Circuit/System Verification
IMPORTANT:
If you cannot duplicate the condition, operate the vehicle within the conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
- If DTC P0403 is also set diagnose P0403 first.
- Observe that the EGR Position Variance parameter remains less than 4 percent difference while commanding the EGR valve to 10 percent.