1996 Ford F250 Owner's Manual - Page 176

Speed, Vehicle Speed and Transmission Temperature are used by the PCM to shift the transmission into a higher or lower gear when required for the best performance and fuel economy. For example, you may notice that the transmission will upshift to a higher gear more quickly when the vehicle is first driven and has not reached normal operating temperature. The PCM also controls the transmission's Torque Converter Clutch to further raise vehicle performance and fuel economy. The Torque Converter Clutch will engage when the transmission operating temperature and other conditions determined by the PCM have been met. Engagement of the clutch may be noted as a decrease in engine speed after an upshift has completed or when the driver has depressed the throttle while driving at a steady road speed. To help in troubleshooting, the PCM continually performs self-tests on the electronic control system and if any faults are detected, will store them in memory. The Transmission Control Indicator Light (TCIL), which is located on the gearshift lever, may flash steadily if a malfunction has been detected. If the TCIL is flashing, contact your Ford dealer as soon as possible. If this condition persists, damage to the transmission could occur. NOTE: The word "OFF" located on the end of the gearshift lever is the transmission control indicator light (TCIL). Putting Your Vehicle in Gear Your vehicle's gearshift is on the steering column. The Transmission Control Switch and indicator light are located on the end of the gearshift lever. You can put the gearshift in any of the several positions. 174