Gm Egr Valve Wiring Diagram

The car being tested has a 3100. This type of egr valve has made the auto repair industry and gm a ton of money over the years since it s prone to carbon blockage. The egr valve that s covered by this article are for 3 1l 3 4l and 3 5l gm vehicles from 2000 to 2009 models years although some late 1999 models use this type of egr valve too.

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Gm egr valve wiring diagram. Wiring diagram courtesy of alldata. Egr valve code po401. To make sure this tutorial applies to your specific vehicle check this section out first. Using the scan tool command the egr valve open or reconnect the egr valve electrical connector as this will partially open the egr valve.

This will allow exhaust gas to. The testing procedures shown in this video apply to all electronic style egr systems. Identifying the egr valve. Well the good news is that this is an egr valve and egr valve system that is very easy to test and diagnose and this article will walk you thru the entire diagnostic troubleshooting process.

The exhaust gas re circulation egr system is designed to reintroduce exhaust gas into the combustion chambers thereby lowering combustion temperatures and reducing the formation of oxides of nitrogen nox. In particular the 5 wire linear egr valve used on many different gm vehicles. Command the egr valve on on a vehicle without vvt the pcm of a vvt equipped vehicle would retard the exhaust camshaft. Open the air and ﬂuid valves on the supply tool and continue service until the supply tool is empty.

For vehicles without an egr cooler bypass valve.