STEYR MO256H45 User Manual

32
Electronic Engine Control Unit (ECU)
The STEYR MOTORS Marine engine is equipped with an Electronic Engine Control Unit (ECU) that performs the
following:
* controls engine functions to ensure maximum efficiency.
* self-diagnostic to protect the engine from damage if operating parameter are exceeded.
* stores diagnostic data of ECU server circuits for maintenance and service.
* stores abuse data
Engine power is reduced if:
Operating
Parameter
Effect
noticed
Panel
Indication
Additional
Tool-Readings
Action or
possible reason
High engine coolant
temperature limit
exceeded
Reduction of
engine speed
Horn ON 2x p. sec.
Gauge reading
>107 °C
Steyr Diag
Power limitation
See table trouble
shooting:
Cooling system
Defect – engine
coolant sensor or
sensor connection
Reduction of
engine speed
Horn ON 2x p. sec.
Gauge reading
>120 °C
Steyr Diag
Service code
Sensor or connector
failure; see service
code table
Exhaust temperature
limit exceeded
Reduction of
engine speed
Horn and indication
light “CEL” ON
2x p. sec.
Steyr Diag
Power limitation
See table trouble
shooting:
Raw water cooling
system
Defect – Exhaust
temperature sensor
or sensor connection
Reduction of
engine speed
Horn and indication
light “CEL” ON
2x p. sec
Steyr Diag
Service code
Sensor or connector
failure; see service
code table
Oil pressure below
limit
Reduction of
engine speed
Horn continuous and
Oil indication light
continous switched
ON
Steyr Diag
Power limitation
See table trouble
shooting:
Engine oil system
Defect – Oil pressure
sensor or sensor
connection
Reduction of
engine speed
Oil pressure
indication light
switched ON
1x p. sec.
Steyr Diag
Service code
Sensor or connector
failure; see service
code table
Insufficient boost
pressure or defective
sensor
Reduction of
engine speed
Steyr Diag
Power limitation
See table trouble
shooting:
Air charge system
Engine speed sensor
fault
Higher or unstable
idle speed, limited
performance
No RPM indication
on tachometer
Steyr Diag
Service code
See table trouble
shooting:
Speed sensor
Engine speed
remains at idle
No increase of
engine speed if
throttle is moved to
max.
Steyr Diag
Service code
See table trouble
shooting:
Accelerator
potentiometer failure
Governor position
system
Irregular engine
speed or stalled
engine
Steyr Diag
Service code
See table trouble
shooting:
Governing system

STEYR MO256H45 Specifications

General

Brand	STEYR
Model	MO256H45
Category	Engine
Language	English