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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
6.
Circuit breaker OK.
Visual inspection
Power supplied to CTIS.
REASON FOR QUESTION
Was the overspeed light
If overspeed warning light
Speedometer OK.
the function that failed
failed, warning lamp or
Indicator display lights OK.
during road test?
warning lamp circuit may
CTIS cable-speed signal
be faulty.
OK.
Cab dashboard wiring
harness - speed signal OK.
Cab dashboard wiring
NO
harness - LED input to
CTIS cable OK.
CTIS cable - LED input
to ECU OK.
Replace CTIS ECU
POSSIBLE PROBLEMS
(para 12-6).
YES
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.
2-2132
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