Your Civic EGR Valve is usually a emissions valve the recycles exhaust gases earlier through your combustion chamber. This regulatory valve is designed to reduced harmful emissions to the atmosphere. Over time carbon develop up and also gunk can build up on your EGR valve and prevent the from working efficiently.

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When this happens your Honda engine code will cause a DTC trouble code and store it. Your check engine light will then turn on, and you might experience a loss of power and engine responsiveness. This particular day I’l be mirroring you exactly how to test your Honda public EGR valve in a 1997 Honda Civic. Return we’ll be working on a 1997 model, you can still use this guide to test most Civics from 1992 come 2000.


This Honda Civic EGR Valve DIY indict is meant for the 1996-1998 models v a 1.6 liter engine in it, however as proclaimed you deserve to use this come test any Civic indigenous 1992-2000. Our test automobile is a 1997 Honda civic HX v a manual transmission. When you want to check your Civic EGR Valve, there’s 3 contents you need to take a look at.

If you very own a Honda public EG (1992-1995), the trouble code of your OBDI vehicle must be retrieved jumping the 2 pin connector under your dash. As soon as your EGR valve isn’t working, this will certainly come back as a trouble password of 12.

The Honda public EK or (1996-2000) is an OBDII vehicle, and will have a trouble code of P0401. If you own a OBDII Honda Civic, use a scan tool 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 vital components the this device to check. The very first one is the actual EGR valve, i m sorry is usually mounted to the entry manifold.


This unit typically comes complete with the EGR pintle solenoid and the background sensor. This parts job-related together to path exhaust gases back into her engine. Here’s what each one of those components do individually so friend understand just how your Civic EGR Valve works.

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

The last part of her Honda civic EGR system is the yes, really ECU or engine computer. To find your Honda civic ECU, girlfriend will have to open her passenger next door and remove the kick panel.


From this point you will be undoing the 10mm bolts the secure the Honda civic ECU in place. Unplug the D ECU plug ( the furthest come the appropriate ), and 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 civic ECU we’ll start with is the D plug. This is the 16 pin connector that’s the furthest come your best if girlfriend are dealing with the former of the ECU plugs. You will be utilizing a multimeter to inspect the wires in our Honda public EGR wiring chart below.


The pins you’ll be checking is D1, D9 and also D11 as these space primary manage pins for your Civic EGR Valve. The worths you space checking for are below.

Honda civic ECU D1 pen – YELLOW / BLUE – 5 volts of DC powerHonda public ECU D9 pen – WHITE / black – EGR Pintle background SignalHonda civic ECU D11 pen – environment-friendly / black color – soil signal


The next part of our Civic EGR Valve wiring schematic is the Honda civic ECU plug displayed above. This plug is the outward one found on her Honda public ECU, called the A plug. This is a 30 pin unit and the wire you will certainly be check is pen 7. This is a PINK cable that’s the direct control wire for your Civic EGR Valve solenoid.

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When checking her EGR valve lift sensor, friend will watch that the green / black color wire share a floor signal with many other sensors in your 1.6 liter engine. The YELLOW / BLUE wire the connects come the EGR background sensor or transducer is likewise the very same 5 volt signal that feeds her Honda public TPS sensor.

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