DTC Troubleshooting: P0406 (12)
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 to ON (II).
  1. 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, the system is OK at this time. Check for poor connections or loose terminals at the EGR valve and the ECM/PCM.■
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect the EGR valve 6P connector.
  1. Turn the ignition switch to ON (II).
  1. Measure the voltage between EGR valve 6P connector terminals No. 2 and No. 3.
Is there about 5 V?
YES -
Go to Step 11 .
NO -
Go to Step 7 .
  1. Turn the ignition switch to LOCK (0).
  1. Jump the SCS line with the HDS.
  1. Disconnect ECM/PCM connector B (44P).