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Trophy Dash

A short match, at the start of the event, among the fastest qualifying cars in an oval track race.

Trophy Run

A match for an individual class trophy in drag racing.

Trouble Code

A number generated by a computer to indicate a failure in a sensor, circuit, or the computer itself. The number may be communicated to the technician by the flashing of a dash light when the diagnostic mode is entered. Also known as failure code.

Trouble Diagnosis

The work required to find the cause of a problem.

Troubleshooting

The location of a problem or malfunction by a process of elimination.

TRR

Transmission range reverse.

TRS

An acronym for transmission-regulated spark system.

Truck

A large vehicle generally used for hauling cargo or for pulling a trailer.

Truck Tractor

A large truck with a fifth wheel used to pull a semitrailer.

Truck-Frame And Axle Repair Association (TARA)

A trade association of those engaged in repair of truck and heavy equipment frames.

Truing

1. Straightening bent shafting or parts. 2. Dressing a grinding wheel. 3. Setting up a flywheel or pulley so that it runs evenly without sideways motion at its rim. 4. Making an edge straight or bringing two parts square with each other.

Trunk

A storage compartment at the rear of most passenger cars.

Trunk Unit

An early automotive air-conditioning evaporator that mounted in the trunk compartment and was channeled through the package tray.

Trunnion

The ends of a universal joint cross where the bearings ride.

Truth Table

A chart used to show the output condition of a logic gate or circuit as compared to different conditions of input.

TSB

An acronym for technical service bulletin. The periodic information provided by the vehicle manufacturers regarding any problems encountered.

TSD

An acronym for time, speed, and distance.

TSL

Transmission select switch low.

TSN

Transmission select switch neutral.

TSOD

Transmission select switch over-drive.