Circuit Description

The camshaft position (CMP) sensor is a 1X sensor. The CMP provides one digital ON/OFF signal to the powertrain control module (PCM) per revolution of the camshaft. This information is used by the PCM to determine the position of the valve train relative to the crankshaft position (CKP). By monitoring the CMP and CKP signals, the PCM can accurately time the operation of the fuel injectors. The CMP sensor is connected directly to the ignition control module (ICM). The sensor wiring includes the following circuits which are shared with the CKP sensor:

• The CMP sensor signal circuit
• A 12-volt reference circuit
• A low reference circuit

The signal is passed through the ICM to the PCM on the camshaft position signal circuit. The PCM monitors the CMP sensor for errors. If the PCM does not receive a signal from the CMP sensor, DTC P0340 sets.