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Page Title:
FAN SPEED DOES NOT DECREASE FROM HIGH TO LOW SPEED. (Cont) |
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 TM 9-2320-364-34-1
5. FAN DOES NOT DECREASE FROM HIGH TO LOW SPEED (CONT).
2.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Voltage test.
Unit Troubleshooting
on Page 2-217
STE/ICE-R #89.
tasks completed.
22 to 28 vdc to high speed fan
REASON FOR QUESTION
lockout solenoid valve is
Do EPAC voltage outputs and
present.
If EPAC controller is not sending
High speed fan lockout solenoid
engine temperatures agree
correct voltage to fan control
valve OK.
with the values listed on
solenoid valve, valve will not
High speed fan lockout
actuate and fan will not slow
differential pressure sensing
down.
valve OK.
POSSIBLE PROBLEMS
EPAC controller faulty.
Adjust or replace
Fan control solenoid
EPAC controller
valve faulty.
(Para 6-12).
NO
Verify repair, go to
Step 5 of this Fault.
YES
Replace fan control
solenoid valve
(TM 9-2320-364-
20-3). Verify repair,
go to Step 5 of
this Fault.
2-216
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