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
modules 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?
REASOd 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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