This service function can be used to read out the measurement values blocks from the DDE control unit. The table below briefly describes the measurement values and provides notes on their interpretation.
Note: To continue the targeted diagnosis of certain components, the test modules for the corresponding functions and component groups must be used.
Measured value |
Description |
Remarks |
Unit |
|---|---|---|---|
Engine speed |
Engine speed |
|
rpm |
Accelerator pedal module |
Position of the accelerator pedal module, potentiometer 1 |
|
% |
Coolant temperature |
Coolant temperature |
|
°C |
Vehicle voltage |
Voltage supply at the DDE control unit |
|
V |
Status synchronization |
Status of synchronization of camshaft and crankshaft sensors |
relevant for engine start-up |
- |
Ambient pressure |
Ambient pressure |
|
mbar |
Alternator load signal |
Load on the alternator |
|
% |
Kilometre reading |
Kilometre reading |
|
km |
Injection volume |
Injection rate calculated by DDE control unit |
|
mg/stroke |
Air mass, actual |
Air mass measured by HFM |
|
mg/stroke |
Air mass, nominal |
nominal value of air mass calculated by DDE control unit for EGR control |
only relevant with active EGR control! See functional description for EGR control |
mg/stroke |
Activation of EGR valve |
Pulse duty factor the DDE control unit uses to activate the EGR valve |
|
% |
Charge-air pressure, actual |
Charge-air pressure measured by charge-air-pressure sensor |
|
mbar |
Charge-air pressure, nominal |
nominal charge-air pressure calculated by DDE control unit for charge-air-pressure control |
only relevant with active charge-air-pressure control! See functional description 'Turbo pressure adjuster' |
mbar |
Rail pressure, actual |
Rail pressure measured by rail-pressure sensor |
|
bar (kPa/psi) |
Rail pressure, nominal |
nominal rail pressure calculated by DDE control unit for rail pressure control |
only relevant in the case of active rail pressure control, i.e. only with the engine running! |
bar (kPa/psi) |
Activation of pressure control valve |
Pulse duty factor the DDE control unit uses to activate the pressure control valve |
|
% |
Activation of flow regulating valve |
Pulse duty factor the DDE control unit uses to activate the flow regulating valve |
|
% |