P0340 FORD - Camshaft Position Sensor Circuit Bank 1 Sensor 1

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What does this mean?

Possible causes

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

Tech notes

There is a factory service bulletin for the following Ford models:
2005-2006 Ford Mustang
2004-2005 Ford F-150
2005-2006 Ford Expedition
2005-2006 Ford F-Super Duty
2006 Ford Explorer
2007 Ford Explorer Sport Trac
Ford Factory Service Bulletin OBDII Code P0340

1998 Ford Windstar Camshaft Position Sensor Replacement Procedure:



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

Possible symptoms

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

P0340 Ford 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

OBDII Code P0340 Ford - Camshaft Position Sensor Circuit Bank 1 Sensor 1 - Engine-Codes.com

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