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TM 9-2320-364-20-4
2-2984
2. DIFFERENTIAL SIDE TO SIDE LOCKUP WILL NOT ENGAGE WITH CTIS IN
EMERGENCY WITH TRANSFER CASE IN LOW (CONT).
2.
Do differential lockups
engage by turning the manual
override screw on differential
lockup solenoid valve?
Replace solenoid
valve (Para 12-40 and
schematic Fig 2-74).
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 faulty.
Wire 1435 faulty.
Differential lockup solenoid
faulty.
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
Solenoid valve test.
If the differential lockups engage
by manually overriding the
differential lockup solenoid valve,
solenoid is faulty.
3.
Are 10 to 14 vdc measured on
wire 1890 at differential
lockup solenoid connector,
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 lines and fittings OK.
Differential lockup solenoid
valve OK.
Wire 1435 faulty.
Differential lockup solenoid
faulty.
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 not present at
solenoid, terminal 1, differential
solenoid valve will not operate.
WARNING
Read WARNING
on Page 2-2985
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