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

TM 9-2320-364-20-4 2-2996 2. DIFFERENTIAL SIDE TO SIDE LOCKUP WILL NOT ENGAGE WITH CTIS IN EMERGENCY WITH TRANSFER CASE IN LOW (CONT). 11. Is continuity measured between HI RANGE LOCKOUT relay R23, terminals 30 and 87? Replace HI RANGE LOCKOUT relay R23 (Para 7-95). 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 OK. Wire 1885 OK. CTIS controller OK. Wire 1435 OK. 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. HI RANGE LOCKOUT relay R23 is faulty if 24 vdc is measured. WARNING 12. Is continuity measured on wire 1885 between HI RANGE LOCKOUT relay R23, terminal 87 and DIFF LOCK relay R21, terminal 85? Repair wire 1885 (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 OK. Wire 1885 OK. CTIS controller OK. Wire 1435 OK. HI RANGE LOCKOUT relay R23 OK 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 Continuity test. STE/ICE–R #91. If there is no continuity, DIFF LOCK relay R21 will not operate. WARNING Read WARNING on Page 2-2997 Read WARNING on Page 2-2997