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 302 of 1417

NG31: GAUGE TEST - Continued

STEP

2.

Perform voltage test.

a.

Remove wire from temperature sending unit on vehicle.

b.

Connect red clip lead of W2 to wire removed from sending unit.

c.

Connect black clip lead to a good ground.

d.

Turn vehicle accessory switch ON.

CONDITION/INDICATION

Does VTM indicate battery voltage?

DECISION

YES - Replace temperature sending unit (WP

0334). After completing repair, rerun GO-Chain tests to verify

problem is solved and no other problem exists.

NO - Perform Temperature Gauge Inoperative (Coolant) troubleshooting (Volume 1, WP

0106).

END OF WORK PACKAGE

TM 9-2320-272-23-2

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