TM 9-2320-364-20-2 2-1472 34.  ENGINE BRAKE DOES NOT OPERATE IN LOW (CONT). 13. Repair wire 1871 (see schematic Fig 2-38) or notify DS Maintenance. Verify repair, go to Step 18 of this Fault. YES NO Reverse light operates   indicating 10 to 14 vdc to wire   1871. Dash lights operate indicating   10 to 14 vdc to circuit breaker   CB7. Engine brake harness OK. Engine brake circuit breaker   CB7 OK. Wire 1712 OK. Engine brake switch OK. Wire 1713 OK. Wire 1711 OK. Wire 508 OK. DDEC ECM OK. TRANS relay R7 OK. Wire 1839 OK. Wire 211 OK. Relay R8 wire 1871 faulty. Wire 213 faulty. ATEC ECU faulty. Retarder relay R8 faulty. Wire 1716 faulty. Circuit breaker CB11 wire 1871   faulty. Wire 1711 faulty. KNOWN INFO POSSIBLE PROBLEMS TEST OPTIONS REASON FOR QUESTION Voltage test. STE/ICE-R #89. If wire 1871 is loose, faulty, or shorted to ground, engine brakes will not operate. WARNING 14. Repair wire 213 (see schematic Fig 2-38) or notify DS Maintenance. Verify repair, go to Step 18 of this Fault. YES NO Reverse light operates   indicating 10 to 14 vdc to wire   1871. Dash lights operate indicating   10 to 14 vdc to circuit breaker   CB7. Engine brake harness OK. Circuit breaker CB7 OK. Wire 1712 OK. Engine brake switch OK. Wire 1713 OK. Wire 1711 OK. Wire 508 OK. DDEC ECM OK. TRANS relay R7 OK. Wire 1839 OK. Wire 211 OK. Relay R8 wire 1871 OK. Wire 213 faulty. ATEC ECU faulty. Retarder relay R8 faulty. Wire 1716 faulty. Circuit breaker CB11 wire 1871   faulty. Wire 1711 faulty. KNOWN INFO POSSIBLE PROBLEMS TEST OPTIONS REASON FOR QUESTION Continuity test. STE/ICE-R #91. If continuity is not measured, wire 213 is faulty. WARNING Are 10 to 14 vdc measured on wire 1871 at retarder relay R8, terminal 86? Is continuity measured on wire 213 between retarder relay R8, terminal 85 and connector MC9, terminal 3D? Read   WARNING on Page 2-1473 Read   WARNING on Page 2-1473