The exhaust gas recirculation (EGR) valve is controlled by the engine control module (ECM) through the EGR solenoid. A reference voltage is supplied to the EGR valve solenoid. The ECM controls the solenoid by grounding the control circuit.

The ECM detects the EGR flow is not plausible.

DTC P1409 is a Type C DTC.

DTC P1409 is a Type C DTC.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON, observe the DTC information with a scan tool. Verify that no other DTCs are set.

⇒	If any other DTCs are set, refer to Control Module References for further diagnosis.

2. DTCs P0401 or P0402 should not set.
3. Command the Intake Air Flow Valve Position from 0-100% with a scan tool. The throttle plate should respond to the scan tool commands.

⇒	If the throttle body does not respond to the scan tool commands, refer to Throttle Body Assembly Replacement for further diagnosis.

4. Command the EGR Valve from 0-100% with a scan tool. The EGR valve should respond to the scan tool commands.

⇒	If the EGR valve does not respond to the scan tool commands, refer to DTC P0405 or P0406 for further diagnosis.

5. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

1. Ignition OFF, inspect for the following:

•	Intake system/charge air hoses for leaks/restrictions

•	Exhaust system/turbo charger for leaks/restrictions

•	Air filter for restrictions

2. Engine running at idle, command the EGR valve ON with a scan tool. Verify that the scan tool MAF Sensor parameter is below 16 kg/h

⇒	If the parameter is greater than the specified value, replace the Q14 Exhaust Gas Recirculation (EGR) Valve.

3. Command the EGR Valve OFF with a scan tool. Verify that the scan tool MAF Sensor parameter is greater than 25 kg/h

⇒	If the parameter is below than the specified value, replace the Q14 Exhaust Gas Recirculation (EGR) Valve.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Exhaust Gas Recirculation Valve Replacement