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.
Camshaft Position Sensor
A 3-pin Hall Effect type Camshaft Position (CMP) sensor or a 2-pin variable reluctance sensor is used. See Fig 1 and Fig 2 . CMP sensor is used to determine camshaft position and to identify when piston No. 1 is on its compression stroke. CMP sensor signal is used by PCM for synchronizing the firing of sequential fuel injectors. Applications with Coil On Plug (COP) ignition also use CMP signal to select the proper ignition coil to fire. The input circuit to PCM is referred to as the CMP input or circuit.
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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.