Functional Description of EGM
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Status September 2003 (EvoBus-Service / AFT) Page: 23 of 83
2.2.1.9 Engine protection: ignition
From the software version 13A, the EGM engine control unit is capable of detecting breaks in wiring on
the primary side and interturn faults on the actuation cables of the ignition modules. In the case of a
fault, the corresponding fault codes are stored in the fault memory and corresponding emergency running
measures are initiated. The EGM engine control unit is capable of compensating the failure of up to three
cylinders; if an additional cylinder fails, the engine is switched off.
Engine protection: ignition
Title: Diagnosis of gas injeciton (Cyl. 1-6),
Ub short-circuit, short-circuit to earth, break in wiring
File: kd_hwd_zuendung_Fehlerdarstellung.vsd
Date of last change: 2001-08-22
Actuation of engine control
4 3
Ignition module
5
Kl.
GND
+ -
Batter
Short-circuit to earth
Break in
wiring
+ -
Batter
Ub short-circuit
As in the case of defective actuation of the ignition modules, a failure of the ignition on the corresponding
cylinder should be assumed, the engine availability is greatly reduced if a fault occurs.
If a fault occurs:
- the torque specification of the driver is ignored (limited to zero),
- an increased engine idling speed of approx. 900 rpm is set and
- the lambda control is switched off.
Note:
• Faults in the secondary side of the ignition system can NOT currently be directly detected by the
EGM engine control unit!!
• An indirect detection is possible from software version 14A with the exhaust-gas temperature sensor
following the catalyst. The conditions is that the catalyst has reached the operating temperature.
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