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TM 9-2320-364-20-2
2-1476
34. ENGINE BRAKE DOES NOT OPERATE IN LOW (CONT).
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 IOK.
Wire 213 OK.
ATEC ECU OK.
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 10 to 14 vdc are not
measured, retarder relay R8
is faulty.
If 10 to 14 vdc are measured,
wire 1716 is faulty.
YES
NO
Replace retarder relay
R8 (Para 7-95).
Verify repair, go to
Step 18 of this Fault.
16.
Are 10 to 14 vdc measured on
wire 1716 at retarder relay R8,
terminal 87?
Repair wire 1716 (see
schematic Fig 2-37)
or notify DS
Maintenance.
Verify repair, go to
Step 18 of this Fault.
WARNING
Read WARNING
on Page 2-1477
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