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TM9-2320-360-20-3
Section 4
TROUBLESHOOTING CHARTS
D. CHART -10 - VARIABLE SPEED GOVERNOR (VSG OR PTO HIGH IDLE) 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 H-25 and you have now been referred here.
STEP/SEQUENCE
C 10-1 through C 10-4 (Deleted)
C 10-5
Check Throttle
Position Sensor
l Turn ignition on.
l Plug DDR into DDL
connector.
l Engine at no throttle
l Read TPS PCT
using DDR.
C 10-6
Check If ECM Is
Reading VSG Speed
l Start engine (TM 9-2320-360-10).
l Position transmission range
selector to N (neutral).
l Select the PTO RPM on the
DDR reader.
l Position left ENGINE SPEED
CONTROL switch to HIGH
ENGINE IDLE and press PUSH
TO LOCK ENGINE @ HIGH IDLE
switch. Note reading on DDR.
l Shut off engine
(TM9-2320-360-10).
C 10-7
Verify Complaint
l Start engine (TM9-2320-360-10)
and run at idle.
l Using the DDR reader, make sure
that TPS PCT is 0.
l Position left ENGINE SPEED
CONTROL switch to HIGH
ENGINE IDLE and press PUSH
TO LOCK ENGINE @ HIGH IDLE
switch. Note reading on DDR and
tachograph.
At 0% throttle.
Greater than 0%
throttle.
DDR display
changes smoothly
from idle (typically
600 RPM) to
high idle speed
(1500 RPM).
D D R d o e s n o t
change at all or does
not change smoothly.
RPM Is increasing.
RPM does not increase.
WHAT TO DO NEXT
Go to C 10-6.
Check throttle position sensor
adjustment. Go to 21-4
(page H-139).
Go to C 10-7.
Go to C 10-9.
Problem no longer exists. Go to
C 1-2 for more information (page
H - 4 1 ).
Go to C 10-8.
H-95
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