Circuit Description

The crankshaft position (CKP) sensor signal indicates the crankshaft speed and position. The CKP sensor produces a DC voltage of varying amplitude and frequency. The frequency depends on the velocity of the crankshaft, and the DC output voltage depends on crankshaft position and battery voltage. The CKP sensor works in conjunction with a 58-tooth reluctor wheel attached to the crankshaft. The engine control module (ECM) determines the crankshaft position by the reference gap. The ECM can synchronize the ignition timing, fuel injector timing, and spark knock control based on the CKP sensor and the camshaft position (CMP) sensor inputs. The CKP sensor is also used to detect a misfire. The CKP sensor circuits connect directly to the ECM. The circuits between the CKP sensor and ECM consists of the following:

• A 12-volt reference
• A low reference
• A CKP sensor signal

If the ECM detects an incorrect number of CKP sensor signals, DTC P0336 sets.