Troubleshooting

(Table 86, contd)
Troubleshooting Test Steps
Values Results
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
other 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.
Repair: Check all wiring between the suspect
switch and the ECM. Refer to the Electrical Sche-
matic 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.
Repair: Check all wiring between the suspect
switch and the P1 connector. Refer to the Electri-
cal Schematic 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).
i06230630
Relay - Test
(Start Relay)
This procedure covers the following diagnostic code:
Table 87
Diagnostic Trouble Codes for the Starting Motor Relay
J1939 Code Description Notes
(continued)
UENR0612-07 179
Circuit Tests
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