Troubleshooting

(Table 115, contd)
Troubleshooting Test Steps
Values Results
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 XX-3 diag-
nostic code.
C. Fabricate a jumper wire that is 150 mm (6 inch) long.
D. Insert one end of the jumper wire into the terminal for the
valve position sensor signal on the harness connector for the
suspect valve. Insert the other end of the jumper into the ter-
minal for the sensor ground on the harness connector for the
suspect valve.
E. Turn the keyswitch to the ON position. Wait at least 10 sec-
onds for activation of the diagnostic codes.
F. Access the “Active Diagnostic Codes” screen on the elec-
tronic service tool and check for an active XX-4 diagnostic
code for the suspect sensor.
G. Remove the jumper.
Diagnostic
codes
Result: An XX-4 diagnostic code is active when the jumper is
installed.
Reconnect the connector for the suspect valve.
Turn the keyswitch to the ON position. Use the electronic serv-
ice tool to check for active diagnostic codes.
If the XX-3 diagnostic code returns, there is an open circuit 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: An XX-3 diagnostic code remains active when the
jumper is installed.
Proceed to Test Step 8.
8. Create a Short Circuit at the ECM Connector
A. Turn the keyswitch to the OFF position.
B. Disconnect the P2 connector from the ECM.
C. Fabricate a jumper wire that is 150 mm (6 inch) long. In-
stall the jumper between the suspect sensor signal pin and
the sensor ground pin on the J2 connector.
D. Turn the keyswitch to the ON position. Do not attempt to
start the engine. Wait at least 10 seconds for activation of the
diagnostic codes.
E. Use the electronic service tool to check for an active XX-4
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.
F. Turn the keyswitch to the OFF position. Remove the jumper
wire.
Diagnostic
codes
Result: An XX-4 diagnostic code is active with the jumper wire
installed.
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 to clear all logged diagnostic co-
des and verify that the repair eliminates the fault.
Result: The XX-3 diagnostic code is still active with the jumper
wire installed.
Proceed to Test Step 9.
9. Check if a Replacement ECM Eliminates the Fault
A. Contact the Dealer Solution Network (DSN).
B. If the DSN recommends the use of a replacement ECM, in-
stall a replacement ECM. Refer to Troubleshooting, “Replac-
ing the ECM”.
Diagnostic
codes
Result: There are no active diagnostic codes with the replace-
ment ECM.
Reconnect the suspect ECM. If the fault returns with the sus-
pect ECM, replace the ECM.
Use the electronic service tool in order to clear all logged diag-
nostic codes and then verify that the repair eliminates the fault.
(continued)
250 UENR0612-07
Circuit Tests
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