Spec_Ops2087

I'll be connecting the External UEGO A/F guage into my "non-U" AEM EMS (aka the UEGO will be O2 sensor 2).

I just want to confirm a few things before I splice the wire. I know most people use C16 as the wire. I read the instructions and it has lambda 1 as C16, when they say "1" does that correspond to O2 sensor one (which would be incorrect in my case)? Should I tap into A23 (lambda 2) instead?

Once its pluged in, I enter in the CAL numbers for the table as stated in the UEGO manual under gasoline A/F vs Volts and then adjust gain till I'm near the set voltage (2.35 volts with the gauge disconnected as stated by the manual)

Finally I can log my A/F through the AEM datalogger program.

Did I miss anything?


Thanks

Venomous S

I got the 1052 EMS and yes lamba #1 corresponds to the primary oxygen sensor at C16.

However, the secondary oxygen sensor corresponds to C15 not A23.

Also, I was told by the EMS reps not to splice the output of my wideband, BUT TO cut the wire (C16) and wire the 5v output to the side going into the ECU, leaving the other side unconnected as that is the output coming from the stock 02 sensor

Spec_Ops2087

Must have misread the manual, your correct lambda is C15.

So your basically saying with the UEGO just completly replace the stock primary O2 sensor with the UEGO sensor and make the UEGO sensor O2 sensor #1 in the AEMPro software?

Will my tune be affected by this or does it not rely off of the A/F voltage of the primary O2 sensor (from what I see, it doesn't rely off of it).

Soul Coughing

the stock o2 sensors are not used with the AEM EMS

Venomous S

correct,
like SC said, the EMS will totally on the input from the wideband.
Both STOCK primary and secondary 02 sensors are out the window.

nMeOnE

does the EMS rely on the stock sensors if you dont have UEGO?

or does it just rely on the input from the tuner?

Spec_Ops2087

I think its just input by the tuner. There is nothing in the system that I see (aside from O2 feedback) that involves the A/F ratio.


Someone correct me if I'm wrong.

Spec_Ops2087

Bump, want to make sure the AEM EMS does NOT use the stock primary O2 sensor for tuning. I'm 99% sure it doesn't but since it has an option inside the software for the O2 sensors, I would like to make sure.

Venomous S

I am no expert to the EMS but from talking to the EMS folks, as long as you connect the the 5V output from yoru wideband gauge (which is what I got) to C16, the software will read from it.

Now, you to load the parameters into the table to define voltage to an a/f ratio and also you can't just splice the output into C16 as I said earlier. You have to cut the wire and solderd it to the side that's going into the ECU which is what I did.

Spec_Ops2087

Yup,

Looks like I'll be tackling it this weekend

The UEGO is accurate enough to tune from correct?