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 902 of 1313
TEMPERATURE GAUGE INOPERATIVE (COOLANT) - Continued
STEP
3.
IS THERE BATTERY VOLTAGE AT COOLANT TEMPERATURE GAUGE?
a.
Check for battery voltage at coolant temperature gauge.
b.
Place battery switch to the OFF position.
c.
Refer to point to point schematics.
T0087DAA
27
Test Point
27
27
27
27
Figure 3.
Coolant Temperature Gauge Voltage Test.
d.
Disconnect circuit 27 wire from inoperative coolant temperature gauge.
e.
Place battery switch to ON position.
f.
Set multimeter to measure VDC.
g.
Connect multimeter red lead to disconnected circuit 27 wire.
h.
Connect multimeter 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 COOLANT TEMPERATURE 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
0106
0106-5
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