I have the GT Motoring kit, my air pump had and issue and was causing random multiple misfires. So at 1st it worked and my car was running better till the battery died. Now I cant go back and re-install it. So my question is, with an engine manage like hondata or aem, can I finally disconnect the GT Motoring kit and not set off a CEL? I was kinda thinking of running the GReddy Ultimate but I dont think it can turn off the cel on the air pump. I have no experience with any of the units, just my old hondata s300 on my h22 civic.

 

With an Hondata K-Pro you can throw out the airpump and all that stuff. K-Pro doesn't connect to that system.
I run my car without it and there's absolutly no CEL or any other problem. Hondata confirmed this:

https://www.s2ki.com/forums/index.php?showtopic=764615

 

Caleb, that pump circuitry spike to 4.8 is just the pump turning on. I'm not certain if the sensor looks for that spike, but I wouldn't be surprised.

Also, it appears that the O2 sensor is tied to the TPS. In short, when the TPS is >idle, the ECU expects the O2 sensor to come off of 0, but still read lean. It appears that when you blip the throttle, the Air Pump Relay is triggered off. So while the Vac solenoid is open, there's no air being pumped directly into the exhaust. Makes sense, as the ECU needs to know what the A/F mixture is while driving (throttle is being used) - not so much at idle.

Conceivably, you could fool the ECU by keeping the throttle open. A quick test with the data logger could prove/disprove this theory - adjust your throttle cable or TPS sensor to trick the ECU into thinking the throttle is being used. Do this 3 ways: air pump plugged in; air pump unplugged, no throttle; air pump unplugged with throttle. See if you pop the same CEL each time/what the datalog shows.

The Vac Solenoid is easy enough to replace with a 40ohm resistor (yes, the coil is 40ohms...I've been having some air pump issues of my own related to the solenoid). You might not even need the resistor, might be able to get away with shorting the pins in the solenoid connector together - that's, essentially, what the ECU will see there anyway (this particular circuit is designed to have 12v at the solenoid coil when the key is in "run". The ECU controls a switch to ground that activates the solenoid when the air pump is running)

 

The stock narrowband O2 sensor sees only rich/lean.

This is the hard part...but I think it could be managed as follows:

Use the Pump Relay voltage/ground to activate/deactivate the signal from the O2 sensor. At idle, the ECU will look for TPS low (<.48V I believe) and O2 to be lean (or <1V). Adjusting the TPS can cause an idle CEL, so I'm not sure that's the way to go (although I did recommend doing so for troubleshooting/research purposes in my last post). But, we could use that Pump Relay to switch the narrowband from rich to lean or vice versa... i.e. O2 sensor is on/off...so is the vac solenoid - and these both are correspondent to the TPS. There would need to be a small cap to mimic the time window between when the Pump Relay is switched off and when the O2 sensor drops back to 0...but that's easy enough to figure out.

 

Come on guys, don't let this die!

 

It's so frustrating that a work around hasn't been developed yet.

 

I bet you the emanage ultimate could be used to fix this and tune the car

 

So the pump can be removed and it wont effect performance? the only effect will be engine check light?

 

yes

 

How?

Because I had an eMan Ult and still threw CELs for the Air Pump...

What setting needs to be edited to fool the stock ECU into not looking for the Air Pump (or looking for it and being fooled into believing it's there)?