Hella Gutmann mega macs 50 User Manual page 33

Diagnosis > Parameters <
Since the causes of faults can be interpreted differently by the control unit, it is often not sufficient to read out only
the fault memory.
In many cases, either fault codes are not entered or it is not possible to obtain an unequivocal statement about the
defective component from the fault text.
Example 1:
The engine temperature may vary within a range of -30°C to +120°C.
If the sensor signals +9.0°C, although the actual temperature in the engine is +80°C, the control unit will determine
an incorrect injection time.
No fault code will be set, as this temperature is logical for the control unit.
Example 2
Fault text: Lambda probe signal faulty
In both cases, a diagnosis can only be carried out if the corresponding parameters are read out.
mega mac 50 reads the parameters out and presents them in plain text.
If up to 4 parameters are selected, they will also be displayed in graphic form.
A maximum of 8 parameters can be called up, but in this case they will not be presented in graphic form.
A task-orientated selection of the parameters facilitates fault diagnosis.
Information on the parameters is stored.
Procedure
1. Connect mega macs 50 to establish communication as described in section E.
> Parameters > Engine
Speed
1/min
870
Fuel pressure
bar
280
Injection volume
mm_/H
11.7
Accelerator position
%
35
F1 Info F3 Channel
33 mega macs 50 Section G 1/3