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TM 9-2320-364-20-4
2-2988
2. DIFFERENTIAL SIDE TO SIDE LOCKUP WILL NOT ENGAGE WITH CTIS IN
EMERGENCY WITH TRANSFER CASE IN LOW (CONT).
5.
Repair wire 1882 (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 faulty.
Wire 1888 faulty.
Wire 1885 faulty.
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
Voltage test.
STE/ICE-R #89.
If 10 to 14 vdc are present at
DIFF LOCK relay R21, terminal
30, power will not be supplied to
differential solenoid valve.
WARNING
6.
Repair wire 1888 (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 faulty.
Wire 1885 faulty.
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
Voltage test.
STE/ICE-R #89.
If 22 to 28 vdc are not present at
DIFF LOCK relay R21, terminal
86, relay R21 will not operate.
WARNING
Are 10 to 14 vdc measured on
wire 1882 at DIFF LOCK relay
R21, terminal 30?
Are 22 to 28 vdc measured on
wire 1888 at DIFF LOCK relay
R21, terminal 86?
Read WARNING
on Page 2-2989
Read WARNING
on Page 2-2989
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