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 11-8
Check ECM
Connectors
Turn ignition off.
Terminals and
Reprogram ECM. Then go
Disconnect vehicle harness
connectors are okay.
to C11-30.
connector at ECM.
Check terminals at vehicle
harness connector (both ECM
Problem found
Repair terminals/connectors.
and harness side) for damage;
Then go to C11-30.
bent, corroded, and unseated
pins or sockets.
C 11-9
Check for Open
Turn ignition off.
Greater than
Signal line (ckt #535 or #510).
Make sure vehicle is In neutral/
5 ohms or open.
ground line (ckt #952) or the
park.
Neutral interlock switch has an
Disconnect vehicle harness
open. Repair open. Then go to
connector at ECM.
C11-30.
Also disconnect speed
adjustment sensor connector.
Install a jumper wire between pins
Less than or
Go to C11-10.
A and B of the speed adjustment
equal to 5 ohms
sensor harness connector.
Read resistance between sockets
D (#510) and C3 (#952) on
vehicle harness connector.
C 11-10
Check for +5 Volt
Line Open
Move jumper so that it is now
Greater than
The +5 Volt line (ckt #916)
between pins C and A of PTOSA
5 ohms or open.
is open. Repair open. Then go
sensor harness connector.
to C 11-30.
Read resistance between sockets
A3 (#916) and C3 (#952) on
Less than or
Go to C11-11.
vehicle harness connector.
equal to 5 ohms.
Change 3 3-345.121
