TM 9-2320-365-20-2
2-1884
NO
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.
If overspeed warning light
failed, warning lamp or
warning lamp circuit may
be faulty.
Was the overspeed light
the function that failed
during road test?
Visual inspection
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Circuit breaker OK.
Power supplied to CTIS.
Speedometer OK.
Indicator display lights OK.
CTIS cable-speed signal
OK.
Cab dashboard wiring
harness - speed signal OK.
Cab dashboard wiring
harness - LED input to
CTIS cable OK.
CTIS cable - LED input
to ECU OK.
6.
Replace CTIS ECU
(para 12-6).
m6. CTIS OVERSPEED WARNING LIGHT DOES NOT ILLUMINATE AND/OR OVERSPEED PRESSURE CHANGE
(CONT)