In addition, in order to accurately determine the defect in the event of a malfunction of the electronic engine control, it is necessary to carry out a number of tests in a certain sequence. With an unskilled approach, damage to electronic components is not ruled out, and these damages entail costly repairs. The control device with the means available to the motorist cannot even be checked, let alone repaired. Practice shows that malfunctions of these nodes are very rare, however, sometimes malfunctions of sensors, switches or wires may occur, the causes of such malfunctions can be determined independently.
Before repairing or troubleshooting, it is necessary to interrogate the fault recorder, which is part of the engine control unit. This is done using the diagnostic system VAS 5051 (In workshop). Self-diagnosis makes it easier to find.
All vacuum hoses and connections must be checked for air leaks through leaks.
Fuel hoses in the engine compartment can only be secured with band clamps. The use of clamps with a bolt and nut, as well as hose clamps, is not allowed.
Disconnect and connect the battery only when the ignition is off, otherwise a malfunction of the control device may occur.
For the perfect functioning of electrical components, a voltage of at least 11.5 volts is required.
Do not use sealants containing silicone. Particles of silicone components in the engine do not burn out, as a result they damage the oxygen sensor.
During some checks, the control unit can recognize and register a fault, therefore, after the checks, it is recommended to interrogate and, if necessary, delete the data of the fault recorder.
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