TM 9-2320-365-20-2
2-1878
NO
YES
Is continuity present
from J111B to PX8-4?
KNOWN INFO
POSSIBLE PROBLEMS
Faulty cab dashboard
wiring harness - speed
signal.
Faulty cab dashboard
wiring harness - LED input
to CTIS cable.
Faulty CTIS cable - LED
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.
TEST OPTIONS
Circuit breakers OK.
Power supplied to CTIS.
Speedometer OK.
Indicator display lights OK.
CTIS cable-speed signal
OK.
3.
Continuity Test or
STE/ICE-R Test #91
REASON FOR QUESTION
CTIS overspeed warning
light and overspeed
pressure change will not
operate if CTIS ECU does
not receive speed signal
through cab dashboard
wiring harness.
Repair wire 1793 (para 2-40)
or replace WTEC II dashboard cable
assembly (para 7-10) or WTEC III
dashboard cable assembly (para 7-11).
m6. CTIS OVERSPEED WARNING LIGHT DOES NOT ILLUMINATE AND/OR OVERSPEED PRESSURE CHANGE
(CONT)
