9
−
10
62-11389
YES
NO
YES
YES
NO
YES
NO
NO
YES
NO
YES
NO
.
YES
YES
NO
Using jumper wire,
verify there is at least 11
VDC at ENSCU terminal 25?
System
OK
System
OK
System
OK
System
OK
START HERE
Verify unit starts, go into
high speed and stall after
running for a few seconds?
Verify there is at least 11
VDC going into the
ENSSN 12 V terminal?
Check for high
resistance or an
open in the
ENSSN ground
circuit.
Did you find and
correct the condition?
Check for high
resistance or an
open between
ENSCU terminal
25 & ENSSN
12 V terminal.
Did you find
and correct
the condition?
Using jumper wire, check for
5 VDC at ENSCU terminal
10. Do you have 5 VDC at
terminal 10?
Replace ENSCU.
Did you find and correct
the condition?
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.
Check for open or high
resistance on circuit
between ENSSN and ENSCU.
Did you find and correct the
condition?
Remove new ENSSN
and re-install old
ENSSN back into unit,
ENSSN is not the fault.
Review results of
above tests with your
supervisor. If
necessary, go to the
beginning of the tree
& test again.
Replace ENSSN. Did you
find and correct the
condition?
Figure 9
−
2 ENSCU Diagnostic Tree - 2 Long, 1 Short LED Code
