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TM 9-2320-364-20-3
2-2920
6. FAN SPEED DOES NOT LOWER FROM HIGH SPEED TO LOW SPEED (CONT).
9.
Repair wire 1935 or
1936 (see schematic
Fig 2-67) or notify DS
Maintenance.
Verify repair, go to
Step 19 of this Fault.
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 operates at low speed with
throttle position switch
depressed.
Wire 1933 between MC59 and
MC128 OK.
Wire 1932 between MC59 and
MC61 OK.
Wire 1932 between MC61 and
MC128 OK.
Temperature sensor OK.
Wire 1538 OK.
Wire 1435 from fan
controller OK.
Wire 1935 or 1936 between
MC59 and MC76 faulty.
Temperature switch faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Continuity test.
STE/ICE-R #91.
If wire 1935 or 1936 between
connectors MC59 and MC76 is
loose, faulty, or shorted to
ground, fan controller will
automatically operate fan at
high speed.
WARNING
Is con-
tinuity
measured
between connectors MC59,
terminal C and MC76, terminal
B and also between
connectors MC59, terminal D
and MC76, terminal A?
Read WARNING
on Page 2-2921
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