| DTC P0406: | EGR Valve Position Sensor Circuit High Voltage |
| 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 3. NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the EGR valve and the ECM/PCM.n |
| 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.
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| 6. | Turn the ignition switch ON (II). |
| 7. | Check EGR VLS in the DATA LIST with the HDS. Is 4.88 V or more indicated? YES - Go to 8. NO - Go to 20. |
| 8. | Turn the ignition switch OFF. |
| 9. | Remove the jumper wire from the EGR valve 6P connector. |
| 10. | Turn the ignition switch ON (II). |
| 11. | Measure voltage between EGR valve 6P connector terminals No. 2 and No. 3.
Is there about 5 V? YES - Go to 16. NO - Go to 12 |
| 12. | Turn the ignition switch OFF. |
| 13. | Jump the SCS line with the HDS. |
| 14. | Disconnect ECM/PCM connector B (44P). |
| 15. | Check for continuity between EGR valve 6P connector terminal No. 2 and ECM/PCM connector terminal B33.
Is there continuity? YES - Go to 27. NO - Repair open in the wire between the ECM/PCM (B33) and the EGR valve, then go to 22. |
| 16. | Turn the ignition switch OFF. |
| 17. | Jump the SCS line with the HDS. |
| 18. | Disconnect ECM/PCM connector B (44P). |
| 19. | Check for continuity between EGR valve 6P connector terminal No. 1 and ECM/PCM connector terminal B29.
Is there continuity? YES - Go to 27. NO - Repair open in the wire between the ECM/PCM (B29) and the EGR valve, then go to 22. |
| 20. | Turn the ignition switch OFF. |
| 21. | Replace the EGR valve. |
| 22. | Reconnect all connectors. |
| 23. | Turn the ignition switch ON (II). |
| 24. | Reset the ECM/PCM with the HDS. |
| 25. | Do the ECM/PCM idle learn procedure. |
| 26. | 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 ECM/PCM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.n |
| 27. | Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM. |
| 28. | 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 ECM/PCM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM.n |