(Table 113, 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 ac-
tive with the P2 connector disconnected. Ignore all other co-
des 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 ac-
tive with the P2 connector disconnected. Ignore all other co-
des 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. Refer
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.
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 termi-
nal 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.
(continued)
UENR0612
233
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