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TM 9-2320-364-20-2
2-1478
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.
Engine brake(s) 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 OK.
Retarder relay R8 OK.
Wire 1716 OK.
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, wire 1871 is faulty.
If 10 to 14 vdc are measured,
wire 1711 is faulty.
YES
NO
Repair wire 1871
(see schematic
Fig 2-38) or notify
DS Maintenance.
Verify repair, go to
Step 18 of this Fault.
17.
Are 10 to 14 vdc measured on
wire 1871 at DDEC trans
circuit breaker CB11?
Repair wire 1711
(see schematic
Fig 2-38) or notify
DS Maintenance.
Verify repair, go to
Step 18 of this Fault.
WARNING
Read WARNING
on Page 2-1479
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