K 3500 Truck 4WD V8-6.5L DSL Turbo VIN S (1999)
Diesel Fuel Temperature / Fuel Pump Position Combination Sensor: Description and Operation
Optical/Fuel Temperature Sensor
The optical sensor has a 5V reference that powers the optics. The PCM supplies 5V. to the optical sensor through the high res signal circuit and pump
cam signal circuit. The optical sensor then generates a high resolution signal and a pump cam signal and sends these signals back to the PCM.
