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 908 of 1313
FUEL GAUGE INOPERATIVE - Continued
STEP
3.
IS FUEL SELECTOR SWITCH IN GOOD OPERATING CONDITION?
a.
Check for 5 to 8 VDC at circuit 28 wire pin A.
b.
Refer to point to point schematics.
T0090DAA
28
28
29
Figure 3.
Fuel Selector Switch.
c.
Place battery switch to the OFF position.
d.
Disconnect circuit 28 wire from fuel selector switch pin A.
e.
Place battery switch to ON position.
f.
Connect multimeter red lead to disconnected circuit 28 wire.
g.
Connect multimeter black lead to vehicle chassis ground.
NOTE
If 5 to 8 VDC is present, fuel selector switch is faulty.
h.
Meter reading should be between 5 and 8 VDC.
CONDITION/INDICATION
IS FUEL SELECTOR SWITCH IN GOOD OPERATING CONDITION?
DECISION
YES - Go to Step (4).
NO - Replace fuel selector switch (Volume 2, WP
0314). Go to Step (6) to verify problem is solved.
TM 9-2320-272-23-1
0107
0107-5
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