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

TM 9-2320-366-20-3

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

m6.

(CONT)

WARNING

KNOWN INFO

TEST OPTIONS

Read WARNING

Circuit breakers OK.

Voltage Test or

on following page.

Power supplied to CTIS.

STE/ICE-R Test #89

Is 24 vdc present on P111D

REASON FOR QUESTION

Speedometer OK.

power input to CTIS

CTIS overspeed indicator

Indicator display lights OK.

harness for warning light?

will not work without 24

CTIS cable-speed signal

vdc to P111D.

OK.

Cab dashboard wiring

harness - speed signal OK.

POSSIBLE PROBLEMS

Faulty cab dashboard

wiring harness - LED input

Repair wire 1793 (para 2-45)

to CTIS cable.

or replace WTEC II dashboard cable

Faulty CTIS cable - LED

assembly (para 7-10) or WTEC III

input to ECU.

YES

dashboard cable assembly (para 7-11).

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.

2-2128