How to test a 5 wire electronic egr valve. Open 5v reference circuit from a bad engine computer ill also show you how i repaired this problem without.
P0402 Exhaust Gas Recirculation Egr System Excessive
Gm egr valve wiring diagram. Sign up today to access the guides. After miles of service the exhaust gas recirculation egr systemespecially the egr valvewill lead to engine performance problems due to carbon buildup components mechanical problems or vacuum hose leaks. The egr valve in photo 3 of 4 with the red x is not covered by this article and is tested differently. How to determine egr solenoid polarity with a wiring diagram. Learn how to access vehicle repair guides and diagrams through autozone rewards. Identifying the egr valve.
The egr valve thats covered by this article are for 31l 34l and 35l gm vehicles from 2000 to 2009 models years although some late 1999 models use this type of egr valve too. How to check the egr passages for a restriction. Learning how to test an egr valve will save you time money and some headaches. I asked a mechanic about it and he suggested i unplug the egr to see if i noticed any difference. To make sure this tutorial applies to your specific vehicle check this section out first. Finally this week the misfires were more noticeable and it set codes.
How to determine egr solenoid polarity with a voltmeter. The exhaust gas recirculation valve within your vehicle is a crucial component in reducing harmful emissions and ensuring your vehicle runs smoothly. P0300 random misfire and p0405 egr circuit. In particular the 5 wire linear egr valve used on many different gm vehicles. The egr valve in photo 4 of 4 with the green check mark is the one covered by this article. The egr system allows exhaust gas to be introduced into the intake stream in order to cool combustion chamber temperatures under load.
In this video i show another variable when it comes to testing this type of egr valve. Egr valve test 2000 2009. From a search on the egr others suggested trying to clean it. How the pcm tests the egr. In particular the 5 wire linear egr valve used on many different gm vehicles. If you need the egr valve test for the egr valve marked with the x you can find it here.
This reduces nox emissions and helps prevent pinging detonation the egr valve is closed at idle. Electronic egr valves are used in vehicles dated 1990 and up. The vehicle computer operates the valve instead of previous years egr valves which are operated by the engine vacuum. With the egr valve unplugged it ran smoother. On throttle application the egr valve will be commanded open by the pcm as needed. The car being tested has a 3100.
The testing procedures shown in this video apply to all electronic style egr systems. The car being tested has a 3100 engine in it.
Gallery of Gm Egr Valve Wiring Diagram
