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 327 of 1417
NG90: GOVERNOR/POWER TEST FAULT ISOLATION - Continued
STEP
4.
Perform high idle fuel pressure test.
a.
Turn on fuel and accessory switch.
b.
Dial test number into TEST SELECT and press TEST.
Table
1.
Pressure Test.
VEHICLE
TEST NO.
TEST
M939/A1
50
0-1,000 PSIG Pressure
M939A2
24
c.
Start engine (TM 9-2320-272-10).
d.
Accelerate engine to high idle.
e.
Display fuel pressure should be greater then minimum value.
Table
2.
Minimum Fuel Pressure.
VEHICLE
MINIMUM FUEL PRESSURE
M939/A1
25 PSI (172 kPa)
M939A2
15 PSI (103 kPa)
CONDITION/INDICATION
Is fuel pressure OK?
DECISION
YES - Go to Step (5).
NO - Check for crimped or broken fuel lines. Drain fuel filter and check for water or dirt. Replace if necessary,
Check vehicle throttle linkage for full travel and proper adjustment. After completing repair, rerun GO-Chain tests
to verify the problem is fixed and no other problems exist.
TM 9-2320-272-23-2
0204
0204-4
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