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Page Title: Figure 2-55. Multiple "Xu" Messages for Two-Branch Configuration Flowchart
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TM-11-5830-263-20&P
START
USING SYSTEM CONFIG DIAGRAM FOR
YOUR VEHICLE, DETERMINE IF FAULTS
ARE SEQUENCE OF FFCSs/RITs AT END
OF BRANCH
ONE AT A TIME, SUBSTITUTE
END
NO
KNOWN GOOD FFCS OR RIT
SEQUENCE
FOR EACH FAULT FFCS/RIT
?
YES
REINSTALL
DISCONNECT CABLE TO
FFCS/RIT FOR
ANY
NO
CHANGE
LAST FFCS/RIT
WHICH
?
SUBSTITUTION
WAS MADE
YES
ONLY
YES
DISCONNECTED
REPLACE LAST
BOXES DISPLAYED
FFCS/RIT REMOVED
?
NO
DISCONNECT
ONE
CABLES FROM
NO
AT STATION CONNECTOR OF NEXT
FAULT FFCS/
NEXT BOX
FFCS/RIT/MCS THAT IS CLOSEST IN
RIT LEFT
TOWARD MCS
?
PATH TO SUBSTITUTED BOX,
MEASURE VOLTAGE BETWEEN PIN A
YES
AND PIN B.
SUBSTITUTE KNOWN GOOD FFCS
OR RIT FOR REMAINING FAULT
FFCS/RIT
REPLACE
YES
BETWEEN
MEASURED
-16V AND +16V
ONLY
BOX
?
DISCONNECTED
NO
BOXES DISPLAYED
NO
?
AT ABOVE CONNECTOR,
YES
MEASURE VOLTAGE
BETWEEN PIN D AND PIN C.
REPLACE LAST FFCS/RIT
REMOVED
REPLACE
NO
MEASURED
24 VOLTS
BOX
PRESENT
?
YES
STATION CONNECTOR
PIN ARRANGEMENT
CHECK CONTINUITY OF ALL
CABLES/MOSs BETWEEN MEASURED
A
A = DATA + LINE
B
BOX AND SUBSTITUTED BOX
B = DATA - LINE
G
F
C = SYS PWR GND
C
D = SYS PWR
REPLACE
E
ALL
E = ANR PWR
NO
D
DEFECTIVE
OK
F = ANR PWR GND
?
CABLE/MOS
G = INT ANALOG
YES
PROBLEM IS IN VEHICLE
WIRING (E.G., SLIP RING)
Figure 2-55. Multiple "Xu" Messages for Two-Branch Configuration Flowchart


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