ON-BOARD
DIAGNOSTICS
1
PC
INTERFACE
SOFTWARE
After
installing
the
PC
Interrace Diagnostics Software
on
your
laptop,
shut off
the
20
amp
DC
breaker
on
the
generators
control
box.
Attach
one
end of
the
Westerbeke
communication
cable to
one
of your laptops serial ports.
If
your
laptop does
not
have a serial port,
you
must
use
an
adapter
that
goes
from
a serial port
to
a
USB.
Attach the
other
end
of
the
communication cable to the
10
pin
connection
on
the
ECU.
Make sure that
the
red
wire
on
the
communications
cable
lines
up
with
the
pin
number 1
on
the
ECU.
Reference
the
label
on
the
ECU
to
identify pin
number
1.
Tum
on
the
20
amp
DC
breaker
as
soon
as
the
communication
cable
is
connected
to
both
the
ECU and
your
laptop.
Open
the
Interrace Software and under
communication
select
comm
port.
Select
the
comm
port that
the
cable
is
connected
to.
Under
communication
select start comm or crtl 'tS. The
word
communication
under the
menu
bar should
turn
from
RED
to
GREEN
if
the
communication link
is
properly
achieved.
If
it
does
not tum green, check
the
connections
at
the
PC
and
the
ECU.
Make sure that the connector
is
properly
positioined
on
the
ECU
and
that
all
the
pins
are
in
the
connector.
Verify
the
computer Comm Port selected
is
correct.
Make
sure
the
main
DC circuit breaker
is
turned
on.
The
ECll
interface
is
divided into four sections.
Engine
Conditions,
Wzdeband
02
Sensor
Control,
Engine
Control
States
and
Emissions
Records
Display.
ENGINE
CONDITIONS
This
section
monitors
the
running conditions of
the
engine.
Coolant
Temperature
Coolant
temperature
is
displayed
in
degrees C
and
degrees
F.
Air
Temperature
Air temperature
is
displayed
in
degrees C
and
degrees
F.
Engine
Oil
Pressure
.
Oil
pressure
is
displayed
in
BAR
and
PSI.
Battery
Voltage
Battery
voltage
at
the
ECU
is
displayed
in
V
de.
Engine
Hours
Engine
runtime
is
displayed
in
hours.
Engine
Speed
Engine
speed
is
displayed in
RPM.
60Hz operation= 1800 rpm
and
50Hz operation= 1500
rpm.
Lambda
ExhaustAir/Fuel
mixture.
You
should see readings going
abve
and
below
1.000
continuously
as
the ECU adjusts
the
Air/Fuel
mxture.
Throttle
Position
Indicates
the
position
of
the
throttle control unit
in
steps
relative
to
the
fully
closed
position.
Pulse
Width
In9icates the fuel injector pulse
width.
Manifold
Pressure
Indicates
the
pressure
in
the intake manifold
in
kPa.
WIDEBAND
02
SENSOR
CONTROL
This
section monitors the operating conditions of
the
wideband oxygen
sen'sor.
WB
02
Sensor
States
There are seven wide band sensor states.
1.
WB
Time Stamp
is
the initialization state for
the
wide
band lambda
sensor.
2.
WB
OL Delay occures during the post-crank enrichment
period. This
is
an
open loop fueling period.
This
.state
is
present until the WB02 heater comes
up
to
its
operation
temperature.
3.
WB
CL Start Comp is the beginning of closed-loop
fueling for the post-startup. The closed
loop
control
targets a rich lambda set point. The lambda set point
is
a
function of engine coolant and
this
set point
leans
out
as
a function of
time.
4.
WB
Warmup
is
enten:~d
only if
the
engine coolant
temperature
is
not above a certain threshold.
S.
WB
CL
No
Fault Checks occurs
when
the
lambda
closed
loop control is trying
to
control
the
fuel
delivery
to
Stoich (Lambda= 1.000) but
no
checks
for
emissions
faults
are
performed.
6.
WB
Closed Loop is closed loop lambda control
with
a
target set point
of
Stoich and emissions
faults
checks
occurs.
1.
WB
Open Loop state occurs if
an
emission
malfunction
is
detected. The closed loop lambda control
is
disabled.
WB
02
Heater
Status
There are three states for
the
Heater Status.
Low
Temperature, High Temperature,
and
Normal
Temperature.
The Normal Temperature
is
at 893m
V.
WB
02
Crossing
Stoich
There
are
three states for Crossing Stoich. Initialize
indicates
the initialization period for the
sensor.
Rich
indicates a
Lambda lower
than
1.000.
Lean indicates a Lambda higher
than
1.000.
Running
Closed
Loop
PI
Control
Indicator will
be
RED
when running
Open
Loop
and
will
tum
GREEN
when running closed
loop.
WB
02
Heater
Voltage
This
indicator reads the Wideband Heater status
in
milli-volts. The set point for this function
is
893mV.
Engines &
GefJerators
62
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