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 287 of 1417
DC VOLTAGE TEST - Continued
STEP
1.
Perform offset test.
a.
Attached P1 of test probe cable W2 to J4 on VTM.
T0012DAA
J1 DCA/PWR
TEST PROBE
CABLE
W2
BLACK
RED
P1
THIS DISPLAY INDICATES VOLTAGE
MEASURED IS GREATER THAN 45
VOLTS
IF TESTING A POSITIVE (+)
VOLTAGE, NEGATIVE (-) DISPLAY
INDICATES TEST LEADS ARE
REVERSED. REVERSE LEADS FOR
(+) READING.
J4
VOLTS/OHMS
CONNECT TO
VOLTAGE
TEST POINT
CONNECT TO
GROUND
Figure 1.
STE/ICE Test.
b.
Short red and black clip leads of the cable together.
c.
Dial 89 into TEST SELECT.
Table
1.
Voltage Test.
TEST NO.
TEST
89
0-45 Volts DC
27
Fuel Solenoid Voltage
82
Alt/Gen Output Voltage
84
Alt/Gen Negative Cable Voltage Drop
d.
Press and hold TEST in until message CAL appears on display.
TM 9-2320-272-23-2
0196
0196-2
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