Wiring up an AEM AFR WBO2 to a 2000?
 

Sorry for the noob question, but I cannot find any concrete information about wiring up an AEM 30-0300 X-Series WBO2 UEGO, into any NB Miata? I can find plenty of info about an NA car, but none for the NB? I believe this is my 2nd post here. I'm usually just a lurker here, but I finally have a question.

I'm installing an MSPNP2 along with the WBO2. I'm deleting my NBO2's, as emissions aren't in Alabama.

I've been researching all day and I'm sure I'm overlooking and overthinking the whole process, but what I need to know is, which wire coming off the new WB harness do I need to splice into the stocks O2 plug harness? I have included pics of all the wire colors.

This is the 5 wire new WBO2 Sensor

http://i43.photobucket.com/albums/e3..._152618531.jpg

This is the new WBO2 Harness

http://i43.photobucket.com/albums/e3..._152657117.jpg

This is the stock harness O2 wire colors; Solid Blue, Black w/White stripe, Black w/Red stripe, Pink w/Yellow stripe.

http://i43.photobucket.com/albums/e3...3024497_LL.jpg

No picture, but the stock O2 sensor wires are White, White, Black and Grey.

You're better off wiring directly to the ECU

I also replied to miata.net but my reply there awaits moderation.

This won't work, you can't plug in a wideband sensor as-is to the Megasquirt, you need to get a gauge (controller) that will connect to the sensor, and the controller will output a single signal wire to the Megasquirt.

You shouldn't have to splice any wires of the WB harness. I'm not too familiar with your WB, but just glossing over the images, it looks like it should be wired up so:

• 2 Connectors in Red connect to one another
• 2 Connectors in Blue connect to WB Gauge
• Wires in Green are your output signals that you would wire to the MS or O2 harness

Attachment 228471

I wasn't sure if I could do that or not, but it would definitely be easier!

I have the complete gauge/WBO2 kit.

That pic looks identical to my kit. So, for the wires in the Green circle above, I know red and black are power and ground. The rest of the wires say they're optional in the instructions? I'll post a pic of it next.

Read the instructions? I can't tell from the pic, it looks like there are 4 wires. As you said, red and black are power and ground. I imagine the other 2 are your output signals and I would think one is for WB (0-5V) and Narrow Band (0-1V). Refer to your instructions for which is which.

You can, refer to this page: MegaSquirtPNP by DIYAutoTune.com

Yes, I read the instructions. I read the instructions for anything I buy. I'm just unsure if I want to mess with this. I'm old school, V8's, carbs, load pipes, etc. I bought the Miata for my wife and kinda started modifying it, LOL! This new era of tuning cars scares me a little and I don't want to mess up the car with something wired up wrong. All the videos I've watched said you had to splice the wires in the stock harness and the instructions don't say that, although they're pretty generic.

Instructions say:

Red - Switched 12v Power
Black - Power Ground
Green/Black - AEMnet-/CANL (Optional)
White/Black - AEMnet+/CANH (Optional)
Blue - Serial/RS=2323 Output (Optional)
White - 0-5V Analog Output Positive+ (Optional)
Brown - 0-5V Analog Output Negative- (Optional)

I'm usually good at wiring, but I'm just unsure which of the above wires (Excluding Red & Black) splice into the under dash wires?

None of them, on a stock ECU car.

But I'm installing my MSPNP2 at the same time.

Then you'll need to run the white and/or brown wires to the appropriate inputs at the Megasquirt.

So, I can't just splice into the main wires that plug into the MS/ECU? I have to buy that optional cable and wire it up to the MS that way?

You don't have to.... but if you can avoid splicing into your harness anywhere, that's usually advisable. Is there a plug for a secondary auxiliary harness on your Megasquirt? I haven't messed with anything that outdated in a long time.

Yep, there's an "Options" plug, but you have to buy an additional harness and find what wire does what and splice them together. I thought this AFR gauge install was simple and the MS was PNP and that was it... I'm having doubts about this whole thing now...

Additional harness and options plug should have a pin diagram. Play a matching game with 2 wires. This is super simple stuff. :) That said, if this is hard, you're going to have a bad time tuning.

I watched a few of Greg's (CarPassionChannel) YouTube videos of the MS install and they looked simple, but they were also on an NA... I know it's simple and I'm overreacting about the whole thing. I actually don't plan to tinker much with the MS. I'll auto tune it and that may be all I do with it. There's nobody around here that messes with MS, that's why I chose the PNP one.

You're going to need to do way more than autotune it. That's about.... 10% of the actual tuning.

I wouldn't put a Megasquirt on an unopened stock motor NB1, period, personally.

I was just going to install it to my car, then the new engine will be going into it during the Winter. It's definitely not too late to change my build plans. Someone said I could use ITB's on my car without a standalone? Is that true?

Sounds like some crap sjmarcy would post.

If you're planning on making much more than stock power, or changing the motor itself (Or installing ITBs), yes, you need a standalone. No, tuning isn't as easy as hitting the "autotune button."

Thanks a lot!

You should go with something a local tuner supports or see if you can get somebody here to remote tune for you if you don't plan on learning pass autotune.