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TM 9-2320-364-20-4
2-2998
2. DIFFERENTIAL SIDE TO SIDE LOCKUP WILL NOT ENGAGE WITH CTIS IN
EMERGENCY WITH TRANSFER CASE IN LOW (CONT).
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.
Wire 1435 OK.
HI RANGE LOCKOUT relay
R23 faulty.
Wire 1885 OK.
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 10 to 14 vdc are not present at
DIFF LOCK relay R21, terminal
87 when transfer case is in
LOW, relay R21 is faulty and
power will not be supplied to the
differential solenoid valve.
YES
NO
Replace DIFF LOCK
relay R21 (Para 7-95).
Verify repair, go to
Step 16 of this Fault.
13.
Are 10 to 14 vdc measured on
wire 1890 DIFF LOCK relay
R21, terminal 87?
Repair wire 1890 (see
schematic Fig 2-72)
or notify DS
Maintenance.
WARNING
Read WARNING
on Page 2-2999
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