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TM 9-2320-364-20-3
2-2910
6. FAN SPEED DOES NOT LOWER FROM HIGH SPEED TO LOW SPEED (CONT).
2.
Go to Step 14 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.
Wire 1933 between MC59 and
MC128 faulty.
Wire 1932 between MC59 and
MC61 faulty.
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.
Wire 1956 faulty.
Throttle position switch faulty.
Wire 1957 faulty.
Turbo boost pressure switch
faulty.
Wire 1955 faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Operation test.
Isolate fault.
WARNING
Does fan speed lower with
throttle position switch
depressed?
Read WARNING
on Page 2-2911
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