C 1500 Truck 2WD V8-6.5L DSL Turbo VIN F (1998)
Voltage Signal: Description and Operation
High Resolution Signal (256X)
DESCRIPTION
The high resolution signal is an optical device which generates 64 equally spaced pulses per cylinder combustion stroke from the slotted disc mounted
on the injection pump timing cam ring. The pulses are counted by the PCM and used to measure the angular pump displacement. Fuel is metered by
using the angular indication and timing is measured by counting the angular pulses between the pump cam signal and the crankshaft position sensor
signal.
