Test Description

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

1. 2
   
   This step verifies that the malfunction is present.
2. 4
   
   If DTC P1404 will only set under certain conditions, the malfunction may be intermittent. Refer to 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 P1404 continues to set, replace EGR valve.