TM-9-2320-272-23-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 1 OF 5
SEPTEMBER 2012
TM-9-2320-272-23-1 - Page 1268 of 1313
LOSS OF AMBER WARNING LIGHT AND/OR OVERSPEED LIGHT - Continued
STEP
3.
DOES WARNING LIGHT FLASH CORRECTLY?
a.
Select EMERGENCY on ECU to deflate CTIS.
T0462DAA
ECU
EMER
(EMGERENCY)
CTIS AMBER
WARNING LIGHT
Figure 2.
CTIS Electronic Control Unit.
NOTE
The ECU limits time spent in the EMERGENCY mode to ten minutes. Emergency mode
must be re-selected to maintain correct test conditions.
b.
Monitor amber warning light as air pressure is reduced. Verify warning light flashes when emergency
pressure is obtained (steady emergency mode light).
c.
Turn on blackout light switch. Verify amber warning light goes out.
CONDITION/INDICATION
DOES WARNING LIGHT FLASH CORRECTLY?
DECISION
YES - Go to Step (7) to verify problem is solved.
NO - Go to Step (4).
TM 9-2320-272-23-1
0150
0150-3
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