code 334 egr not open
Fleet Owner
Joined: Oct 2005
Posts: 20,789
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From: Kentucky
Code 334: EVP circuit above the closed limit of 0.67 volts.
That means the feedback signal to the PCM is too high when the EGR valve is supposed to be closed. This can be caused by a faulty EGR valve (which you already replaced), a faulty EGR Valve Position (EVP) sensor or one other possibility is the EGR Valve Regulator (EVR) is allowing vacuum through to the EGR when it is supposed to be closed.
Get a meter to verify the EVP output signal with the Key On Engine Off, then repeat with the Key On Engine Running. If they match then you probably have a bad EVP sensor. If the KOER value is higher then you most likely have a bad EVR.
For reference:
Fuel Injection Technical Library » EGR Valve Position sensor (EVP)
Fuel Injection Technical Library » EGR Vacuum Regulator (EVR)
That means the feedback signal to the PCM is too high when the EGR valve is supposed to be closed. This can be caused by a faulty EGR valve (which you already replaced), a faulty EGR Valve Position (EVP) sensor or one other possibility is the EGR Valve Regulator (EVR) is allowing vacuum through to the EGR when it is supposed to be closed.
Get a meter to verify the EVP output signal with the Key On Engine Off, then repeat with the Key On Engine Running. If they match then you probably have a bad EVP sensor. If the KOER value is higher then you most likely have a bad EVR.
For reference:
Fuel Injection Technical Library » EGR Valve Position sensor (EVP)
Fuel Injection Technical Library » EGR Vacuum Regulator (EVR)
Thread Starter
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Freshman User
Joined: Apr 2013
Posts: 30
Likes: 0
From: eldorado illinois
So I grounded it out I don't think it opened all I heard was noise coming from that you GR valve so do you think it's the e.g.r valve or the e.g.r valve position sensor both are less than 2 years old
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Fleet Owner
Joined: Oct 2005
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From: Kentucky
Did you meter the output voltage as I suggested before? If not, you are wasting your time and money.
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Fleet Owner
Joined: Oct 2005
Posts: 20,789
Likes: 1,753
From: Kentucky
The EVP Reference Voltage is only 5 VDC +/- 3% there is no way the output voltage was anywhere near 11.2 .
The error you have states the closed EGR voltage is too high. What is the EVP output with the Key On Engine Off? What is the EVP output with the Key On Engine Running? (No grounding of the EVR is required)
At this point we are not really concerned with the EVP output with the EGR fully open.
The error you have states the closed EGR voltage is too high. What is the EVP output with the Key On Engine Off? What is the EVP output with the Key On Engine Running? (No grounding of the EVR is required)
At this point we are not really concerned with the EVP output with the EGR fully open.
Thread Starter
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Freshman User
Joined: Apr 2013
Posts: 30
Likes: 0
From: eldorado illinois
I think I'm gonna have to find someone with more technical skills than Me I might not have this meter on the right setting heck I'm not even sure if I'm reading it right or not I'll find someone with a little better knowledge of this and I'll get back to you
Fleet Owner
Joined: Oct 2005
Posts: 20,789
Likes: 1,753
From: Kentucky
You are really close, put the Red lead of your meter on the Brown/Light Green wire of the EVP sensor. Put the Black lead on the Gray/Red wire. Turn the key to the On position, see what the meters reads when it is set to measure DC voltage.