Test Description

The numbers below refer to the step numbers in the diagnostic procedures.

1. 2
   
   This step verifies that the malfunction is present.
2. 3
   
   If DTC P0404 will only set under certain conditions, the malfunction may be intermittent. See DIAGNOSTIC AIDS . If an intermittent wiring problem is not present, test for a faulty connection at the PCM or the EGR valve. If the connections are okay and DTC P0404 continues to set, replace the EGR valve.