Figure 9−3 Enscu Diagnostic Tree - 2 Long, 3 Short Led Code - Carrier VECTOR 6500 Operation & Service Manual

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diagnostic tree Figure 9−6
Check for high resistance
or an open on the FSA ground
circuit terminal 2.
Did you find and correct
the condition?
NO
With the FSA disconnected,
check the resistance of the
FSA coil. Spec is
2.8 ohms +/- 10%.
Is ohm reading within spec?
NO
Replace the FSA. Did
you find and correct
the condition?
NO
Remove new FSA
and re-install old
FSA back into
unit, FSA is not
the fault. Review
results of above
YES
tests with your
supervisor. If
necessary, go to the
beginning of the tree &
test again.
System
OK
Figure 9−3 ENSCU Diagnostic Tree - 2 Long, 3 Short LED Code
START HERE
Does the engine starter
NO
engage & turn the engine
over?
YES
Verify the proper voltage
going into FSA terminal
1. 12 VDC when
YES
Main Power switch is
first turned on for the
pull in voltage, 1 VDC for
hold in voltage & 0.8 VDC
during starter engagement.
YES
Do you have the correct
voltage?
System
YES
OK
YES
Remove the FSA from the
engine & inspect. FSA should
move freely without binding and
shaft should be straight. Is
FSA functioning properly?
NO
YES
Review results
of above tests
with your super
visor. If
necessary, go
to the
beginning of the
tree &
test again.
9−11
NO
Replace ENSCU. Did you find
and correct the condition?
NO
Remove new ENSCU
and re-install old
ENSCU back into unit,
ENSCU is not the fault.
Review results of above
tests with your
supervisor. If necessary,
go to the beginning of
the tree & test again.
Using jumper wire, are the
proper voltages present
at ENSCU terminal 7?
YES
NO
Check for open or high
resistance on circuit
between FSA and ENSCU.
Did you find and correct
the condition?
YES
NO
Review results
System
of above tests
OK
with your super
visor. If
necessary, go
to the
beginning of the
tree &
test again.
62-11389
.