Quote:
Originally Posted by oab_au
The Californians got a harder set-up. The rest just got a code 34 for EGR solenoid inoperative. You got that 34 one, a code 55 for the EGR temp sensor, and a code 56 for stuck open/closed EGR. 
The 56 is interesting as to how it detects this problem. My guess is that it probably looks for a drop in the MAF reading to account for the unmetered air, at the same throttle position and same rpms.
Harvey. |
That would be my guess as well. The drop is likely programmed into the mapping for when the valve opens and when that external air supply isn't there the 02's pick up on a rich mixture and make the assumption.
Tom