Troubleshooting

Table 82
Troubleshooting Test Steps
Values Results
1. Inspect Electrical Connectors and Wiring
A. Thoroughly inspect connectors for the motorized valves.
Refer to Troubleshooting, “Electrical Connectors - Inspect” for
details.
B. Thoroughly inspect the P2/J2 ECM connector. Refer to
Troubleshooting, “Electrical Connectors - Inspect” for details.
C. Perform a 30 N (6.7 lb) pull test on each of the wires that
are associated with the motorized valves.
Damaged wire
or connector
Result: A damaged wire or damaged connector was found.
Repair the damaged wire or the damaged connector.
Use the electronic service tool to clear all logged diagnostic co-
des. Verify that the repair eliminates the fault.
Result: All connectors, pins, and sockets are correctly con-
nected and/or inserted and the harness is free of corrosion, of
abrasion or of pinch points.
Proceed to Test Step 2.
2. Check for Diagnostic Codes
A. Turn the keyswitch to the OFF position.
B. Connect the electronic service tool to the diagnostic
connector.
C. Turn the keyswitch to the ON position.
D. Monitor the electronic service tool for active diagnostic co-
des and/or logged diagnostic codes.
Diagnostic
codes
Result: An XXXX-7 diagnostic code is active or recently
logged for one or more of the motorized valves
Proceed to Test Step 3.
Result: An XXXX-5 diagnostic code is active or recently
logged for one or more of the motorized valves.
Proceed to Test Step 4.
Result: An XXXX-6 diagnostic code is active or recently
logged for one or more of the motorized valves.
Proceed to Test Step 6.
3. Measure the Sensor Supply Voltage at the Valve
Connector
A. Turn the keyswitch to the OFF position.
B. Disconnect the suspect valve from the engine harness.
C. Turn the keyswitch to the ON position.
D. Measure the voltage at the harness connector for the valve
from the 5 VDC supply terminal of the position sensor to the
sensor ground terminal.
4.9 v to 5.1 V Result: The measured voltage is within the expected range.
Install a replacement for the suspect valve. Refer to Disassem-
bly and Assembly for more information.
Note: If the NRS valve is replaced, use the electronic service
tool to perform the “EGR Valve Learn Reset” .
Use the electronic service tool in order to clear all logged diag-
nostic codes and then verify that the repair eliminates the fault.
Result: The measured voltage is not within the expected
range.
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 suspect wiring.
Use the electronic service tool to clear all logged diagnostic co-
des and verify that the repair eliminates the fault.
(continued)
166 UENR0612-07
Circuit Tests
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