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 390 of 1313

ENGINE CRANKS BUT WILL NOT START IN COLD WEATHER (FUEL SYSTEM OPERATING PROPERLY) -

Continued

c.

Connect red lead to circuit 570 terminal on fuel pressure switch.

d.

Connect black lead to good ground.

e.

Multimeter will display volts DC.

f.

Crank engine and depress ether start switch.

NOTE

If battery voltage is present, circuit 570 wire is faulty.

g.

Meter reading should be greater than 18 VDC.

CONDITION/INDICATION

DOES CIRCUIT 570 WIRE CONDUCT BATTERY VOLTAGE TO ETHER VALVE?

DECISION

YES - Go to Step (4).

NO - Repair circuit 570 wire to ether valve (Volume 3, WP

0352). Go to Step (10) to verify problem is solved.

TM 9-2320-272-23-1

0021

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