Circuit Description

The crankshaft position (CKP) sensor B is a 7X variable reluctance sensor. This produces 7 digital ON/OFF pulses per engine revolution. These pulses occur when a reluctor wheel, mounted to the crankshaft and containing 6 slots evenly spaced 60 degrees apart and 1 slot spaced at 10 degrees, passes by the sensor. The 7X sensor is connected directly to the ignition control module (ICM). The sensor wiring includes 2 circuits, a CKP sensor signal circuit and a low reference circuit. The ICM uses the 7X signal to determine the engine position and speed. A signal converter within the ICM produces a digital 3X output pulse to the powertrain control module (PCM) on the low resolution engine speed signal circuit. The PCM monitors the low resolution engine speed signal circuit for errors. If the PCM receives no signal from the ICM, DTC P0385 sets.