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2-74 Service Manual
5021-0XX
996—Low voltage power supply (LVPS) service check
Step Questions / actions Yes No
1 Check cable for continuity
between engine controller
board connector LVCN and
HVPS ACN5 connector.
Check cable for continuity
between I/O board DCN21
and HVPS ACN5
connector. Also check for
shorted pins. Is cable
okay?
Go to step 2. Replace cable.
2 Replace LVPS. See “Low
voltage power supply
(LVPS) with cage
removal” on page 4-60.
Does problem persist?
Go to step 3. Problem solved.
3 Replace engine controller
board. See “Engine
controller board removal”
on page 4-55. Does
problem persist?
Replace I/O
board. See “I/O
board removal”
on page 4-70.
Problem solved.