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TM 9-2320-364-20-4
2-3014
3. INTERAXLE FRONT TO REAR LOCKUP WILL NOT ENGAGE WITH CTIS IN MUD,
SAND AND SNOW (CONT).
Dash lights operate indicating
circuit breaker CB8 OK.
Horn operates indicating circuit
breaker CB16 OK.
Air system OK indicating air
input to interaxle lockup
solenoid valve.
Interaxle lockup cylinder hoses
OK.
Interaxle lockup solenoid valve
OK.
Wire 1435 OK.
Interaxle lockup solenoid OK.
Wire 1882 OK.
Wire 1888 OK.
Wire 1884 OK.
CTIS controller OK.
INTERAXLE relay R20 faulty.
Wire 1889 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
INTERAXLE relay R20, terminal
87, relay R20 is faulty and power
will not be supplied to the
interaxle lockup solenoid valve.
YES
NO
Replace INTERAXLE
relay R20 (Para 7-95).
Verify repair, go to Step
10 of this Fault.
9.
Are 10 to 14 vdc measured on
INTERAXLE relay R20,
terminal 87?
Repair wire 1889 (see
schematic Fig 2-72)
or notify DS
Maintenance.
Verify repair, go to
Step 10 of this Fault.
8.
Is continuity measured on wire
1435 between INTERAXLE
relay R20, terminal 85 and a
known good ground?
YES
NO
Dash lights operate indicating
circuit breaker CB8 OK.
Horn operates indicating circuit
breaker CB16 OK.
Air system OK indicating air
input to interaxle lockup
solenoid valve.
Interaxle lockup cylinder hoses
OK.
Interaxle lockup solenoid valve
OK.
Wire 1435 OK.
Interaxle lockup solenoid OK.
Wire 1882 OK.
Wire 1888 OK.
Wire 1884 OK.
CTIS controller faulty.
INTERAXLE relay R20 faulty.
Wire 1889 faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Continuity test.
STE/ICE-R #91.
If there is no continuity between
INTERAXLE relay R20, terminal
85 and a known good ground,
relay R20 will not operate.
WARNING
WARNING
Replace CTIS
controller (Para 13-7).
Verify repair, go to
Step 10 of this Fault.
Read WARNING
on Page 2-3015
Read WARNING
on Page 2-3015
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