Deutz EMS2, Описание системы

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Page 73
EMS 2
Diagnosis
7 Diagnosis
7.1 Self-diagnosis
Self-diagnosis becomes active when a minimum supply voltage (> 9 V) is exceeded.
In this case, both internal control unit faults are determined and the inputs and outputs and the sensors and
output loads are checked for cable break and short-circuit. The fault must be present for a minimum period
of time before it is stored. Continuous diagnostic lamp illumination indicates that a fault is currently present.
A maximum of 15 faults are stored simultaneously. The individual faults which this involves can be seen
from the fault message Table.
The fault messages are displayed as flashing codes as described in Section 7.2, and via the interfaces to
PCs and diagnostic units as described in Chapter 8.2.
7.2 Diagnosis with flashing codes
The diagnostic lamp informs the operator of the presence of a fault or exceeded limit values, as described
in the case of the engine protection functions in Chapter 4.2, with continuous illumination.
When the engine is stationary, each depression of the diagnostic/override button leads to the output of a
flashing code which indicates which fault or signal has exceeded the limit value.
Each time the button is pressed, the next fault is displayed. Following the last fault, the first fault message is
output again.
The flashing code is comprised of long and short flashing pulses which the operator counts.
The appropriate fault can be seen in the fault message Table (Chapter 8.4).
7.3 Diagnosis with SERDIA software
Together with the interface and notebook (or PC), SERDIA (Service Diagnosis software) forms a combined
special service tool. With the aid of the SERDIA diagnostic software, information regarding the following
can be displayed:
- Fault memory
- Configuration (authorisation is determined via the interface level)
- Measurement values
- Maintenance data
- Load population.
Fault messages for passive or eradicated faults can be deleted with SERDIA.
SERDIA (Service Diagnosis) is a software programme which the operator can use, via the PC, to monitor
measurement values and detect faulty operating behaviour whilst the diesel engine is running.
In order to achieve this, the PC is connected to the diagnostic interface via an interface. Communication
with the control unit is carried out via a special EMS 2 protocol.
With regard to handling SERDIA, see separate manual. The acquisition of SERDIA is explained via a DEUTZ
service memorandum.