When did GM start using the EGR valve?
When did GM start using the EGR valve?
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). To make sure this tutorial applies to your specific vehicle, check this section out first: Identifying The EGR Valve.
What are the letters on an EGR valve?
Most of the EGR valves will have the letters A thru’ E molded onto the EGR valve’s connector. I’ll be using these same letters for the circuit descriptions below: Ground circuit for EGR valve solenoid. Gray with Black stripe wire. EGR valve pintle position sensor Ground (provided by the PCM). Black wire. EGR pintle position signal circuit.
What causes an EGR valve to not close?
By far the most common cause of this code is carbon build-up on the pintle and its seat that prevents the valve from closing fully. Other possible causes could include the following- Damaged, burnt, shorted, disconnected, or corroded wiring and/or connectors. Open circuits. Defective EGR valve.
What causes the VCM to set the p1404 DTC?
SEVERE OCCURRENCES MAY CAUSE THE VEHICLE CONTROL MODULE (VCM) TO SET A P1404 DTC BECAUSE THE VCM PERCEIVES THAT THE EGR VALVE IS STUCK OPEN. 1. USING THE TECH 2 SCAN TOOL, EXERCISE THE EGR VALVE, AND VERIFY THE [EGR] VALVE’S ACTUAL AND DESIRED POSITION TRACK.
What is the diagnostic code for the EGR valve?
When a piece of carbon blocks the EGR pintle from seating, you get one of the following diagnostic trouble codes: P1404 or P1406. The EGR passages inside the intake manifold get clogged with carbon. When this happens, you’ll get a diagnostic trouble codes P0401.
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.
SEVERE OCCURRENCES MAY CAUSE THE VEHICLE CONTROL MODULE (VCM) TO SET A P1404 DTC BECAUSE THE VCM PERCEIVES THAT THE EGR VALVE IS STUCK OPEN. 1. USING THE TECH 2 SCAN TOOL, EXERCISE THE EGR VALVE, AND VERIFY THE [EGR] VALVE’S ACTUAL AND DESIRED POSITION TRACK.
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?
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 ).
How many wires are in an EGR valve?
There are 5 wires sticking out of the EGR valve’s connector, in this section we’ll explore what each one does. Most of the EGR valves will have the letters A thru’ E molded onto the EGR valve’s connector. I’ll be using these same letters for the circuit descriptions below: Ground circuit for EGR valve solenoid. Gray with Black stripe wire.
