33
Diagnostic system
The electronic engine control unit monitors the following engine parameters:
oil pressure, boost pressure, coolant temperature, exhaust pipe temperature (Hi-riser), sensor control rack, potenti-
ometer accelerator, speed signal
The ECU carries out self-diagnostic and/or plausibility checks for all input values and sensor connections. In case of
irregularities, there is an optical or audible warning signal. (see page 77)
Existing active failures remain stored until the problem has been solved and the code has been cleared from the
memory.
To select stored service codes, a PC with diagnostic program (VR00134/0) or diagnostic tool (VR00135/1) is
necessary.
Malfunction during operation is ranked in three different categories intermittent failure, non essential failure and es-
sential failure.
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