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

Continuity Test or

Circuit breaker OK.

STE/ICE-R Test #91

Power supplied to CTIS.

Is continuity present from

REASON FOR QUESTION

Speedometer OK.

CTIS overspeed indicator

PX7-17 to ground?

Indicator display lights OK.

requires continuity from

CTIS cable-speed signal

PX7-17 to ground.

OK.

Cab dashboard wiring

harness - speed signal OK.

Cab dashboard wiring

harness - LED input to

CTIS cable OK.

Repair wire 3130 (para 2-45)

CTIS cable - LED input

or replace WTEC II dashboard cable

to ECU OK.

YES

assembly (para 7-10) or WTEC III

ECU - O.S. pressure

dashboard cable assembly (para 7-11).

change function OK.

Overspeed indicator

LED OK.

POSSIBLE PROBLEMS

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.

2-2136