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TM 9-2320-364-20-4
2-3006
3. INTERAXLE FRONT TO REAR LOCKUP WILL NOT ENGAGE WITH CTIS IN MUD,
SAND AND SNOW (CONT).
2.
Do interaxle lockups engage
by turning the manual over-
ride screw on interaxle lockup
solenoid valve M50?
Replace interaxle
lockup solenoid valve
(Para 12-40).
Verify repair, go to
Step 10 of this Fault.
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
faulty.
Wire 1435 faulty.
Interaxle lockup solenoid faulty.
Wire 1882 faulty.
Wire 1888 faulty.
Wire 1884 faulty.
CTIS controller faulty.
INTERAXLE relay R20 faulty.
Wire 1889 faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Solenoid valve test.
If the interaxle lockups engage
by manually overriding the
interaxle lockup solenoid valve,
solenoid M50 is faulty.
3.
Are 10 to 14 vdc measured on
wire 1889 on interaxle lockup
solenoid, terminal 1?
Go to Step 5 of this
Fault.
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 OK.
Wire 1435 faulty.
Interaxle lockup solenoid faulty.
Wire 1882 faulty.
Wire 1888 faulty.
Wire 1884 faulty.
CTIS controller faulty.
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 solenoid M50, terminal
1, interaxle lockup solenoid valve
will not operate.
WARNING
Read WARNING
on Page 2-3007
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