Thread: P1400 Pita Code

1) I have look between both forums for answers and have not gotten a clear solution

2) I have tried the resistors 68k and 100k ohms and still got the cel.

3) 96 200sx with g20 ecu with egr delete on a lowport motor

Ok, I need to pass emission and this code is killing me. P1400 Differential Pressure Feedback Egr Circuit Low Input is what I'm getting.

input please

Ive got that same ****er.

I asked Ben at JWT and all he said was 68K Ohm for egr temp and 440K Ohm for rear O2...
The code used to not trigger the cel but it does again...I just kinda check the codes every couple of days to make sure nothing else came up.

This is an OBD2 safety check - it knows the EGR is not there, so it's throwing a code.
OBD2 cars do this.

Reinstall the EGR if you want to pass.

Figured

However what sensor is telling the ecu it has low pressure. Once I know, I can either do a quick re-pin on the ecu or add whatever resistor needed to trick the dam thing.

I know this code has been giving others headaches seeing the cel on because of it.

I mentioned this on the other thread, but figured i'd update this one for search results.

OBD2 has checks and balances against resistor/diode tricks, so it expects the EGR to be on during 0-50% throttle, off during 50%+ throttle, and idle.

So no diode/resistor/short circuit can get around it. Maybe on an OBD1 car, but not these.

You are better off with the EGR installed anyway. It cools your intake charge and causes your car to pollute less. If you are looking for more power, do it the right way.. cold air intake, thermal spacer for the throttle body and intake manifold, ETC.

how can pumping exhaust gas into the intake cool the intake charge? as far as I know the u.s. is the only country that uses egr and from what I can tell it's there to clog **** up with carbon and make you spend money fixing it.... nothing new even has it

Here are some links that will hopefully provide an explanation for you that you can understand:

If i remove the EGR valve, Will my intake get hotter or cooler? - Ford Mustang Forums

Exhaust gas recirculation - Wikipedia, the free encyclopedia

You are right in that it is not on all new cars. Some newer cars with constantly variable valve timing on both cams do not have it because they don't need it. But at the same time, they have two catalytic convertors per exhaust bank rather than one. The engine and engine computer for our SR20DEs were made to run with EGR, and there is no advantage to removing it, especially on an OBD2 car.

You can gain some low-throttle responsiveness at the expense of worse emissions and fuel economy, but it's not worth it. It's not good for any power when you're actually stepping on the pedal, where it counts.

Understanding Exhaust Gas Recirculation Systems

"A well-designed system will actually increase engine performance and economy. Why? As the combustion chamber temperature is reduced, engine detonation potential is also reduced. This factor enabled the software engineers to write a more aggressive timing advance curve into the spark timing program. If the EGR valve is not flowing, onboard diagnostics (OBD) systems will set a code and the power control module (PCM) will use a backup timing curve that has less advance to prevent engine ping. Less timing advance means less performance and economy."

That makes sense. lower combustion temperatures = less ping = opportunity for advanced timing.

The FSM says that code is from the EGR solenoid. I just left mine plugged in. Also left the EGR temp sensor plugged in. Never thrown a code for those. The only reason my CEL is on now is stupid P0705 (park/neutral switch) and an ignition misfire code from the MSD ignition box.

Thats what I'm trying to understand. How is it that some people get this code while others don't? My EGR temp sensor is still pluged in as well, so it must be some else.