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Page Title:
CTIS OVERSPEED WARNING LIGHT DOES NOT ILLUMINATE AND/OR OVERSPEED PRESSURE CHANGE (cont) |
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 TM 9-2320-366-20-3
TM
m6. CTIS OVERSPEED WARNING LIGHT DOES NOT ILLUMINATE AND/OR OVERSPEED PRESSURE CHANGE
m6.
(CONT)
KNOWN INFO
TEST OPTIONS
2.
Circuit breakers OK.
Continuity Test or
Power supplied to CTIS.
STE/ICE-R Test #91
Speedometer OK.
Is continuity present
REASON FOR QUESTION
Indicator display lights OK.
from P110U to P111B?
CTIS overspeed warning
light and overspeed
POSSIBLE PROBLEMS
pressure change will not
Faulty CTIS cable-speed
operate if CTIS ECU does
signal.
not receive speed signal
Faulty cab dashboard
through CTIS cable
wiring harness - speed
NO
assembly.
signal.
Faulty cab dashboard
wiring harness - LED input
Repair wire 1528 (para 2-45)
to CTIS cable.
or replace CTIS cable
Faulty CTIS cable - LED
YES
assembly (para 7-60).
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.
2-2124
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