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  Sensors - Security



Working on motor vehicles, even if only to check sensors, involves risks that must be minimized. A deterrent example is the test of a speedometer on a four-wheel drive. To do this, the vehicle must be jacked up and operated at the appropriate speeds.

If it is only raised, there is a risk that the drive shafts will reach positions that never occur in normal driving. So the wheel suspension itself must be supported without impeding the movement of the wheels. If only one axle is lifted, there is a risk of uncontrolled movements when starting the test and/or serious defects at the drive itself.

The vehicle must therefore be raised completely, whereby one can easily imagine possible further sources of danger. It is also possible that the extraction system is only designed for idle operation. So there are a lot of precautionary measures to be taken before such a test can be carried out stationary. Simply connecting the tester is far from enough.

Of course, there are also a number of things to consider when opening the bonnet. There can still be hot coolant that can spray against you, if you turn e.g. lids without motivation. But also touching parts carrying ignition voltage is sometimes punished with an electric shock. Quite apart from the fact that you are dealing directly with a high-voltage system.

What movement can do all by itself. A vehicle can move away from a jacked up position on its own. You can accidentally reach into rotating parts. The motor or e.g. the fan for the cooler starts automatically. Even poor communication with a helper can trigger something unexpected and lead to injury.

Tests are often the reason of uncontrolled actions. One person checks from below and another climbs with help of a ladder into the vehicle on the lifting platform, possibly also to start it. Impossible! Batteries are opened for charging and the exhalation is inhaled while checking the gassing. Cable fires are caused by short circuits, which in turn emit noxious gases.

And as practical as testing while driving is, you should pay particular attention to safety here. Two people are always needed in the car. If there is only one, the risk is very great that he or she pays more attention to the readings currently displayed than to the traffic. The routing of cables and adequate securing of the bonnet are also important, for example.

Errors can also occur when reading out measured values when the vehicle is stationary. The OBD connector is at risk when the clutch is pressed, or the parking brake is not applied. When idling, the extraction system of the exhaust gas is not taken into account. Without danger to humans, but associated with costs is an engine with a fault that prohibits it from running, e.g. lack of oil. So read out the error first.

Measuring is usually harmless to health, but not actuator diagnosis. Even mounting at a brake that is not deactivated poses a risk. But what if one person activates things that another is checking just now? Even starting while checking the fit of spark plug wires can be fatal. Perhaps even more dangerous is an automatic actuator test. You don't even know what's coming next.







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