OBD Operation Summary for 6.7L Diesel - MotorCraftService.com

Most vehicle applications no longer have a standalone vehicle speed sensor input. The PCM sometimes obtainsvehicle speed information from another module on the vehicle, i.e. ABS module. In most cases, however, vehiclespeed is calculated in the PCM by using the transmission output shaft speed sensor signal and applying aconversion factor for axle ratio and tire programmed into the Vehicle ID block. A Vehicle Speed Output pin on thePCM provides the rest of the vehicle with the standard 8,000 pulses/mile signal.Note: If the Vehicle ID block has not been programmed or has been programmed with an out-of-range (uncertified)tire/axle ratio, a P1639 DTC will be stored and the MIL will be illuminated immediately.Output Shaft Speed Sensor Functional Check Operation:DTCsMonitor executionMonitor SequenceSensors OKMonitoring DurationP0720 – OSS circuitContinuousNoneTSS, Wheel Speed4.2 secondsTypical OSS functional check entry conditions:Auto Transmission Entry Conditions Minimum MaximumGear selector positionEngine torqueEngine rpm (above converter stall speed) ORTurbine shaft rpm (if available) ORVehicle speedForward range68 ft-lbs3000 rpm1033 rpm10 mphTypical OSS functional check malfunction thresholds:OSS < 200 rpmFORD MOTOR COMPANY REVISION DATE: FEBRUARY 9, 2012 09.01.00.02-PAGE 144 OF 157