Injection Pump Cam Signal (4X)
DESCRIPTIONThe 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.