P0401
DTC P0401: EGR Insufficient Flow1. Reset the PCM
2. Test-drive under the following conditions.
- Without any electrical load.
- Decelerate from 55 mph (88 km/h) for at least 5 seconds.
3. Check the Temporary DTC with the 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 step 3.
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 terminal to EGR valve connector terminal No.6.
Did the engine stall or run rough?
YES - Intermittent failure, system is OK at this time.
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.