STEP/SEQUENCE
RESULT
WHAT TO DO NEXT
TM 9-2320-363-20-1
Section 4
TROUBLESHOOTING CHARTS
D. CHART - 11 - VARIABLE SPEED GOVERNOR (VSG OR PTO) INOPERATIVE (Cont'd)
C 11-5
Check Throttle
Position Sensor
Turn ignition on.
At 0% throttle.
Go to C11-6.
Plug DDR into DDL
connector.
Greater than 0%
Check throttle position sensor
Engine at no throttle
throttle.
adjustment. Go to 21-4 (page
Read THROTTLE %
3-345.231)
using DDR.
C 11-6
Check if ECM is
Reading VSG Speed
Adjust Sensor
Turn ignition on (engine not
DDR display
Go to C11-7.
running).
changes smoothly
Select VSG RPM on
from idle (typically
DDR.
600 RPM) to at least
Turn PTOSA sensor from fully
top speed of speed
closed to fully open while
speed adjustment sensor.
observing DDR Reader display.
DDR Reader does not
Go to C11-9.
change at all or does
not change smoothly.
C 11-7
Verify Complaint
Turn speed adjustment sensor
RPM is increasing.
Problem no longer exists. Go to
down (counter-clockwire).
C1-2 for more information (page
Start and run engine at idle.
3-345.61).
Using DDR Reader make sure
that the vehicle speed is less
RPM does not.
Go to C11-8.
than 5 MPH and % throttle is 0.
Slowly turn speed adjust
sensor up (clockwise).
Change 3 3-345.119
