P0406

DTC P0406: EGR Valve Position Sensor Circuit High Voltage

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.

1. Turn the ignition switch ON (II).
2. Check the EGR VLS in the DATA LIST with the HDS.

Is 4.88 V or more indicated?

YES - Go to step 3.

NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the EGR valve and the PCM.

3. Turn the ignition switch OFF.
4. Disconnect the EGR valve 6P connector.
5. Turn the ignition switch ON (II).




6. Measure voltage between EGR valve 6P connector terminals No. 2 and No. 3.

Is there about 5 V?

YES - Go to step 8.

NO - Go to step 7.




7. Measure voltage between PCM connector terminals C12 and C14.

Is there about 5 V?

YES - Repair open in the wire between the EGR valve and the PCM (C12), then go to step 10.

NO - Go to step 14.

8. Turn the ignition switch OFF.
9. Replace the EGR valve.
10. Turn the ignition switch ON (II).
11. Reset the PCM with the HDS.
12. Do the PCM idle learn procedure.
13. Check for Temporary DTCs or DTCs with the HDS.

Are any Temporary DTCs or DTCs indicated?

YES - If DTC P0406 is indicated, check for poor connections or loose terminals at the EGR valve and the PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

NO - Troubleshooting is complete.

14. Update the PCM if it does not have the latest software, or substitute a known-good PCM.
15. Check for Temporary DTCs or DTCs with the HDS.

Are any Temporary DTCs or DTCs indicated?

YES - If DTC P0406 is indicated, check for poor connections or loose terminals at the EGR valve and the PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

NO - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM.