P0406
DTC P0406: EGR Valve Position Sensor Circuit High VoltageNOTE: 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 4.38 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. Connect EGR valve 6P connector terminals No. 1 and No. 2 with a jumper wire.
6. Turn the ignition switch ON (II).
7. Check the EGR VLS in the DATA LIST with the HDS.
Is 4.88 V or more indicated?
YES - Go to step 8.
NO - Go to step 19.
8. Remove the jumper wire from the EGR valve.
9. Measure voltage between EGR valve 6P connector terminals No. 2 and No. 3.
Is there about 5 V?
YES - Go to step 15.
NO - Go to step 10.
10. Turn the ignition switch OFF.
11. Jump the SCS line with the HDS.
12. Disconnect PCM connector C (22P).
13. Connect EGR valve 6P connector terminal No. 2 to body ground with a jumper wire.
14. Check for continuity between PCM connector terminal C12 and body ground.
Is there continuity?
YES - Go to step 26.
NO - Repair open in the wire between the PCM (C12)and the EGR valve, then go to step 21.
15. Turn the ignition switch OFF.
16. Connect PCM connector terminals A24 and C12 with a jumper wire.
17. Turn the ignition switch ON (II).
18. Check the EGR VLS in the DATA LIST with the HDS.
Is 4,88 V or more indicated?
YES - Go to step 26.
NO - Repair open in the wire between the PCM (A24) and the EGR valve, then go to step 21.
19. Turn the ignition switch OFF.
20. Replace the EGR valve.
21. Reconnect all connectors.
22. Turn the ignition switch ON (II).
23. Reset the PCM with the HDS.
24. Do the PCM idle learn procedure. Programming and Relearning
25. 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.
26. Update the PCM if it does not have the latest software, or substitute a known-good PCM.
27. 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.