DTC P0336: CKP Sensor Performance: Description

The Crankshaft Position (CKP) sensor produces an AC voltage of different amplitude and frequency depending on the velocity of the crankshaft. The CKP sensor works in conjunction with a 58 tooth reluctor wheel on the crankshaft. Each tooth is spaced six degrees apart with one span having a 12 degree space that is uncut. This uncut portion creates a pattern that enables the ECM to determine top dead center for cylinder No. 1 and its mating cylinder, cylinder No. 4. The Camshaft Position (CMP) sensor is then used to determine when cylinder No. 1 is on its compression stroke. With both CKP sensor and CMP sensor inputs, the ECM can properly synchronize ignition timing, fuel delivery and spark knock control. The ECM uses a pull-up voltage of 2.5 volts on each CKP sensor wire used for the reduction of noise interference from electromagnetic generating devices. DTC P0336 will set if the ECM loses the TDC cylinder No. 1 reference position after it has already synchronized engine position when the engine has been running or cranking. During this time the ECM is receiving a valid CMP sensor signal. This indicates that an erratic or intermittent A/C voltage from the CKP sensor is occurring.