Westerbeke 6.5 MCG Service Manual page 61

SOFTWARE DIAGNOSTICS
ENGINE SHUTDOWNS RUN STATE:
Engine RUN state is • DC circuit breaker on, generator started
and running.
In the RUN state,
all
shutdowns are logged and a light will be illuminated on the control panel. The generator will be shutdown
and the light(s) will stay illuminated until the 12 VDC power to the generator is cycled.
Oil Pressure
shutdowns illuminate the OIL PRESSURE light.
Engine Coolant Temperature
shutdowns illuminate the ENGINE TEMPERATURE light.
Exhaust Temperature High shutdown illuminates the EXHAUST TEMPERATURE light.
External Alarm
shutdown illuminates the EXTERNAL ALARM light.
Overspeed
and
Underspeed
shutdowns illuminate the pair of SPEED lights.
All other shutdowns illuminate the pair of CHECK ENGINE lights.
I
WARNING/DESCRIPTION
PROBLEM
PROBABLE CAUSE
CoolantTemperiture Shorted
Short circuit (0 Ohms) 1. Faulty tempemture sensor.
2. Pinched
or
bare wire in harness.
Coolant
Temperature Open Open circuit 1. Faulty ECT sensor.
2.
loose
connection or corroded wirlno.
Coolant Temper.rture
High
Reading more than 1WC (212"
F)
1. Faulty tempemture sensor.
2. Coolant or raw water problen\llevef..flmv isstle.
3. Engine heat soak after normal shutdown.
Ullderspeed
1.
Excessive
load
~generator.
1500rpm 1350 rpm for 4 seconds
2. Inspect
stepper wiring.
1800rpf!l 1620 rpm for 4 seconds 3. Fuel supply insutr~.
Overspced
0\'lr
1950 rpm for 0.5 seconds 1.
Vacuum
Ita: in-intake manifold or
fiOset. ·
1500rpm Over.1800
rpm
for 1.0 seconds
2. Throttle
shaft
stlcki~.
0\'!1' 1725 rpm for 2.0 seconds
3. Inspect stepper Wiring.
..
O\'lir1650 rpm for 4.0 secondS
Ovorspeed
Over 2340
rpm
for 0.5 second$
..
1. Vacuum
leak
in
Intake
manifold or hoses.
1800rpm Over 2160 rpm for 1.0 second$
z.
Thi'Ottle shift sticking.
Over 2070 rpm for 2.0 seconds 3. Inspect stepper wiring.
Over 1980 rpm
for
4.0 seconds
'"
Crank Sensor Possible Fault lnt:emal ECU parameter
1. loose connection
Or
corroded
wiring.
$Jl~ signal intermittent
2. Sensor needs adjustme.nt.
3. Senso.' tip
contamiiiated
with
metal filings.
4. Crank speed
sensodal.iltY:
s.
Speed
concfltioning
modult
faUlty.
Grant Signal loss No
speei1
signal to ECU for 3+ seconds.
1. loose
connection
or
corroded
wifino.
2.
Sall$0r tip
wntaminate<J with metal
fllinos.
3.
Crank
sPeed~
faulty.
4. Sell$0r needs adiUSbYient
Throtlfe
toss
of Home Internal ECU parameter. 1. Throttle shaft stidcing.
2. Weak battel)'.
3. IRSJ)ett stepper Wiring.
Oil
Pressure Sender Shorted Short
circuit (0 ohms)
1. Faulty Oil pl'e$$tlre sender.
2. Pinched or shorted wire in harness.
Oil Pressure Sender Open Open
circuit (ro ohms) 1. Faulty oil pressure sender.
2. Loose connet1ion or corroded
wiring.
Oil PI'I!Ssure Low
Reading less than 8
psi
for 5 seconds.
1.
Checll
oillellel.
2. Insure pi'OJ)er oil Yiseosity.
3. Clmk lubrication system for leaks,
59