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Page Title: 2. DIFFERENTIAL SIDE TO SIDE LOCKUP WILL NOT ENGAGE WITH CTIS IN EMERGENCY WITH TRANSFER CASE IN LOW (CONT)
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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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