CTRL Commercial Solutions: Trucking

CTRL's UL101 is a unique multi-purpose diagnostic tool for the automotive industry and aftermarket.

Through the detection of ultrasonic sound, the UL101 is used to inspect and check such items as: air brake systems, bearings, gear trains, cam and tappet assemblies, internal combustion engine valving and piston blow-by, gaseous piping and dueling, seals in refrigerated trailers and van bodies, air ducts, hydraulic systems and many other components.


Because ultrasonic waves attenuate faster than lower audible frequencies, it is much easier to pinpoint the source of the ultrasound. Moreover, there is usually much less noise interference. The UL101 receiver does not hear conversation and background noises. Extremely minute sounds can, therefore, be detected, analyzed, and the exact location determined.


Vacuum Leaks - Start from the intake manifold and work outward along the vacuum lines. If a leak is found, adjust the sensitivity of the UL101 down and move closer to the source. Once repairs are made, repeat the process to confirm repair and no new problems incurred.

Refrigerant Leak Detection - Charge the compressor with refrigerant or air. Start from the compressor and work outward along the air/gas lines, repeating the same steps as finding vacuum leaks.

Ignition Misfires - Set the sensitivity of the UL101 to the lowest level possible. Move the contact probe along the coil, ignition wires, or cop systems. Compare the firing sound of the cylinders. This is much easier when using the SoundCTRL Data Capture & Analysis System. A misfiring cylinder will have an irregular and loud popping sound.

Chassis Water Or Wind Noise - Place the UT2000 Ultrasound Transmitter inside the cab of the vehicle. Close all doors and windows. Use the UL101 Receiver to scan the exterior of the cab along gaskets and cracks. Any ultrasound escaping can be pinpointed and repairs made in a very quick time.


- Detect faulty injectors (gas and diesel).

- Find defective ignition coils & wires, spark plugs, relays, motors, and switches.

- Find poor electrical connections and shorts.

- Find small & large vacuum leaks.

- Find A/C refrigerant leaks, especially on evaporator systems.

- Detect worn bearings and bushings.

- Find tire leaks quickly without removing.

- Find leaks in cooling system head gaskets, water pumps, and injectors.

- Find partially blocked or bypassing valves in hydraulic systems.

- Detect arcing and spark plug separation.

- Find low pressure chassis wind & water leaks in body weather stripping, seals, and fuel tanks