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 883 of 1313
OIL PRESSURE GAUGE INOPERATIVE (OIL LEVEL IS CORRECT) - Continued
STEP
3.
IS THERE BATTERY VOLTAGE AT OIL PRESSURE GAUGE?
a.
Check for battery voltage at oil pressure gauge.
b.
Place battery switch to the OFF position.
c.
Refer to point to point schematics.
T0634DAA
TEST POINT
27
27
27
27
27
Figure 3.
Oil Pressure Gauge Voltage Test.
d.
Disconnect circuit 27 wire from inoperative oil pressure gauge.
e.
Set multimeter to measure VDC.
f.
Place battery switch to ON position.
g.
Connect multimeter probe red lead to disconnected circuit 27 wire.
h.
Connect multimeter probe black lead to vehicle chassis ground.
i.
Meter reading should be greater than or equal to 18 VDC.
CONDITION/INDICATION
IS THERE BATTERY VOLTAGE AT OIL PRESSURE GAUGE?
DECISION
YES - Replace defective gauge (Volume 2, WP
0312). Go to Step (4) to verify problem is solved.
NO - Replace instrument cluster wiring harness (Volume 3, WP
0351). Go to Step (4) to verify problem is solved.
TM 9-2320-272-23-1
0103
0103-6
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