Westerbeke 20.0KW sbeg Operator's Manual page 52

PROBLEM
ELECTRICAL TROUBLESHOOTING CHART
The following test procedures will require the use of a multimeter and the
engine~
wiring diagram (in this manual). Also refer to the relay testing
page. WESTERBEKE recommends that these tests be peiformed by a
qualified technician.
TESTING INSPECTION/SOLUTION
(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
Check for bad connections at both terminals.
Replace the K2 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, terminal 87.
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
II OK •
Test for voltage across the exhaust temperature
switch, when the engine shuts down, it should
read lero (0) volts.
IIOK.
The engine temperature sensor maybe faulty.
Low DC battery charge level when cranking
If OK •
Speed loss
IIOK.
Shorted oil pressure sensor
IIOK.
External fault
...v'
WESTERBEKE
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 battery/ Replace battery.
Check MPU and wiring. Replace MPU.
Check wiring/replace sensor
Check fire suppression system for cause