OBD-II Trouble Code Description for P0340 Mazda

Camshaft Position Sensor “A” Circuit

What does this mean?

OBD2 Code P0340 Mazda definition:
This indicates that a problem was detected in the camshaft position sensor circuit. Since it says circuit, that means the problem could lie in any part of the circuit – the sensor itself, the wiring, or the PCM. Don’t just replace the CPS (camshaft position sensor) and think that will definitely fix it.

Symptoms

Possible sumptoms of OBD code P0340 Mazda
Symptoms can include: Hard starting or no start Rough running / misfiring Loss of engine power

Causes

Possible causes of OBD code P0340 Mazda
A code P0340 Mazda could mean one or more of the following has happened: a wire or connector in the circuit could be grounded/shorted/broken the camshaft position sensor may have failed the PCM may have failed there exists an open circuit the crankshaft position sensor may have failed

Possible Solutions

With a P0340 Mazda OBD-II trouble code, diagnosis can be tricky at times. Here are some things to try: Visually inspect all the wiring and connectors in the circuit Check for continuity in the circuit wiring Check the operation (voltage) of the camshaft position sensor Replace the camshaft position sensor as required Check the crankshaft position circuit as well Replace circuit wiring and/or connectors as required Diagnose/replace the PCM as required