4-18 Controller Troubleshooting
TP-5672 11/95
Engine Will Not Start
If the engine will not operate, check the power supply
board START LED and perform the following procedure.
For location of the START LED and other power supply
board components referred to in this section, see
Appendix B, Figure B-10.
1. If the START LED is off, jumper engine start
terminals 3 and 4 on the contactor assembly.
a. If the unit does not start when engine start
terminals 3 and 4 are jumpered, check the
generator set and the generator set wiring.
b. If the unit starts when the engine start terminals 3
and 4 are jumpered, remove the jumper between
engine start terminals 3 and 4. Jumper
TB-DC1-21 and TB-DC1-22.
(1) If the engine starts when TB-DC1-21 and
TB-DC1-22 are jumpered, replace the
power supply board.
(2) If the engine does not start when
TB-DC1-21 and TB-DC1-22 are jumpered,
check if there is a jumper between
TB-DC1-22 and TB-DC1-31. If there is not a
jumper, add one. If the engine still does not
start when TB-DC1-21 and TB-DC1-22 are
jumpered, replace the power supply board.
NOTE
When taking a voltage or resistance measurement
at a ribbon cable pin, do not disconnect the ribbon
cable from the board. Use a needle point probe to
take the readings from the holes on the top side of
the ribbon cable connector.
2. If the START LED is on, using a voltmeter, connect
the positive test lead to P4-1. Connect the negative
test lead to TB-DC1-34.
a. If the voltmeter reading is low (about 1 volt), the
status panel is defective. Replace the logic
board assembly.
b. If the voltmeter reading is high (about 10 volts),
replace the power supply board.