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TM 9-2320-364-20-3
2-2932
6. FAN SPEED DOES NOT LOWER FROM HIGH SPEED TO LOW SPEED (CONT).
Heater blower motor operates,
indicating CB15 OK.
Fan operates at low speed with
hydraulic selector switch
in AUTO or CRANE/SRW
position.
Fan speed does not lower with
throttle position switch
depressed.
Wire 1956 is OK.
Throttle postion switch OK.
Wire 1957 OK.
Turbo boost pressure switch
faulty.
Wire 1955 faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Voltage test.
STE/ICE-R #89.
If turbo boost pressure switch
is faulty, 22 to 28 vdc will not
be present on wire 1955.
YES
NO
Replace turbo boost
pressure switch
(Para 7-61).
Verify repair, go to
Step 19 of this Fault
17.
Are 22 to 28 vdc measured on
wire 1955 at the turbo boost
pressure switch?
Repair wire 1955
(see schematic
Fig 2-67) or notify DS
Maintenance.
Verify repair, go to
Step 19 of this Fault.
16.
Are 22 to 28 vdc measured on
wire 1957 at the turbo boost
pressure switch?
YES
NO
Heater blower motor operates,
indicating CB15 OK.
Fan operates at low speed
with hydraulic selector switch
in AUTO or CRANE/SRW
position.
Fan speed does not lower with
throttle position switch
depressed.
Wire 1956 is OK.
Throttle position switch OK.
Wire 1957 faulty.
Turbo boost pressure switch
faulty.
Wire 1955 faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Voltage test.
STE/ICE-R #89.
If wire 1957 is loose, faulty, or
shorted to ground, 22 to 28 vdc
will not be present at turbo
boost pressure switch.
Repair wire 1957
(see schematic
Fig 2-67) or notify DS
Maintenance.
Verify repair, go to
Step 19 of this Fault.
WARNING
Read WARNING
on Page 2-2933
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