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TM9-2320-360-20-3
Section 4
TROUBLESHOOTING CHARTS
D. CHART -10 - VARIABLE SPEED GOVERNOR (VSG OR PTO HIGH IDLE) INOPERATlVE (Cont’d)
STEP/SEQUENCE
C 10-11
Check for Short
Between Signal and
Ground
l Remove jumper wire.
l Read resistance between sockets
D1 (#510) and C3 (#952) on vehicle
harness connector.
l Also read resistance between
socket D1 (#510) and a good
ground.
C 10-12
Check for Short
Between +5 Volt
Line and Ground
l Disconnect vernier
control connector.
l Read resistance between sockets
A3 (#916) and C3 (#952) on
vehicle harness connector.
l Also read resistance between
socket A3 (#916) and a good
ground.
C 10-13 Check Vernier
Control Connectors
l Inspect terminals at vernier control
connectors (sensor side and
harness side) for damaged; bent,
corroded, and unseated pins or
sockets.
Both readings
are greater than
10,000 ohms or open.
Either reading is
less than equal
to 10,000 ohms.
Both readings
are greater than
10,000 ohms or open.
Either reading is
less than or equal
to 10,000 ohms.
Terminals and
Replace vernier control
connectors are okay.
(para 7-76). Then go to C 10-30.
Problem found.
WHAT TO DO NEXT
Go to C 10-12.
Signal line (ckt #525 or
#510) or neutral interlock
switch is shorted to ground (either
ckt #952 or chassis ground).
Repair short. Then go to C10-30.
Go to C 10-13.
The +5 volt line (ckt #916) is
shorted to ground (either ckt
#952 or chassis ground). Repair
short. Then to to Cl O-30.
Repair terminals/connectors
(para 7-77). Then go to C 10-30.
H-99
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