CTIS OVERSPEED WARNING LIGHT DOES NOT ILLUMINATE AND/OR OVERSPEED PRESSURE CHANGE

TM 9-2320-366-20-3

m6. CTIS OVERSPEED WARNING LIGHT DOES NOT ILLUMINATE AND/OR OVERSPEED PRESSURE CHANGE

INITIAL SETUP

Equipment Conditions

Tools and Special Tools

Engine running (TM 9-2320-366-10-1).

Tool Kit, Genl Mech (Item 46, Appendix C)

Multimeter, Digital (Item 22, Appendix C)

Personnel Required

Wrench, Torque, 0-200 lb-in. (Item 59, Appendix C)

(2)

Wrench, Torque, 0-75 lb-in. (Item 90, Appendix B)

STE/ICE-R (Item 41, Appendix C)

References

TM 9-4910-571-12&P

START

KNOWN INFO

TEST OPTIONS

Visual inspection

Circuit breakers OK.

Do overspeed warning

REASON FOR QUESTION

Power supplied to CTIS.

If ECU does not receive a

light and overspeed

Speedometer OK.

speed signal it cannot

pressure change bolts

Indicator display lights OK.

activate the overspeed

fail to operate?

POSSIBLE PROBLEMS

protection system.

Faulty CTIS cable-speed

signal.

Faulty cab dashboard

wiring harness - speed

signal.

Faulty cab dashboard

wiring harness - LED input

to CTIS cable.

Go to step 6 of this fault.

Faulty CTIS cable - LED

YES

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.

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