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TM 9-2320-364-20-4
2-2992
2. DIFFERENTIAL SIDE TO SIDE LOCKUP WILL NOT ENGAGE WITH CTIS IN
EMERGENCY WITH TRANSFER CASE IN LOW (CONT).
8.
Replace CTIS
controller (Para 13-7).
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 faulty.
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
Continuity test.
STE/ICE-R #91.
If continuity is not measured at
relay R23, terminal 30 and a
known good ground, CTIS con-
troller is faulty and the DIFF
LOCK and HI RANGE LOCK-
OUT relays R21 and R23 will
not operate.
WARNING
Is continuity measured
between HI RANGE LOCKOUT
relay R23, terminal 30 and a
known good ground?
Read WARNING
on Page 2-2993
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