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 446 of 1313
ENGINE OVERHEATS - Continued
STEP
11.
IS TEMPERATURE GAUGE OPERATING PROPERLY?
a.
Shut off engine.
b.
Remove connector from temperature sending unit on the vehicle.
c.
Turn vehicle battery switch to ON position.
d.
Connect multimeter red lead to connector removed from the temperature sending unit. Refer to point to
point schematic.
e.
Connect multimeter black lead to a good ground.
T1006DAA
Test Probe
Cable W2
Red
Black
Connector Removed From
Temperature Sending Unit
Figure 13.
Test Lead Hookup.
NOTE
If meter displays a reading between 5.5 and 7.5 VDC, temperature gauge is operating
correctly.
f.
Meter should display a reading between 5.5 and 7.5 VDC.
CONDITION/INDICATION
IS TEMPERATURE GAUGE OPERATING PROPERLY?
DECISION
YES - Replace temperature sending unit (Volume 2, WP
0334). Go to Step (11) to verify problem is solved.
NO - Perform Temperature Gauge Inoperative (Coolant) troubleshooting (WP
0106).
TM 9-2320-272-23-1
0028
0028-15
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