(Table 236, contd)
Troubleshooting Test Steps
Values Results
6. Check the Harness for a Short Circuit
A. Turn the keyswitch to the OFF position.
B. Disconnect the P2 ECM connector and the connector for
the suspect valve.
C. For a suspect NRS valve position sensor, measure the re-
sistance between P2:38 and all other terminals on P2.
D. For a suspect EBPR position sensor, measure the resist-
ance between P2:30 and all other terminals on P2.
E. Install the removed connectors.
Greater than 100
Ohms
Result: The measured resistance is less than 100
Ohms. There is a short circuit in the harness.
Repair: Repair the valve connector or replace the
harness.
Use the electronic service tool to clear all logged diag-
nostic codes and verify that the repair eliminates the
fault.
Result: The measured resistance is greater than 100
Ohms.
Contact the Dealer Solutions Network (DSN).
7. Create a Short Circuit at the Valve Connector
A. Turn the keyswitch to the OFF position.
B. Disconnect the connector for the valve with the XXXX-3 di-
agnostic code.
C. Fabricate a jumper wire that is 150 mm (6 inch) long.
D. Insert one end of the jumper wire into terminal 3 on the har-
ness connector for the suspect valve. Insert the other end of
the jumper into terminal 2.
E. Turn the keyswitch to the ON position.
F. Access the “Active Diagnostic Codes” screen on the elec-
tronic service tool and check for an active XXXX-4 diagnostic
code for the suspect sensor.
G. Remove the jumper.
Less than two Ohms Result: An XXXX-3 diagnostic code was active before
the jumper was installed. An XXXX-4 diagnostic code is
active when the jumper is installed.
Repair: Reconnect the connector for the suspect valve.
Turn the keyswitch to the ON position. Use the electronic
service tool to check for active diagnostic codes. If the
XXXX-3 diagnostic code returns, there is an open circuit
in the valve. Install a replacement valve. Refer to Disas-
sembly and Assembly for the correct procedure.
Use the electronic service tool to clear all logged diag-
nostic codes and verify that the repair eliminates the
fault.
Result: An XXXX-3 diagnostic code remains active
when the jumper is installed. The valve is OK.
Proceed to Test Step 8.
8. Check the Wiring Harness for an Open Circuit
A. Turn the keyswitch to the OFF position.
B. Disconnect the P2 ECM connector and the connector for
the suspect valve.
C. For a suspect NRS valve, check the resistance between
terminal 3 on the valve connector and P2:38.
D. For a suspect exhaust back pressure regulator, check the
resistance between terminal 3 on the valve connector and
P2:30.
E. Install the removed connectors.
Less than two Ohms Result: The measured resistance is greater than two
Ohms. There is an open circuit in the harness.
Repair: Repair the valve connector or replace the
harness.
Use the electronic service tool to clear all logged diag-
nostic codes and verify that the repair eliminates the
fault.
Result: The measured resistance is less than two
Ohms.
Contact the Dealer Solutions Network (DSN).
UENR4469-36 449
Circuit Tests
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