P0402 code

[Shahram]

I searched, I promise, but it's still unclear to me.

I was throwing a P0401 code, but then changed the VSV modulator (?). Now I'm throwing a P0402 code.

I know the information is in here somewhere, I just can't tell what it is...what is the fix for the P0402 code? I know it's EGR Excessive Flow Indicated, but what are the "symptoms" of this, and how should I approach it?

Thanks, and sorry if I am reposting. It just isn't clear to me.

 

[tarbe]

I had the exact scenario you describe.

After I cleaned my egr temp sensor and cleaned out the port on the ds rear of the intake where the hose from the egr valve connects, I have been rid of the light for about 6 months now.

I cleaned the sensor with 4-0 steel wool until it was nice and shiney clean.

Prior to cleaning the sensor, I could not keep my light off for more than a few days.

Good luck!

 

[RavenTai]

Shahram, I am going through a P0401 right now, give this a read and see what you think,

https://forum.ih8mud.com/showthread.php?t=111750

after playing with it today I think that a clog in the VSV side plumbing, or a VSV that will not open, is more likely to give a 402,

the VSV and the modulator are two diffrent parts, I assume you replace the modulator? it is the flying sauser lookign thing on top of the motor, the VSV is a little solenoid valve hidden under the intake

 

[landtank]

based on my recent run with my daughters Camry I might know what's going on.

On the Camry the VSV is normally open. It closes when power is applied. Now this might seem strange until you realize that the valve will be open most of it's life so why power it during that cycle, better to power it during the closed cycle or during idle.

How does this help? Well if you didn't plug in that new VSV completely them the valve would never get power and always be open and throw an excessive EGR code.

Hope this applies to the Cruiser.

 

[RavenTai]

Rick you are close, on the cruiser air flows through the VSV when the power is off, but when air flows is when the EGR is shut down by the VSV,

The VSV ports ambient pressure air in to defeat the vacuum signal from the modulator,

So when the VSV is powered the air does not flow and the EFR system works per a schedule from the modulator