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- Faulty Crankshaft Position (CKP) Sensor - Crankshaft Position (CKP) Sensor harness is open or shorted - Crankshaft Position (CKP) Sensor circuit poor electrical connection - Faulty Ignition Control ModuleThe 3X reference signal is produced by the Ignition Control Module. The ICM calculates the 3X reference signal by dividing the Crankshaft Position sensor 18X pulses by 3. This calculation is performed while the engine is running, and while the CKP sync pulses are being received. The Powertrain Control Module uses the following information: - The 3X reference signal in order to calculate the engine RPM, and the CKP at engine speeds above 1,200 RPM - The pulses on the circuit in order to initiate injector pulses - A constant monitoring of the number of pulses on the 3X reference circuit - A comparison to the number of 3X reference pulses to the number of 18 X reference pulses and CAM signal pulses being received....so yes. the crank sensor could absolutely be at fault
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