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Home >> Chevy Truck >> 1999 >> Express 1 Ton Van V8-6.5L DSL Turbo VIN F >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Scan Tool Testing and Procedures >> Scan Tool Data, Normal Values and Definitions >> Scan Tool Data Definitions - Powertrain Systems >> Engine Speed

Engine Speed

Range 0-9999 RPM
Engine speed is computed by the PCM from the crankshaft position sensor. If the crankshaft position sensor is inoperative, an rpm reading is taken from the injection pump cam signal. It should remain close to desired idle under various engine loads with engine idling. Engine speed value is very accurate.
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