Your Civic EGR Valve is basically a emissions valve that recycles exhaust gases back through your burning chamber. This regulatory valve is draft to lower harmful emissions to the atmosphere. With time carbon develop up and also gunk can build up on her EGR valve and also prevent it from working efficiently.

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When this happens your Honda engine code will cause a DTC problem code and also store it. Your check engine light will certainly then turn on, and you might experience a lose of power and engine responsiveness. Today I’l be showing you just how to test your Honda public EGR valve in a 1997 Honda Civic. Return we’ll be functioning on a 1997 model, you have the right to still usage this overview to test most Civics native 1992 to 2000.


This Honda Civic EGR Valve DIY indict is supposed for the 1996-1998 models through a 1.6 liter engine in it, but as proclaimed you can use this to test any type of Civic indigenous 1992-2000. Our test automobile is a 1997 Honda civic HX with a hand-operated transmission. As soon as you want to test your Civic EGR Valve, there’s 3 components you should take a look at at.

If you very own a Honda civic EG (1992-1995), the trouble password of your OBDI car must it is in retrieved jumping the 2 pin connector under your dash. When your EGR valve isn’t working, this will come earlier as a trouble password of 12.

The Honda civic EK or (1996-2000) is an OBDII vehicle, and will have actually a trouble password of P0401. If you very own a OBDII Honda Civic, usage a scan device to retrieve the information from her Diagnostic Computer.

The parts of a Honda Civic EGR Valve

When your Civic EGR Valve isn’t functioning, there’s three critical components the this system to check. The first one is the yes, really EGR valve, i beg your pardon is usually mounted to the entry manifold.


This unit commonly comes finish with the EGR pintle solenoid and also the background sensor. This parts work-related together to course exhaust gases back into her engine. Here’s what each among those components do personal so friend understand how your Civic EGR Valve works.

EGR Valve – This component opens up and enables the exhaust gases come route into your entry manifold.EGR Pintle Solenoid – Activates the procedure of your EGR valve. This is likewise known together the EGR transducer, and also it’s connected by a two pin connector.EGR elevator Sensor – What educates your Honda public ECU of the real time place of her EGR valve. This is likewise known as the EGR position sensor.

The last part of her Honda civic EGR system is the really ECU or engine computer. To discover your Honda public ECU, girlfriend will must open your passenger side door and remove the absent panel.


From this suggest you will be undoing the 10mm bolts that secure the Honda public ECU in place. Unplug the D ECU plug ( the furthest to the ideal ), and also the A plug ( the furthest to the left)


Testing for ECU continuity because that your Honda Civic EGR Valve

The very first section of your Honda public ECU we’ll begin with is the D plug. This is the 16 pen connector that’s the furthest come your appropriate if you are encountering the former of the ECU plugs. You will be using a multimeter to examine the wires in our Honda civic EGR wiring chart below.


The pins you’ll be checking is D1, D9 and D11 together these room primary control pins because that your Civic EGR Valve. The values you room checking for space below.

Honda civic ECU D1 pen – YELLOW / BLUE – 5 volts the DC powerHonda civic ECU D9 pin – WHITE / black color – EGR Pintle background SignalHonda public ECU D11 pen – eco-friendly / black color – floor signal


The next component of our Civic EGR Valve wiring schematic is the Honda civic ECU plug displayed above. This plug is the outward one discovered on your Honda civic ECU, referred to as the A plug. This is a 30 pin unit and also the wire you will be check is pen 7. This is a PINK wire that’s the direct regulate wire for your Civic EGR Valve solenoid.

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When checking her EGR valve background sensor, girlfriend will watch that the green / black color wire share a ground signal with plenty of other sensors in your 1.6 liter engine. The YELLOW / BLUE wire that connects to the EGR lift sensor or transducer is additionally the same 5 volt signal the feeds her Honda civic TPS sensor.

If you’ve viewed your EGR valve wiring and also everything check out, you might need come clean or replace your EGR valve completely. Have any kind of questions around our how To test guide? Leave us a comment below and also let united state know!!