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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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