TM-9-2320-272-23-2
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 2 OF 5
SEPTEMBER 2012
TM-9-2320-272-23-2 - Page 298 of 1417
NG30: ENGINE CRANK - NO START - Continued
CONDITION/INDICATION
Is offset value within limits -150 to +150?
DECISION
YES - Go to Step (4).
NO - Proceed to TM 9-4910-571-12&P for offset fault isolation.
STEP
4.
Perform fuel pressure test.
a.
Turn on fuel and accessory switch.
b.
Dial 50 into TEST SELECT and press TEST.
Table
2.
Pressure Test.
TEST NO.
TEST
50
0-1,000 PSIG Pressure
c.
Crank engine and watch readout display.
d.
Number on display should be above 3 PSI (21 kPa).
CONDITION/INDICATION
Is fuel pressure above limit specified?
DECISION
YES - Go to Step (5).
NO - Go to Step (6).
STEP
5.
Check engine shutoff device and air intake system, and retest system.
a.
Refer to TM 9-2320-272-10 for proper operation of engine shutoff device.
b.
Check for restricted air intake.
c.
Attempt to start engine (TM 9-2320-272-10).
CONDITION/INDICATION
Does engine start?
DECISION
YES - After completing repair, rerun GO-Chain tests to verify problem is solved and no other problem exists.
NO - If engine still does not start and weather is cold, perform Engine Cranks But Will Not Start In Cold Weather
(Fuel System Operating Properly) troubleshooting (Volume 1, WP
0021).
TM 9-2320-272-23-2
0199
0199-3
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