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
NOTE - This chart is only to be used if:
1)
All basic mechanical checks and physical inspections have been performed with no problem found, and
2)
Diagnosis of DDEC-III was started at step Start-1, pg 3-345.41 and you have now been referred here.
C 11-1
Identify Type of VSG
Does DDEC system have cruise
control switch VSG?
YES
Go to C11-2.
NO
Go to C11-5.
C 11-2
Check Calibration
for Cruise Control
VSG
Turn ignition on.
YES to all.
Go to C11-3.
Plug DDR into DDL
connector.
NO to any.
You do not have proper
Select calibration configuration.
calibration for your application.
Does DDEC system have vehicle
This option was not specified at
speed sensor and is it enabled.
time the engine was ordered.
Is cruise control enabled?
Refer to DDR Instruction
Is correct PTO initial speed
Manual, CALIBRA TION
programmed?
CHANGES for information
on enabling correct options.
C 11-3
Check Cruise Control
Is Cruise Control working correctly?
YES.
Go to C11-4.
On DDR select VEHICLE
SWITCHES LIGHT STATUS.
NO.
Fix cruise control problem first.
Does DDR display respond
Go to Chart 12, page 3-345.27.
correctly when cruise SET and
brake switch is enabled for
PTO?
C 11-4
Check Cruise Control
VSG
On DDR select vehicle speed on
YES.
Problem no longer exists. Go to
engine data list. Make sure
C1-2 for more information (page
that speed Is less than 5 MPH.
3-345.61).
Select PTO RPM Set. Does
display show correct RPM when
NO.
Go to C11-8.
cruise set switch Is pressed?
Change 3 3-345.117
