DTC Troubleshooting: P0406 (12)
  1. Check for continuity between ECM connector terminal B34 and EGR valve 5P connector terminal No. 3.
Is there continuity?
YES -
Go to Step 18 .
NO -
Repair open in the wire between the EGR valve and the ECM (B34), then go to Step 13 .
  1. Turn the ignition switch to LOCK (0).
  1. Replace the EGR valve.
  1. Reconnect all connectors.
  1. Turn the ignition switch to ON (II).
  1. Reset the ECM with the HDS.
  1. Do the ECM idle learn procedure.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0406 indicated?
YES -
Check for poor connections or loose terminals at the EGR valve and the ECM, then go to Step 1 .
NO -
Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.■
  1. Reconnect all connectors.
  1. Update the ECM if it does not have the latest software, or substitute a known-good ECM.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0406 indicated?
YES -
Check for poor connections or loose terminals at the EGR valve and the ECM. If the ECM was updated, substitute a known-good ECM, then recheck. If the ECM was substituted, go to Step 1 .
NO -
If the ECM was updated, troubleshooting is complete. If the ECM was substituted, replace the original ECM. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.■