Circuit/System Testing
WARNING: This page is about a different car, the 2009 Pontiac Torrent and 2009 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
- Verify the following conditions are not present:
- Incorrect EGR valve for engine application
- A vacuum leak between the EGR valve and the intake manifold
- Signs of external leakage usually indicated by carbon buildup around the mating surfaces of the components or an audible exhaust noise
- Restrictions in the passages or EGR valve caused by carbon deposits or casting flash
- MAP sensor for being shifted, stuck, skewed, and for correct vacuum supply-Refer to DTC P0106 .
- Leaking, restricted, or modified exhaust system
- Mechanical failure in the engine such as worn piston rings, camshaft, or incorrect timing components installation-Refer to Symptoms - Engine Mechanical .
IMPORTANT: Restrictions can cause excessive back pressure and low engine vacuum. - If all conditions test normal, replace the EGR valve.