DTC Troubleshooting: P0404 (12)

DTC P0404:  EGR Valve Circuit Range/Performance Problem

1.Turn the ignition switch ON (II).

2.Do the DTC CLEAR in the CLEAR MENU with the HDS.

3.Do the EGR TEST in the INSPECTION MENU with the HDS.

Is the result OK?


YES - Intermittent failure, system is OK at this time. Check for poor connections or loose teriminals at the EGR valve and the ECM.n


NO - Go to 4.


4.Turn the ignition switch OFF.

5.Replace the EGR valve.

6.Turn the ignition switch ON (II).

7.Do the ECM RESET in the CLEAR MENU with the HDS.

8.Do the ETCS learn procedure.

9.Start the engine. Hold the engine speed at 3,000 rpm (min-1) with no load (in neutral) until the radiator fan comes on, then let it idle.

10.Do the EGR TEST in the INSPECTION MENU with the HDS.

11.Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS.

Are any Temporary DTCs or DTCs indicated?


YES - If DTC P0404 is indicated, check for poor connections or loose terminals at the EGR valve and the ECM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC troubleshooting.


NO - Go to 12.


12.Do the EGR TEST in the INSPECTION MENU with the HDS.

Is the result OK?


YES - Troubleshooting is complete.n


NO - Check for poor connections or loose terminals at the EGR valve and the ECM, then go to 10 and recheck.