TM-9-2320-387-24-1

TRUCK, UTILITY: S250 SHELTER CARRIER, 4X4, M1113

TECHNICAL MANUAL; UNIT, DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE, VOLUME 1

DECEMBER 1997

CHANGE 1

TM-9-2320-387-24-1 - Page 233 of 1205

TM 9-2320-387-24-l

I

DIAGNOSTIC

FLOWCHART

ENGINE

COOLING

FAN ENGAGES

CONTROL VALVE OK

r OPTIONS

1.

STUICE-R

TEST 91 (Page 2-508)

!. MULTIMETER

REASON

FOR QUESTION

Wire 93 provides the time-delay

module’s connection

to ground.

IS THERE CONTINUITY FROM

WIRE 936 IN THE 4-WAY

CONNECTOR TO ENGINE

GROUND?

I

POSSIBLE

PROBLEMS

WIRING

r

KNOWN INFO

. OPTIONS

1. STE/ICE-R TEST 91 (Page 2-508)

2. MULTIMETER

FAN ENGAGES

CONTROL VALVE OK

IS THERE CONTINUITY OF

ENGINE WIRING HARNESS

WIRE 315B BETWEEN THE

TIME-DELAY

MODULE AND THE

FAN CUT-OFF SWITCH?

REASO’d FOR QUESTION

POSSIBLE

PROBLEMS

The fan cut-off switch has some

control of the engine fan.

WIRING

I

2. MULTIMETER

KNOWN INFO

FAN

ENGAGES

CONTROL

VALVE OK

IS THERE ABOUT ZERO VOLTAGE

ON THE TIMER END OF WIRE 4586

WITH WIRE 458A DISCONNECTED

FROM THE FAN TEMPERATURE

SWITCH?

REASON

FOR QUESTION

If wire 4588 is shorted to some

other live wire, the fan will not

engage.

POSSIBLE

PROBLEMS

WIRING

REPAIR/REPLACE

OR HARNESS.

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