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)

KNOWN INFO

TEST OPTIONS

Circuit breakers OK.

Continuity Test or

Power supplied to CTIS.

STE/ICE-R Test #91

Is continuity present

REASON FOR QUESTION

Speedometer OK.

CTIS overspeed warning

from J111B to PX8-4?

Indicator display lights OK.

light and overspeed

CTIS cable-speed signal

pressure change will not

OK.

POSSIBLE PROBLEMS

operate if CTIS ECU does

Faulty cab dashboard

not receive speed signal

wiring harness - speed

through cab dashboard

signal.

wiring harness.

Faulty cab dashboard

Repair wire 1793 (para 2-45)

wiring harness - LED input

or replace WTEC II dashboard cable

to CTIS cable.

assembly (para 7-10) or WTEC III

Faulty CTIS cable - LED

YES

dashboard cable assembly (para 7-11).

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.

2-2126