C 2500 Truck 2WD V8-5.7L VIN R (1997)
Crankshaft Position Sensor: Description and Operation
Crankshaft Position (CKP) Sensor (4X)
4X Reference High Signal
The ignition control module receives signals from the 4X crankshaft position sensor. This signal is sent to the VCM as a 5V digital signal. The VCM
uses this input as part of it's final calculation for Ignition Control (IC) timing. Refer to Enhanced Ignition System for more information on the Electronic
Ignition (EI) system.
Crankshaft Position Sensor
The crankshaft position sensor provides a signal through the ignition control module which the VCM uses as reference to calculate RPM and crankshaft
position. Refer to Enhanced Ignition System. See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Component Tests
and General Diagnostics/Enhanced Ignition System Check
