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TM 9-2320-364-20-4
2-2994
2. DIFFERENTIAL SIDE TO SIDE LOCKUP WILL NOT ENGAGE WITH CTIS IN
EMERGENCY WITH TRANSFER CASE IN LOW (CONT).
9.
Go to Step 14 of this
Fault.
YES
NO
Dash lights operate indicating
circuit breaker CB8 OK.
Horn operates indicating circuit
breaker CB16 OK.
Air lines and fittings are OK.
Differential lockup solenoid
valve OK.
Wire 1435 OK.
Differential lockup solenoid OK.
Wire 1882 OK.
Wire 1888 OK.
Wire 1885 OK.
CTIS controller OK.
Wire 1435 faulty.
HI RANGE LOCKOUT relay
R23 faulty.
Wire 1885 faulty.
Wire 1890 faulty.
DIFF LOCK relay R21 faulty.
Wire 1093 faulty.
Start switch S13 faulty.
Wire 1095 faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Voltage test.
STE/ICE-R #89.
If 22 to 28 vdc are not present at
HI RANGE LOCKOUT relay
R23, terminal 86, relay R23 will
not operate.
WARNING
10.
Repair wire 1435 (see
schematic Fig 2-72)
or notify DS
Maintenance.
Verify repair, go to
Step 16 of this Fault.
YES
NO
Dash lights operate indicating
circuit breaker CB8 OK.
Horn operates indicating circuit
breaker CB16 OK.
Air lines and fittings OK.
Differential lockup solenoid
valve OK.
Wire 1435 OK.
Differential lockup solenoid OK.
Wire 1882 OK.
Wire 1888 OK.
Wire 1885 OK.
CTIS controller OK.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Continuity test.
STE/ICE-R #91.
If wire 1435 is faulty, HI RANGE
LOCKOUT relay R23 will not
operate.
WARNING
Are 22 to 28 vdc measured on
wire 1095 at HI RANGE
LOCKOUT relay R23, terminal
86?
Is continuity measured
between wire 1435 at HI
RANGE LOCKOUT relay R23,
terminal 85 and a known good
ground?
Wire 1435 faulty.
HI RANGE LOCKOUT relay
R23 faulty.
Wire 1885 faulty.
Wire 1890 faulty.
DIFF LOCK relay R21 faulty.
Wire 1093 faulty.
Start switch S13 faulty.
Wire 1095 faulty.
Read WARNING
on Page 2-2995
Read WARNING
on Page 2-2995
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