TM 9-2320-365-20-2
2-1874
1.
NO
YES
If ECU does not receive a
speed signal it cannot
activate the overspeed
protection system.
Do overspeed warning
light and overspeed
pressure change bolts
fail to operate?
START
Visual inspection
KNOWN INFO
POSSIBLE PROBLEMS
Faulty CTIS cable-speed
signal.
Faulty cab dashboard
wiring harness - speed
signal.
Faulty cab dashboard
wiring harness - LED input
to CTIS cable.
Faulty CTIS cable - LED
input to ECU.
Faulty ECU - O.S pressure
change function.
Faulty overspeed indicator
LED.
Faulty cab dashboard
wiring harness - ground
for LED.
Faulty cab dashboard
wiring harness - power
to LED.
Faulty CTIS cable power
to LED.
Faulty ECU - O.S. warning
indicator function.
TEST OPTIONS
REASON FOR QUESTION
Circuit breakers OK.
Power supplied to CTIS.
Speedometer OK.
Indicator display lights OK.
INITIAL SETUP
Equipment Conditions
Engine running (TM 9-2320-365-10).
Personnel Required
(2)
References
TM 9-4910-571-12&P
m6. CTIS OVERSPEED WARNING LIGHT DOES NOT ILLUMINATE AND/OR OVERSPEED PRESSURE CHANGE
Tools and Special Tools
Tool Kit, Genl Mech (Item 44, Appendix C)
Multimeter, Digital (Item 22, Appendix C)
Wrench, Torque, 0-200 lb-in. (Item 58, Appendix C)
Wrench, Torque, 0-75 lb-in. (Item 86, Appendix B)
STE/ICE-R (Item 39, Appendix C)
Go to step 6 of this fault.
