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Page Title:
TACHOMETER DOES NOT OPERATE OR IS INACCURATE (CONT) |
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 TM 9-2320-366-20-1
e14. TACHOMETER DOES NOT OPERATE OR IS INACCURATE (CONT)
KNOWN INFO
TEST OPTIONS
2.
Visual Inspection
Tachometer illuminates.
REASON FOR QUESTION
VOLTS gage OK.
Is engine speed sensor free
A damaged engine speed
Engine speed sensor OK
from damage?
sensor will cause
electrically.
tachometer to malfunction.
POSSIBLE PROBLEMS
Faulty engine speed sensor.
Faulty dashboard cable
NO
assembly.
Faulty auxiliary panel cable
assembly.
Faulty engine control cable
assembly.
Replace engine speed sensor
YES
Faulty tachometer.
(para 7-46).
KNOWN INFO
TEST OPTIONS
3.
STE/ICE-R Test #10
Tachometer illuminates.
REASON FOR QUESTION
VOLTS gage OK.
Does tachometer operate
This question eliminates
Engine speed sensor OK.
correctly after performing
possible problems and
step 2?
determines where
POSSIBLE PROBLEMS
troubleshooting continues.
Faulty dashboard cable
assembly.
Faulty auxiliary panel cable
assembly.
NO
Faulty engine control cable
assembly.
Faulty tachometer.
YES
Go to step 4 of this fault.
Fault corrected.
2-360
Change 1
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