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TM 9-2320-312-24-2
Troubleshooting Section
No The problem is in the vehicle wiring between
F. Alternately remove the jumper wire and then
insert the jumper wire at the switch terminals. At
the bulkhead connector and the ECM. Inspect
the same time, watch the status screen on ET.
the vehicle wiring and then repair the vehicle
wiring. Otherwise, send the vehicle to the OEM
dealer for repair. Verify that the original condition
Expected Result:
is resolved. STOP.
The status of the switch changes to "ON" with
the jumper wire in place. The status of the switch
i01674427
changes to "OFF" when the jumper wire is removed.
PTO Shutdown Timer - Test
Results:
SMCS Code: 1900-038
Yes
System Operation Description:
Repair: Replace the switch.
Use this procedure under the following situation:
Verify that the repair eliminates the problem.
Use this procedure to determine if the PTO
STOP.
Shutdown is operating correctly.
No There is a problem in the wire harness
The following background information is related
between the switch and the ECM. Proceed to Test
to this procedure:
Step 5.
PTO Shutdown Timer
Test Step 5. Insert a Jumper Wire at the
Bulkhead Connector.
A programmable parameter for the PTO Shutdown
Timer is provided. This timer will shut down the
A. Turn the ignition key switch to the OFF position.
engine when all of the following conditions are met:
B. Fabricate a jumper wire 100 mm (4 inch) long.
The PTO shutdown time that is programmed has
Crimp a Deutsch pin to both ends of the wire.
expired.
C. Locate the suspect terminal on the engine side
The ECM is programmed to use "Dedicated PTO"
of the bulkhead connector.
parameters.
D. Insert the wire jumper pin between the switch
The PTO on/off switch is ON and the ECM is in
socket and the sensor common connection.
the dedicated PTO mode.
Install the jumper wire on the engine side of the
bulkhead connector.
The engine is not in the Cold Mode.
E. Turn the ignition key switch to the ON position.
During the last 90 seconds of the PTO Shutdown
Timer, the check engine lamp will begin flashing. If
F. Alternately connect and then disconnect the
the vehicle is equipped with a PTO switch on lamp,
jumper wire. At the same time, monitor the status
the PTO switch on lamp will begin flashing during
screen on ET.
the last 90 seconds.
Expected Result:
If the PTO shutdown timer is activated and the timer
stops the engine, the following event code will be
The status of the switch changes from "ON" with
generated.
the jumper wire in place. The status of the switch
changes to "OFF" when the jumper wire is removed.
71-14 PTO Shutdown Timer Occurrence (47)
Results:
Note: Fuel rates are not monitored while the PTO
shutdown timer is active. Shutdown will occur
Yes The problem is in the vehicle wiring
regardless of load. Unlike the idle shutdown timer,
between the bulkhead connector and the switch.
the PTO shutdown timer cannot be overridden by
Inspect the vehicle wiring and then repair the
using the clutch pedal or the brake pedal.
vehicle wiring. Otherwise, send the vehicle to
the OEM dealer for repair. Verify that the original
Test Step 1. Verify Activation of the PTO
condition is resolved. STOP.
Shutdown Timer
A. Connect Caterpillar Electronic Technician (Cat
ET) to the cab data link connector.

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