Troubleshooting

(Table 115, contd)
Troubleshooting Test Steps
Values Results
5. Create an Open Circuit at the Valve Connector
A. Turn the keyswitch to the OFF position.
B. Disconnect the connector for the valve with the XX-4 diag-
nostic code.
C. Turn the keyswitch to the ON position. Wait for at least 10
seconds for activation of the diagnostic codes.
D. Use the electronic service tool to check the “Active Diag-
nostic Code” screen. Check for an XX-3 diagnostic code.
Note: Diagnostic codes for all of the engine sensors will be
active with the P2 connector disconnected. Ignore all other
codes and only look for codes that relate to the suspect valve.
E. Turn the keyswitch to the OFF position.
Diagnostic
codes
Result: An XX-3 diagnostic code is active with the valve
disconnected.
Reconnect the connector for the valve.
If the XX-4 diagnostic code returns, there is a short in the
valve.
Install a replacement valve. Refer to Disassembly and Assem-
bly for the correct procedure.
If the NRS valve is replaced, use the electronic service tool to
perform the “EGR Valve Learn Reset” .
Use the electronic service tool to clear all logged diagnostic co-
des and verify that the repair eliminates the fault.
Result: There is still an XX-4 diagnostic code active with the
valve disconnected.
Proceed to Test Step 6.
6. Create an Open Circuit at the ECM Connector
A. Turn the keyswitch to the OFF position.
B. Disconnect the P2 connector from the ECM.
C. Turn the keyswitch to the ON position. Wait at least 10 sec-
onds for activation of the diagnostic codes.
D. Use the electronic service tool in order to monitor the “Ac-
tive Diagnostic Code” screen. Check for an XX-3 diagnostic
code for the suspect sensor.
Note: Diagnostic codes for all of the engine sensors will be
active with the P2 connector disconnected. Ignore all other
codes and only look for codes that relate to the suspect
sensor.
Diagnostic
Codes
Result: An XX-3 diagnostic code is active with the P2 connec-
tor disconnected.
The fault is in the wiring for the suspect sensor between the
suspect valve connector and the P2 connector.
Check all wiring between the suspect valve and the ECM. Re-
fer to the appropriate Electrical Schematic.
Replace the faulty wiring.
Use the electronic service tool in order to clear all logged diag-
nostic codes and then verify that the repair eliminates the fault.
Result: An XX-4 diagnostic code is still active with the P2 con-
nector disconnected.
Proceed to Test Step 9.
(continued)
UENR0612-07 249
Circuit Tests
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