How many wires are on the GM EGR valve?
How many wires are on the GM EGR valve?
The connector on the EGR valve has 5 wires and normally the letters A thru’ E are stamped on the EGR valve itself (but not always). I’ll be using these same letters in all of the photos in the image viewer so that you’ll know what wire to test. Below are the circuit descriptions: EGR Valve Control (provided by the PCM).
Do you need to unplug the EGR valve?
To test these circuits, it’s not necessary to unplug the EGR valve’s connector. What I recommend you do is to test for each signal with the connector connected using a wire-piercing probe. This is the easiest and the most effective way of getting at the signals.
Where can I find the EGR valve test?
The EGR valve in photo 3 of 4 (with the red X) is not covered by this article and is tested differently. The EGR valve in photo 4 of 4 (with the GREEN check mark) is the one covered by this article. If you need the EGR valve test for the EGR valve marked with the X, you can find it here:
How to test the GM EGR valve-Buick, Olds, Olds?
By looking at the base of the EGR valve. To illustrate this, look at photo 3 of 4 and photo 4 of 4 in the image viewer above. The EGR valve in photo 3 of 4 (with the red X) is not covered by this article and is tested differently. The EGR valve in photo 4 of 4 (with the GREEN check mark) is the one covered by this article.
The connector on the EGR valve has 5 wires and normally the letters A thru’ E are stamped on the EGR valve itself (but not always). I’ll be using these same letters in all of the photos in the image viewer so that you’ll know what wire to test. Below are the circuit descriptions: EGR Valve Control (provided by the PCM).
How do you test the power of an EGR valve?
This a very simple test for which you can use a multimeter or a test light to accomplish. You can test for power with the EGR valve connected or disconnected to its connector. Of course, what I recommend you do is to test it connected to its connector and with a wire piercing probe piercing the wire to get at the voltage.
To test these circuits, it’s not necessary to unplug the EGR valve’s connector. What I recommend you do is to test for each signal with the connector connected using a wire-piercing probe. This is the easiest and the most effective way of getting at the signals.
By looking at the base of the EGR valve. To illustrate this, look at photo 3 of 4 and photo 4 of 4 in the image viewer above. The EGR valve in photo 3 of 4 (with the red X) is not covered by this article and is tested differently. The EGR valve in photo 4 of 4 (with the GREEN check mark) is the one covered by this article.
To make sure this tutorial applies to your specific vehicle, check this section out first: Identifying The EGR Valve. You can find this tutorial in Spanish here: Cómo Probar La Válvula EGR Electrónica (3.1L, 3.4L GM) (at: autotecnico-online.com ).
What happens when something goes wrong with the EGR system?
When something goes wrong with the EGR system, you usually see one of the following: Chunks of carbon blocking the EGR valve’s pintle from fully seating in its seat. Now, as you may already know, exhaust gas cannot recirculate back into the engine at engine idle.
