TM 9-2320-387-24-l
ENGINE COOLING
DIAGNOSTIC FLOWCHART
-
KNOWN INFO
T OPTIONS
TRY IT.
FAN DRIVE OK
FAN DOESN’T ENGAGE
VIA 458
DISCONNECT THE CONTROL
VALVE ELECTRICAL
CONNECTOR AT THE TIME-DELAY
MODULE. DOES THE FAN
ENGAGE?
POSSIBLE
PROBLEMS
REASON FOR QUESTION
With no power to the solenoid,
the fan should engage.
FAN WIRING
TIME-DELAY
MODULE
FAN CONTROL VALVE
PCB
REPLACE CONTROL
I
r OPTIONS
KNOWN INFO
DISCONNECT THE 4-WIRE
CONNECTOR AT THE TIME-DELAY
MODULE. IS THERE CONTINUITY
FROM 4588 AT THE 4-WIRE
HARNESS TO 458B AT THE
FAN TEMPERATURE SWITCH?
1. STE/ICE-R TEST 91 (Page 2-508)
2. MULTIMETER
REASON FOR QUESTION
Wire 4566 connects the switch
and the timer.
FAN ENGAGES
CONTROL VALVE OK
POSSIBLE
PROBLEMS
WIRING
REPAIR/REPLACE
7
1 STE/ICE-R TEST a9 (Page 2-506)
2. MULTIMETER
KNOWN INFO
WITH THE ROTARY SWITCH IN
RUN, IS THERE BATTERY
VOLTAGE AT WIRE 5838
IN THE TIME-DELAY
MODULE 4 WIRE CONNECTOR?
FAN ENGAGES
CONTROL VALVE OK
REASON FOR QUESTION
Wire 5638 connects battery
voltage to the delay module.
POSSIBLE
PROBLEMS
WIRING
REPAIWREPLACE
