STEYR MOTORS Marine Engine 2012 Series, Service Manual

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Electrical System
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06.07.02 Diagnostic system
The electronic engine management system controls the following parameters:
Oil pressure, boost pressure, coolant temperature, air charge temperature, exhaust
temperature.
The electronic engine management system has an automatic self-test program
checking all data of electronic sensors. As soon as a fault is found, there is an
optical or audible signal (refer to chart "Service Codes").
Occurred faults remain stored until cancellation. Stored faults may be selected,
analyzed and cancelled by means of PC via diagnostic connector or SCC.
An indicator for one or several stored service codes is the 5 second "Illumination" of
the "CHECK-ENGINE LAMP" and the "WARNING HORN" after ignition ON, instead
of usual 0,7 seconds. (refer to chart "Operating Status" according to marine
manufacturer)
On the CHECK-ENGINE lamp stored faults may be indicated by flashing codes.
(With a defined procedure, individual cancellation is possible.) Service Codes are
regarded both as flashing codes as will as display by diagnostic instrument.
There are three fault categories: temporary faults, non essential faults and essential
faults. According to these categories the engine management systems may pick
default values or select alternative parameters for fail save governing in order to
continue engine operation. If operating values are beyond the parameter limitation,
the system will memorize such happenings and store them permanently as misuse
code.
Illustration of key elements for Diesel engine governing
Main components : engine ECU and rack control solenoid with rack position sensor,
engine speed sensor, unit injector driven by camshaft via rocker arm.