Specifications
ELECTRICAL
TROUBLESHOOTING
CHART
The
following test procedures will
require
the
use
of
a multimeter and the
engine's
wiring
diagram
(in
this
manual).
Also
refer
to
the
relay
testing
page.
WESTERBEKE
recommends
that
these
tests
be
performed by a
qualified
technician.
PROBLEM
TESTING
(12
VDC
is
battery
+
voltage
measured
to
ground)
----------------------------
Engine
cranks
but
fails
to
start
...
Test
for
B+
(12v)
at
terminals
30
and
86
on
the
K2
run
relay
If
OK
•
Test
for
B+
(12v)
at
run
relay
K2,
terminal
85
and
activate
the
start
switch.
Voltage
should
be
less
than
5
volts.
If
OK
•
Activate
the
start
switch,
test
for
B+(12v)
at
relay
K2
run
relay,
terminaI8?
INSPECTION/SOLUTION
Check
for
bad
connections
at
both
terminals.
Replace
the
K2
relay.
Inspect
the
connections
at
relay
K2,
terminal
85,
or
at
the
ECU
connector
J2,
pin
19.
Replace
the
K2
relay.
NOTE:
For
other possible
causes
(failure
to
start) such
as
fUel
pump,
speed sensor
(MPU),
ignition,
etc,
refer
to
the
these
sections
in
this
manual.
Engine
starts,
runs
but
shuts
down
.....
Test
for
voltage
across
the
oil
pressure
sensor
terminals,
with
the
engine
running
voltage
should
be
less
than
1.0
volts.
With
the
PC
interface,
read
the
.....
engine
shutdown
fault
IIOK.
Test
for
voltage
across
the
exhaust
temperature
switch,
when
the
engine
shuts
down,
it
should
read
zero
(0)
volts.
IIOK.
The
engine
temperature
sensor
maybe
faulty.
Low
DC
battery
charge
level
when
cranking
IIOK.
Speed
loss
IIOK.
Shorted
oil
pressure
sensor
IIOK.
External
fault
Engines & Generators
39
Faulty
oil
pressure
sensor.
Replace
sensor/switch.
Faulty
exhaust
temperature
switch.
Replace
switch.
Loss
of
coolant
thru
exhaust
elbow.
High
exhaust
temperature.
Test
sensor,
refer
to
component
testing
in
this
manual.
Change
batteryi
Replace
battery.
Check
MPU
and
wiring.
Replace
MPU.
Check
wiring/replace
sensor
Check
fire
suppression
system
for
cause