F 250 4WD Super Duty V10-6.8L VIN S (2001)
SOHC: Single Overhead Cam.
Solenoid: A device consisting of an electrical coil which produces a magnetic field in a plunger and pulled to a central position.
ST: Scan Tool. A device that interfaces with and communicates information on a data link.
Stoichiometry: An air/fuel mixture that is neither too rich nor too lean. Stoichiometric ratio is 14.7 parts of air for every 1 part of fuel.
Switch: A device for making, breaking, or changing the connections in an electrical circuit.
TA: Traction Assist.
TACH: Tachometer.
TB: Throttle Body. A device that controls airflow through the engine via a butterfly valve, and has an air bypass channel around the throttle plate.
TC: 1. Traction Control. Combines anti-lock braking and axle torque reduction to control wheel slippage. 2. Turbocharger.
TDC: Top Dead Center.
Tear Tag: The two-piece adhesive label attached to the PCM to identify its calibration.
Thermistor: A temperature dependent resistor, like that used in CHT and ECT sensors.
Timing: Relationship between spark plug firing and piston position expressed in crankshaft degrees before (BTDC) or after (ATDC) top dead center of
the compression stroke.
TMAP: Thermal Manifold Absolute Pressure Sensor. A MAP Sensor that includes a thermistor to measure intake air temperature.
TP: Throttle Position (sensor). A three-wire potentiometer that provides throttle angle and rate information for the PCM.
TP V: Throttle Position Sensor Voltage.
Transducer: A device that receives energy from one medium and transfers it to another. For example, thermal energy is converted to an electrical signal
through a temperature probe.
Transmissions/Transaxles:
NOTE: All related items are grouped under the general heading "TRANSMISSIONS" located at the end.
TSB: Technical Service Bulletin. Notifies service personnel of any known vehicle concerns, procedures, or general service information.
Underspeed Mode: A control mode that prevents the engine from stalling in the event it stumbles while running. Also used during engine crank.
Vacuum: Manifold pressure that is reduced below the ambient atmospheric pressure.
Variable Reluctance: A process of passing a varying magnetic field through wire windings and inducing a voltage.
VCT: Variable Camshaft Timing.
VECI: Vehicle Emission Control Information label.
VIN: Vehicle Identification Number. A unique identification number given to every vehicle produced. Includes information about the year, model,
engine, and plant origin of the vehicle.
VMV: Vapor Management Valve. Controls the flow of fuel vapors out of the carbon canister.
VOM: Volt-Ohm Meter. Readings are indicated by sweep hand on a printed scale rather than a digital (DVOM) display.
VPWR: Vehicle Power. A switched circuit that provides power to the EEC system. Compare "Battery Voltage
VREF: Reference Voltage. A dedicated circuit that provides approximately a 5.0 volt signal used as a reference by certain sensors.
WAC: Wide Open Throttle A/C Cut-off. Turns A/C system off during wide open throttle or certain other operating conditions.
