(Table 86, contd)
Troubleshooting Test Steps
Values
Results
6. Create at Short Circuit at the Switch
A. Turn the keyswitch to the OFF position.
B. Disconnect the connector for the suspect switch.
C. Fabricate a jumper wire and install the jumper wire between the
two terminals for the switch.
D. Turn the keyswitch to the ON position.
E. Monitor the status screen on the electronic service tool while
the jumper wire is being disconnected and reconnected.
Switch status
Result:
When the jumper wire is connected, the
status of the suspect PTO switch is
“
CLOSED
”
.
When the jumper wire is disconnected, the status
of the suspect PTO switch is
“
OPEN
”
.
Replace the switch.
Use the electronic service tool in order to clear all
logged diagnostic codes and then verify that the
repair has eliminated the problem.
Result:
When the jumper wire is disconnected,
the status of the suspect PTO switch is
“
CLOSED
”
.
Reconnect the switch and proceed to Test Step 7.
Result:
When the jumper wire is connected, the
status of the suspect PTO switch is
“
OPEN
”
.
Proceed to Test Step 8.
7. Check the Switch Return Wire for a Short Circuit
A. Turn the keyswitch to the OFF position.
B. Disconnect the connector for the suspect switch. Disconnect
the P1 connector from the ECM.
C. Use a suitable multimeter to measure the resistance between
the terminal for the suspect switch on the P1 connector and all oth-
er terminals on the P1 connector.
Greater than 1 k Ohm
Result:
At least one of the resistance measure-
ments is less than 1 k Ohm.
There is a short in the wiring between the suspect
switch and the P1 ECM connector.
Check all wiring between the suspect switch and
the ECM. Refer to the Electrical Schematic for the
application.
Replace the faulty wiring.
Use the electronic service tool to clear all logged
diagnostic codes and verify that the repair elimi-
nates the fault.
Result:
All resistance measurements are greater
than 1 k Ohm.
Contact the Dealer Solution Network (DSN).
8. Measure the Resistance of the Switch Return Wire to the
ECM
A. Disconnect the P1 connector from the ECM.
B. Thoroughly inspect the J1/P1 connectors on the ECM. Refer to
Troubleshooting, “Electrical Connectors - Inspect” for details.
C. Measure the resistance between the appropriate pin on the P1
connector for the suspect switch and the wire to the suspect
switch. Refer to Illustration 43 .
Less than 5 Ohms
Result:
The measured resistance is greater than
5 Ohms.
The fault is in the wiring between the suspect
switch and the P1 connector.
Check all wiring between the suspect switch and
the P1 connector. Refer to the Electrical Sche-
matic for the application.
Replace the faulty wiring.
Use the electronic service tool in order to clear all
logged diagnostic codes and then verify that the
repair has eliminated the fault.
Result:
The measured resistance is less than 5
Ohms.
Contact the Dealer Solution Network (DSN).
Complete the procedure in the order in which the
steps are listed.
If the procedure did not correct the issue, Contact the
Dealer Solution Network (DSN).
UENR0612
173
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