P0340

DTC P0340 Camshaft Position (CMP) Sensor Circuit

Circuit Description

The camshaft position (CMP) sensor is installed on the cylinder head at the rear of the camshaft gear. The CMP sensor detects total of five projections per one engine cycle (four projections arranged equally every 90° and one reference projection on the camshaft gear surface). The CMP sensor is a magnetic resistance element (MRE) type sensor which generates a square wave signal pulse. The sensor has the following circuits.

^ 5 volts reference circuit
^ Low reference circuit
^ CMP sensor signal circuit

The ECM monitors both crankshaft position (CKP) sensor and CMP sensor signal pulses to ensure they correlate with each other. If the ECM receives a certain amount of CKP sensor signal pulses without a CMP sensor signal pulse this DTC will set.

Condition for Running the DTC

^ DTCs P0642 and P0643 are not set.
^ The ignition switch is ON.
^ The CKP sensor signal pulse is detected.

Condition for Setting the DTC

^ The ECM detects that the CMP sensor signal pulses are not generated during engine 10 rotations.

Action Taken When the DTC Sets

^ The ECM illuminates the MIL when the diagnostic runs and fails. Refer to DTC Type Definitions for Action Taken When the DTC Sets - Type A.

Condition for Clearing the DTC

^ Refer to DTC Type Definitions for Condition for Clearing the MIL/DTC - Type A.

Diagnostic Aids

^ If an intermittent condition is suspected refer to Intermittent Conditions in this section.
^ Electromagnetic interference in the CMP sensor circuits may set this DTC.
^ An intermittent CMP sensor signal pulse may set this DTC.
^ Ensure the sensor is tight and the sensor rotor teeth are not damaged.

Notice: If the CMP sensor signal pulse is lost while running, the engine will operate normally. If the CMP sensor signal pulse is not present on start-up, the engine will not start.

Circuit/System Testing DTC P0340