Test Step 5. Insert a Jumper Wire at the Bulkhead Connector

349

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.