Operation CHARM: Car repair manuals for everyone.
Hosted by mcallihan.com

Circuit Testing

Dignostic Trouble Code P0404 checks for a malfunction in the circuitry and hardware of the Linear EGR valve. The ability of the PCM to control the EGR valve is checked with this test. When the PCM commands the EGR valve to a desired position and changes that position less than a calibratable amount, this test then checks the EGR pintle position error. If the pintle position error, which is the difference between the desired pintle position and the actual pintle position, is too great then this DTC is set. Refer to Dignostic Tables / DTC P0404. Testing and Inspection