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

10.

Circuit breaker OK.

Continuity Test or

Power supplied to CTIS.

STE/ICE-R Test #91

Speedometer OK.

Is continuity present from

REASON FOR QUESTION

Indicator display lights OK.

CTIS overspeed indicator

P111D to P110E?

CTIS cable-speed signal

requires continuity from

OK.

P111D to P110E.

Cab dashboard wiring

harness - speed signal OK.

Cab dashboard wiring

harness - LED input to

CTIS cable OK.

CTIS cable - LED input

to ECU OK.

Repair wire 1528 (para 2-45)

ECU - O.S. pressure

or replace CTIS cable

YES

change function OK.

assembly (para 7-60).

Overspeed indicator

LED OK.

Cab dashboard wiring

harness - ground for

LED OK.

Cab dashboard wiring

harness - power to LED OK.

POSSIBLE PROBLEMS

Faulty CTIS cable power

to LED.

Faulty ECU - O.S. warning

indicator function.

Replace CTIS ECU

(para 12-6).

2-2140