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Check engine light - Innovate MTX-L

 
Old 02-25-2017, 02:41 PM
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Default Check engine light - Innovate MTX-L

So I just installed an Innovate Wideband in my car because I'm about to switch over to megasquirt. Currently the stock ecu is still in the car, so I wired the brown narrowband signal to the factory plug. The car is an 05 1.8 so the o2 sensor has 4 wires. I spliced the brown narrowband to the blue wire on the plug and plugged it back in the car. The wideband works perfectly and displays the afr, but I get a check engine light P2507 (ECM/PCM Power input low. If anyone knows what I can do to get rid of the code I would greatly appreciate it.
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Old 02-25-2017, 04:15 PM
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Ok, well apparently the "room" fuse was busted, which gave me that CEL. But now, I am getting P0031, which is telling me that the Heater for the O2 sensor is faulty. As you guys know, the Innovate has it's own heater circuit. So the factory O2 Sensor heater wires are taped up currently not being used. Have any of you guys experienced this? Or know a way to fix it?
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Old 02-25-2017, 04:58 PM
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My approach was to pay $20 to local muffler shop to add a bung for the Innovate. Continued running the full stock system, but had the wideband and gauge to learn what the stock system did.

Success, but no info on heater wires

So, calling shuiend to discuss what he did to prevent the heater issue.

EDIT: This is the search entry I used to find info on your subject, better than searching directly in the forum: Google in this format, "site:miataturbo.net innovate narrow band"

Last edited by DNMakinson; 02-25-2017 at 05:22 PM. Reason: Removed SPACE between "site:" and "miata..."
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Old 02-25-2017, 05:13 PM
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Originally Posted by DNMakinson View Post
My approach was to pay $20 to local muffler shop to add a bung for the Innovate. Continued running the full stock system, but had the wideband and gauge to learn what the stock system did.

Success, but no info on heater wires

So, calling shuiend to discuss what he did to prevent the heater issue.

EDIT: This is the search entry I used to find info on your subject, better than searching directly in the forum: Google in this format, "site: miataturbo.net innovate narrow band"
I did find this on Miata.net but I'm still confused about what is said to be done.
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Old 02-28-2017, 03:26 PM
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The ECU needs to think the heater in the o2 sensor in working. Joe Perez posted an image previously from the FSM that showed the front o2 heater resistance is 5.6 ohms.
Wiring a 6 ohm resistor across the clipped heater wires should satisfy the ECU. Keep in mind that will draw about 2 amps so the resistor will need to dissipate at least 24 watts.

Edit: the 5.6 ohms was for nb2, don't know if others the same.

​​​​

Last edited by eddyc49; 02-28-2017 at 03:31 PM. Reason: Added info
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Old 02-28-2017, 03:33 PM
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Originally Posted by eddyc49 View Post
The ECU needs to think the heater in the o2 sensor in working. Joe Perez posted an image previously from the FSM that showed the front o2 heater resistance is 5.6 ohms.
Wiring a 6 ohm resistor across the clipped heater wires should satisfy the ECU. Keep in mind that will draw about 2 amps so the resistor will need to dissipate at least 24 watts.

Edit: the 5.6 ohms was for nb2, don't know if others the same.

​​​​
So this should work? And from what I have researched, the heater circuit is the two black wires, correct?
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Old 03-19-2017, 01:43 PM
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Originally Posted by Blayton View Post
So this should work? And from what I have researched, the heater circuit is the two black wires, correct?
For anyone reading this thread with the same problem I had, the 6 ohm 25W resistor did not solve the problem. I just dealt with it until my Megasquirt came in.
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Old 03-20-2017, 10:33 AM
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That's really disappointing. I was going to try that once my motor is back in (for science). I still might to see if there isn't some difference in result.
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Old 01-29-2018, 02:22 AM
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Default Wiring

I believe that both black wires are grounds. So I think the resistor should be between the white and black wires. I'll try it for science. And to get this CEL to turn off.
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