Stoner_1

Hello all....

I've just recently decided to pull my AEM EMS and manualy tune my 2.5L S2K via the APEXI VFAC-II.

Note: I am stationed in Italy currently and have thus far found it impossible to tune the EMS system here, nor have I been able to do this thru Torque Freaks (E-Tuning). This is another painful sorted story that cost me 600 clams and got me nowhere!

One little snag I hit recently was the fact that the factory ECU is looking for the O2 #1 Heater Circuit by pop'ing the following cell code: PO135, "Primary HO2 (Sensor 1) Heater Circut Malfunction".

I beleive this has to do with the fact that with the AEM UEGO controler and Wideband O2 sensor installed as per (S2KI UEGO Wideband O2 install) there is no longer a heater coil to provide the needed 3.3 ohms of resistance (4P connector pins 3 & 4) required by the factory ECU. (ECU is looking for a voltage drop across the O2 heater coil) Please see OEM manual page 11-61 for details...

Basicly what I am asking is, "Can i place a 3.3 ohm resister in my Frog harness to simulate the O2 Sensor heater coil?"

Also:

1) Whats the easiest way to about doing this?

2) What wattage resistor do i need?

3) Is there anything else i need to consider or that i may have overlooked?

4) I saw this post about moding a harness for the O2 #2 Sensor: (Slows2k's O2 #2 solution)

Ek9

Well, I = V/R

14 volts/3.3 ohms = 4.23 amps.

(I^2 * R) or (I * E) = watts so, 60 watts?

What I did was just hook up a factory O2 sensor to the heater wires and hung it with cable ties.

I ran into problems trying to drive a factory Integra ECU off the narrow band output of the uego. It didn't act like a factory O2 sensor.

What I'd do is have another bung welded on the exhaust, give the UEGO it's own bung then run the factory ECU off a factory O2 sensor.

Stoner_1

Thank you for your reply Ek9 !

[QUOTE=Ek9] Well, I = V/R

14 volts/3.3 ohms = 4.23 amps.

(I^2 * R) or

wildcardtrd

Odd question, but if you've pulled your AEM, why not re-install the stock O2 sensor and gut the UEGO entirely?

xviper

You shouldn't be trying to fool the PRIMARY O2 sensor. It runs the engine. You should put it back and tap another bung for the UEGO O2 sensor.

Stoner_1

I need a Wideband O2 sensor to run my 2.5L engine, which has 575 cl fuel injectors.

I have a Wide band O2 hooked into C16 (Primary O2 wire on ECU Harness) currently with the controller set to P3 (0-1 Volts output) See UEGO manual pages 3 and 4 for connection description.

NOTE: Like i said if there is anything else i should know about how to set this up properly, then you have my undivided attention!

RWD_RCKT

I don't think you can run a stock ECU with 575 injectors!

If you actually can, then you should definitely have a second bung welded in so you can run both 02 sensors (per XViper).

RWD_RCKT

I don't think even the E-Manage can run 575... can't they only run 550?

Anyways... Inline has got to have a decent base map which should get you half way there. Or are you starting from scratch?

Ek9

Resisters are rated in watts, not amps. You're not going to find a 120 watt resister, which is what you really should use, for any kind of reasonable price. You put a 60 on there and it's going to get damn hot.

Don't be surprised of the 0-1 volt output just doesn't work right. Factory narrow band O2's work on crosscounts. How often the voltage swings above and below .5V. What I've found was the UEGO 0-1 output didn't swing. It's basically a resistered down copy of the 0-5 volt output.

There's nothing magic about the S2000 ECU.

Stoner_1

I have asked, but have not gotten anywhere...