P0401

P0401- EGR SYSTEM PERFORMANCE

For a complete wiring diagram Consult Diagrams/Electrical.

- When Monitored:
With the engine running.

- Set Condition:
The ECM detects and EGR flow problem for 8.0 seconds





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

Diagnostic Test

1. VERIFY ACTIVE DTC
With the scan tool, erase ECM DTC's
Test drive the vehicle.
With the scan tool, read ECM DTC's
Did this DTC set again?

Yes

- Refer to symptom CHECKING THE EGR SYSTEM for further diagnosis.

No

- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure.Intermittent Condition