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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 (Cont’d)
STEP/SEQUENCE
C 10-8
Check ECM
Connectors
l Turn ignition off.
l Disconnect vehicle harness
connector at ECM.
l Check terminals at vehicle
harness connector (both ECM
and harness side) for damage;
bent, corroded, and unseated
pins or sockets.
C 10-9
Check for Open
l Turn ignition off.
l Make sure vehicle is in neutral.
l Disconnect vehicle harness
connector at ECM.
l Also disconnect vernier control
connector.
l Install a jumper wire between pins
A and B of the vernier control
connector.
l Read resistance between sockets
D1 (#510) and C3 (#952) on
vehicle harness connector.
C 10-10
Check for +5 Volt
Line Open
l Move jumper so that it is now
between pins C and A of vernier
control connector.
l Read resistance between sockets
A3 (#916) and C3 (#952) on
vehicle harness connector.
RESULT
Terminals and
connectors are okay.
Problem found.
Greater than
5 ohms or open.
Less than or
equal to 5 ohms.
Greater than
5 ohms or open.
Less than or
equal to 5 ohms.
WHAT TO DO NEXT
Replace ECM (para 7-29.1).
Then go to C10-30.
Repair terminals/connectors
(para 7-77). Then go to C10-30.
Signal line (ckt #525 or #510).
ground line (ckt #952) or the
Neutral interlock switch has an
open. Repair open. Then go to
C 10-30.
Go to C 10-10.
The +5 volt line (ckt #916)
is open. Repair open. Then go
to C10-30.
Go to C 10-11.
H-97
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