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TM 9-2320-364-20-2
2-1474
34. ENGINE BRAKE DOES NOT OPERATE IN LOW (CONT).
15.
Replace ATEC ECU
(Para 7-71).
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 OK.
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, ATEC ECU
is faulty.
WARNING
Is zero (0) vdc measured on
wire 213 at retarder relay R8,
terminal 85 with engine speed
decreasing from 2000 RPM?
Read WARNING
on Page 2-1475
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