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TM 9-2320-364-20-3
2-2914
6. FAN SPEED DOES NOT LOWER FROM HIGH SPEED TO LOW SPEED (CONT).
5.
Repair wire 1932
(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 faulty.
Temperature sensor faulty.
Wire 1538 faulty.
Wire 1435 from fan controller
faulty.
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 1932 between connectors
MC61 and MC128 is loose,
faulty or shorted to ground, fan
controller will automatically
operate fan at high speed.
WARNING
Is continuity measured
between connectors, MC61
terminal B and MC128
terminal B?
Read WARNING
on Page 2-2915
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