Circuit/System Description

The crankshaft position (CKP) sensor contains 2 hall-effect switches in one housing. This sensor configuration produces 2 separate CKP sensor pulses. These pulses occur when 2 interrupter rings, mounted to the crankshaft balancer, the outer one containing 18 evenly spaced windows and blades, the inner one containing 3 unevenly spaced windows and blades, pass by the sensors. The 18X sensor produces 18 pulses per engine revolution. The 3X sync sensor produces 3 pulses per engine revolution, each pulse representing a pair of companion cylinders. Both sensors are connected directly to the ignition control (IC) module. The sensor wiring includes the following circuits:

• The CKP sensor 1 signal circuit
• The CKP sensor 2 signal circuit
• A shared 12-volt reference circuit
• A shared low reference circuit
• A low resolution engine speed signal circuit

The IC Module uses the sensors to determine the engine position and speed. A signal converter within the IC module, using the 18X CKP sensor 1, produces a digital 18X output signal to the powertrain control module (PCM) on the medium resolution engine speed signal circuit. The PCM monitors the low resolution engine speed signal circuit for errors.