Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMERCURY2004SABLE V6-3.0L DOHC VIN SREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSCAMSHAFT POSITION SENSORDESCRIPTION AND OPERATION
2004 Mercury Sable V6-3.0L DOHC VIN S
Camshaft Position Sensor: Description and Operation
2004 Mercury Sable V6-3.0L DOHC VIN SSECTION Description and Operation
CAMSHAFT POSITION SENSOR
The camshaft position (CMP) sensor detects the position of the camshaft. The CMP sensor identifies when piston No.1 is on its compression stroke. A signal is then sent to the powertrain control module (PCM) and used for synchronizing the sequential firing of the fuel injectors. The Coil On Plug (COP) ignition applications also use the CMP signal to select the proper ignition coil to fire. The input circuit to the PCM is referred to as the CMP input or circuit. DTC P0340 is associated with this sensor.
Vehicles with two CMP sensors are equipped with variable camshaft timing (VCT). They use the second sensor to identify the position of the camshaft on bank 2 as an input to the PCM. DTC P0345 is associated with this sensor and it is referred to as CMP2.
There are two types of CMP sensors: the three pin connector Hall-effect type sensor (Figure 28) found on F-Series 4.2L applications, and the two pin connector variable reluctance sensor found on all other vehicles (Figure 29).
Typical Hall-Effect Sensor:
Typical Variable Reluctance Sensor:
The camshaft position (CMP) sensor detects the position of the camshaft. The CMP sensor identifies when piston No.1 is on its compression stroke. A signal is then sent to the powertrain control module (PCM) and used for synchronizing the sequential firing of the fuel injectors. The Coil On Plug (COP) ignition applications also use the CMP signal to select the proper ignition coil to fire. The input circuit to the PCM is referred to as the CMP input or circuit. DTC P0340 is associated with this sensor.
Vehicles with two CMP sensors are equipped with variable camshaft timing (VCT). They use the second sensor to identify the position of the camshaft on bank 2 as an input to the PCM. DTC P0345 is associated with this sensor and it is referred to as CMP2.
There are two types of CMP sensors: the three pin connector Hall-effect type sensor (Figure 28) found on F-Series 4.2L applications, and the two pin connector variable reluctance sensor found on all other vehicles (Figure 29).
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.