Remove and clean the CKP (crankshaft position sensor)
High Voltage Switch Ignition System
Used on the 4.3L, 5.0L and 5.7L engines, the High Voltage Switch (HVS) ignition system consists of the PCM, distributor, ignition coil driver module, ignition coil and Camshaft Position (CMP) sensor. Ignition control and by-pass functions are controlled by the VCM.
Camshaft Position (CMP) Sensor
CMP sensor is similar to CKP sensor. CMP sensor provides one pulse (1X signal) per camshaft revolution. PCM uses this signal in conjunction with the crankshaft position to determine which cylinder(s) are misfiring.
Crankshaft Position (CKP) Sensor
CKP sensor is located in the front engine cover. Air gap between sensor and target wheel is preset and is not adjustable. Target wheel has 3 or 4 slots, depending on weather the engine has 6 or 8 cylinders and is keyed to the crankshaft. Rotation of target wheel creates a change in the magnetic field of the sensor which results in an induced voltage pulse. Based on these pulses, PCM is able to determine crankshaft position and engine speed. PCM will then activate the fuel injector and provide spark to distributor.
Distributor assembly contains the Camshaft Position (CMP) sensor, cap, rotor and shaft. A Diagnostic Trouble Code (DTC) will set when distributor is installed a tooth off in relation to the camshaft. Distributor is not serviceable.
Ignition Control Module
ICM receives ignition control signals from the PCM which in turn triggers the ignition coil. Since the PCM controls spark timing and ignition control during crank and run cycles, there is no by-pass mode. ICM is not serviceable.
Friday, March 13th, 2009 AT 6:02 PM