## DTC Troubleshooting: P0401 (80-1)

DTC P0401 (80-1): | EGR Insufficient Flow

1. | Reset the ECM/PCM.

2. | Test-drive under the following conditions. Without any electrical load. Decelerate from 88 km/h (55 mph) for at least 5 seconds.

3. | Check the Temporary DTC with scan tool. Is Temporary DTC P0401 indicated? YES - Clean the intake manifold EGR port with carburetor cleaner. Clean the passage inside the EGR valve with carburetor cleaner or replace the EGR valve. NO - Intermittent failure, go to 4.

4. | Turn the ignition switch OFF.

5. | Disconnect the EGR valve 6P connector.

6. | Connect the battery positive terminal to EGR valve connector terminal No. 4.

7. | Start the engine and let it idle, then connect the battery negative to terminal No. 6. Did the engine stall or run rough? YES - Intermittent failure, system is OK at this time.n NO - Clean the intake manifold EGR port with carburetor cleaner. Clean the passage inside the EGR valve with carburetor cleaner or replace the EGR valve.n