TROUBLESHOOTING 13
en-105
13 TROUBLESHOOTING
13.1 TROUBLE SHOOTING ______________________________________________________
Problem Possible Cause/Items to Check Additional Items to Check
Key switch ON - No power
to LDU
48VDC Battery or 48VDC Buffer Battery not
connected or discharged.
Check battery connections and voltage.
No 12V power to LDU. Overcurrent protec-
tion device in PDU may be tripped. Check
for open connection or shorted wire to GND
for LDU 48V power.
Cycle power once corrected.
Key switch ON - No power
to MCU or RCU
Main Contactor not on due to circuit breaker
tripped.
Check to see if circuit breaker 4 is tripped.
Fault Code on LDU Review any fault codes and take appropriate
action.
Overcurrent protection device in LDU
tripped. Check for open connection or
shorted wire to battery for main contactor
coil power.
Key switch START -
Engine won't crank
Note: Only 1 start sequence per Ignition on
is allowed. Must recycle keyswitch for
another start sequence.
12VDC Battery not connected or dis-
charged.
Check battery connections.
Operator not on seat Operator must be seated to start engine.
Check MCU LED's #2 and #3 to see if they
are on.
If not on check to see if circuit breaker 6 is
tripped.
Ensure a Genset program is selected.
Check MCU LED #18 on for Gas, or #17 on
for Diesel.
If neither are on check engine harness
connections.
Overcurrent protection device in LDU
tripped. Check for open connection or
shorted wire to battery for 12V contactor coil
power.
Check that three armrest connectors for
tight connection.
Overcurrent protection device in MCU
tripped. Check for open connection or
shorted wire to GND for Start relay coil
power.
No power to genset logic. Overcurrent pro-
tection device in PDU may be tripped.
Check for open connection or shorted wire
to GND for genset 12V power.
Cycle power once corrected.
No power to starter from start relay contact.
Overcurrent protection device in PDU may
be tripped. Check for open connection or
shorted wire to GND for Start relay output.
Cycle power once corrected.
No 12V power to MCU. Overcurrent protec-
tion device in PDU may be tripped. Check
for open connection or shorted wire to GND
for MCU 12V power.
Cycle power once corrected.
Fault Code on LDU Review any fault codes and take appropriate
action.
No CAN communication. Check that three armrest connectors for
tight connection. Check to make sure CAN
resistor terminator has tight connection
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