble Code For Engine Intake Valve Control Solenoid Circuit Low Throttle/Pedal Position Sensor/Switch A Circuit Intermittent Injection lump Fuel Metering Control 'B' High (Cam/Rotor/Injector) Shift Solenoid E Performance or Stuck Off

P0340 Possible causes

  1. Faulty Camshaft Position Sensor
  2. Camshaft Position Sensor harness is open or shorted
  3. Camshaft Position Sensor circuit poor electrical connection
  4. Faulty starter motor
  5. Starting system circuit
  6. Dead (Weak) battery

P0340 Fault Symptoms :

  • Check engine light comes on
  • Engine stalling or misfiring
  • Engine performance issues
  • Car not starting

Possible Solutions With a P0340

OBD-II trouble code, diagnosis can be tricky at times. Here are some things to try:

  1. Visually inspect all the wiring and connectors in the circuit
  2. Check for continuity in the circuit wiring
  3. Check the operation (voltage) of the camshaft position sensor
  4. Replace the camshaft position sensor as required
  5. Check the crankshaft position circuit as well
  6. Replace circuit wiring and/or connectors as required
  7. Diagnose/replace the PCM as required

P0340 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. *Sensor design may vary for your model and year

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