EGR Airflow Control Valve Circuit Open

2529-EGR AIRFLOW CONTROL VALVE CIRCUIT OPEN

For a complete wiring diagram Consult Diagrams/Electrical

- When Monitored:
With the engine running and the EGR Airflow Control Valve Motor command off.

- Set Condition:
The Engine Control Module (ECM) detects an open EGR Airflow Control Valve Motor (+) circuit for 0.5 second.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.Initial Inspection and Diagnostic Overview

Diagnostic Test

1. DTC IS ACTIVE
Ignition on, engine not running.
With the scan tool, Clear DTCs in the Engine Control Module (ECM).
With the scan tool, actuate the EGR Airflow Control Valve.
Monitor the scan tool for at least two minutes.
With the scan tool, select View DTCs.
Is the status Active for this DTC?

Yes

- Go To 2

No

- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure.Component Tests and General Diagnostics

2. EGR AIRFLOW CONTROL VALVE MOTOR (+) CIRCUIT OPEN OR HIGH RESISTANCE
Turn the ignition off.
Disconnect the EGR Airflow Control Valve harness connector.
Disconnect the Engine Control Module (ECM) harness connector.
Measure the resistance of the EGR Airflow Control Valve Motor (+) circuit between the EGR Airflow Control Valve harness connector and the Engine Control Module (ECM) harness connector.
Is the resistance below 10.0 ohms?

Yes

- Go to 3

No

- Repair the EGR Airflow Control Valve Motor (+) circuit for an open circuit or high resistance.
- Perform the ECM Verification Test Ver. 1. Verification Tests

3. EGR AIRFLOW CONTROL VALVE MOTOR (-) CIRCUIT OPEN OR HIGH RESISTANCE
Measure the resistance of the EGR Airflow Control Valve Motor (-) circuit between the EGR Airflow Control Valve harness connector and the Engine Control Module (ECM) harness connector.
Is the resistance below 10.0 ohms?

Yes

- Go to 4

No

- Repair the EGR Airflow Control Valve Motor (-) for an open circuit or high resistance.
- Perform the ECM Verification Test Ver. 1. Verification Tests

4. EGR AIRFLOW CONTROL VALVE
Connect the Engine Control Module (ECM) connector.
Replace the EGR Airflow Control Valve.
Turn the ignition on.
With the scan tool, Clear DTCs in the Engine Control Module (ECM).
With the scan tool, actuate the EGR Airflow Control Valve.
Monitor the scan tool for at least two minutes.
With the scan tool, select View DTCs.
Is the status Active for this DTC?

Yes

- Go to 5

No

- Test complete.
- Perform the ECM Verification Test Ver. 1. Verification Tests

5. ENGINE CONTROL MODULE (ECM)
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the EGR Airflow Control Valve and the Engine Control Module (ECM).
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out or corroded terminals.
Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.
Look for the data to change or for the DTC to reset during the wiggle test.
Search for any Technical Service Bulletins that may apply.
Were any problems found?

Yes

- Repair as necessary.
- Perform the ECM Verification Test Ver. 1. Verification Tests

No

- Replace the Engine Control Module (ECM).
- Perform the ECM Verification Test Ver. 1. Verification Tests