(Table 82, contd)
Troubleshooting Test Steps
Values
Results
4. Create a Short Circuit at the Valve Connector
A. Turn the keyswitch to the OFF position.
B. Disconnect the connector for the suspect valve.
C. Fabricate a jumper wire that is 150 mm (6 inch) long.
D. Install the jumper between the PWM signal and return pins
on the connector for the suspect valve in order to create a
short circuit.
E. Turn the keyswitch to the ON position. Check for active di-
agnostic codes on the electronic service tool.
F. Remove the jumper wire.
Diagnostic
codes
Result:
An XXXX-6 is active with the jumper installed.
Reconnect the valve. Start the engine.
Check for active diagnostic codes on the electronic service tool.
Wait at least 30 seconds in order for the codes to be displayed.
If the XXXX-5 diagnostic code returns, then replace the valve.
Refer to Disassembly and Assembly for the correct procedure.
Note:
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 XXXX-5 diagnostic code is still active with the jump-
er installed.
Proceed to Test Step 5.
5. 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. Install
the jumper wire between the PWM supply wire and the return
wire for the suspect valve on the J2 connector.
D. Turn the keyswitch to the ON position. Wait at least 30 sec-
onds for activation of the diagnostic codes.
Note:
Diagnostic codes for all of the engine sensors will be ac-
tive with the P2 connector disconnected. Ignore all other co-
des and only look for codes that relate to the suspect valve.
E. Look for an active XXXX-6 diagnostic code for the suspect
valve.
F. Turn the keyswitch to the OFF position.
Diagnostic
codes
Result:
An XXXX-6 diagnostic code was active with the jumper
installed.
The fault is in the wiring between the suspect valve and the
ECM P2 connector.
Check all of the wiring between the suspect valve and the P2
connector. Refer to the Electrical Schematic for the engine.
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:
An XXXX-5 diagnostic code is still active with the jump-
er installed.
Proceed to Test Step 8.
6. Create an Open Circuit at the Valve Connector
A. Turn the keyswitch to the OFF position.
B. Disconnect the connector for the suspect valve in order to
create an open circuit.
C. Turn the keyswitch to the ON position. Check for active di-
agnostic codes on the electronic service tool. Wait at least 30
seconds in order for the codes to be displayed.
Diagnostic
Codes
Result:
An XXXX-5 diagnostic code is active with the valve
disconnected.
Reconnect the valve. Start the engine.
Check for active diagnostic codes on the electronic service tool.
Wait at least 30 seconds in order for the codes to be displayed.
If the XXXX-5 diagnostic code returns, then replace the valve.
Refer to Disassembly and Assembly for the correct procedure.
Note:
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 XXXX-6 diagnostic code is still active with the valve
disconnected.
Proceed to Test Step 7.
(continued)
162
UENR0612
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