Thread: EGR and Brake Fault Codes

Originally Posted by Tins

Is there anything it does like?

Just to be driven, use the functions it has like HDC, etc and just drive it

Originally Posted by DiscoJeffster

If they’re faulty, no software patch will help on a D4. The self test will still fail and flag a fault. The patch only changes the pattern of operation under normal use.

I was told the EGR valves can be blanked off and code added to the ECU to not fault. I've heard this a few times. Has anyone done this and any idea of cost. I've put about 50ks on the car since cancelling the codes, and fault has not presented again. Is there a way using the Gap tool to identify if they are in fact faulty?

Thanks again everyone for your thoughts. Greatly appreciated.

Originally Posted by Morris

I was told the EGR valves can be blanked off and code added to the ECU to not fault. I've heard this a few times. Has anyone done this and any idea of cost. I've put about 50ks on the car since cancelling the codes, and fault has not presented again. Is there a way using the Gap tool to identify if they are in fact faulty?

Thanks again everyone for your thoughts. Greatly appreciated.

Not in a D4 you can’t. The D4 does a self test each start and will fault if they’re not present and working. You will get a check engine if you do block them. I am not aware of anyone having got around that aside from the emulators that were developed, with limited success.

What the coders do is rewrite the opening pattern so they effectively aren’t used during normal running, but in a D4 they still need to be there and working. In a D3 on certain models you can code them out and remove them.

Originally Posted by DiscoJeffster

Not in a D4 you can’t. The D4 does a self test each start and will fault if they’re not present and working. You will get a check engine if you do block them. I am not aware of anyone having got around that aside from the emulators that were developed, with limited success.

What the coders do is rewrite the opening pattern so they effectively aren’t used during normal running, but in a D4 they still need to be there and working. In a D3 on certain models you can code them out and remove them.

So it looks like I have to replace the EGR valves. Is there a way to definitely diagnose that they are faulty? Gap tool?

Thank you.

The D4 EGR valves only have to move correctly for the test and clean cycle which occurs when the engine isn't running. Therefore airflow or lack thereof through the valves can't be deduced from MAF and MAP values in conjunction with the EGR throttle valve if they have been mapped-out.

Originally Posted by DiscoJeffster

Not in a D4 you can’t. The D4 does a self test each start and will fault if they’re not present and working. You will get a check engine if you do block them. I am not aware of anyone having got around that aside from the emulators that were developed, with limited success.

What the coders do is rewrite the opening pattern so they effectively aren’t used during normal running, but in a D4 they still need to be there and working. In a D3 on certain models you can code them out and remove them.

I would check with Cambo on that, I believe his software may allow unplugging

Originally Posted by Tombie

I would check with Cambo on that, I believe his software may allow unplugging

And I did and I stand corrected. And quote

“The usual tune for 3.0 keeps the EGRs functional, just reprogrammed to only vent manifold pressure when you get off the throttle, they don't open up to let exhaust gases in.

Though it's also possible to do a full delete in the tune as well, so you could put in blanking plates, just need to know exactly what you want at the time.
“

Originally Posted by DiscoJeffster

And I did and I stand corrected. And quote

“The usual tune for 3.0 keeps the EGRs functional, just reprogrammed to only vent manifold pressure when you get off the throttle, they don't open up to let exhaust gases in.

Though it's also possible to do a full delete in the tune as well, so you could put in blanking plates, just need to know exactly what you want at the time.
“

And worthwhile adding, I understand that the functionality Cambo includes to use the EGRs to vent pressure when you get off the throttle is a mod to help reduce the chance of splitting the intake manifolds. Acts as a secondary blow off valve.

So probably a good one to keep on the 3.0.