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.
DTC P0341: CMP Sensor Circuit Performance: Description
The Electronic Ignition (EI) module supplies a ground to the cylinder No. 4 wire whenever it determines cylinder No. 4 has just fired on its compression stroke. EI module uses capacitive pick-up plates located under 1/4 coil pack to determine polarity sequence and voltage amplitude of cylinder No. 1 and 4 secondary ignition. PCM supplies 5-volts on signal line and expects to see cylinder No. 4 signal wire go low after every 14 crankshaft pulses (2 revolutions). This is used to determine position of camshaft, except under decel. PCM only uses transition from 5 to zero volts as a valid TDC compression cylinder No. 4 signal. DTC sets when PCM detects extra cam pulses (greater than one cam pulse within 2 crankshaft revolutions).
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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.