C 1500 Truck 2WD V8-6.5L DSL Turbo VIN F (1998)
Voltage Signal: Description and Operation
Injection Pump Cam Signal (4X)
DESCRIPTION
The Injection Pump Cam signal is an optical device which generates one pulse per cylinder combustion stroke from a slotted disc mounted on the
injection pump timing cam ring. The pulse is used to located the start of injection event for each cylinder (i.e. timing) with the respect to the crankshaft
position sensor. The number one cylinder is identified with a wider pulse (larger slot in disc). The PCM uses this information in order to adjust the idle
fuel, the timing and the trigger real time events. The Injection Pump Cam Signal is used in the diagnostics of the crankshaft position sensor and the
high resolution circuit.
