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TM 9-2320-364-20-2
2-1452
34. ENGINE BRAKE DOES NOT OPERATE IN LOW.
INITIAL SETUP
1.
Go to Step 3 of this
Fault.
START
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 faulty.
Circuit breaker CB7 faulty.
Wire 1712 faulty.
Engine brake switch faulty.
Wire 1713 faulty.
Wire 1711 faulty.
Wire 508 faulty.
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 10 to 14 vdc are not
measured, engine brake will not
operate in low.
2-20. ELECTRICAL SYSTEM TROUBLESHOOTING (CONT).
Tools and Special Tools
Tool Kit, General Mechanic’s: Automotive
(Item 74, Appendix G)
STE/ICE-R (optional) (Item 3, Appendix G)
Multimeter (Item 44, Appendix G)
Jumperwire
Personnel Required
Two
Equipment Condition
Engine OFF, (TM 9-2320-364-10)
Parking brake applied, (TM 9-2320-364-10)
Wheels chocked, (TM 9-2320-364-10)
Top engine access cover opened,
(TM 9-2320-364-10)
References
TM 9-2320-364-10
TM 9-4910-571-12&P
Materials/Parts
Lockwasher (8) (Item 195, Appendix F)
Are 10 to 14 vdc measured on
wire 1716 at engine brake
harness connector end?
WARNING
Read WARNING
on Page 2-1453
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