Quantcast 34.  ENGINE BRAKE DOES NOT OPERATE IN LOW (CONT) - TM-9-2320-364-20-2_688

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Page Title: 34. ENGINE BRAKE DOES NOT OPERATE IN LOW (CONT)
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CONTINUITY TEST - TM-9-2320-364-20-2_687
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VOLTAGE TEST - TM-9-2320-364-20-2_689
TM 9-2320-364-20-2 2-1464 34.  ENGINE BRAKE DOES NOT OPERATE IN LOW (CONT). 9. Replace DDEC II ECM (Para 7-56) or DDEC III ECM (Para 7-57). 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 faulty. TRANS relay R7 faulty. Wire 1839 faulty. Wire 211 faulty. 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 voltage does not reduce to zero (0) vdc while engine decelerates, DDEC ECM is faulty. WARNING Is less than 10 vdc measured on wire 508 at TRANS relay R7, terminal 85 with engine speed decreasing from 2000 RPM? Read   WARNING on Page 2-1465

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