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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


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Old 07-16-2019, 09:33 PM   #1
kev0
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Where is the DI Ecu located?

Can someone post a picture of where this is located?
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Old 07-16-2019, 10:16 PM   #2
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On passenger side of engine near valve cover. Large black box with harness.
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Old 07-16-2019, 10:17 PM   #3
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On the passenger side above the injectors
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Old 07-16-2019, 10:47 PM   #4
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So this one, right? I read that the bottom bolt can cause grounding issues and I'm going to try and see if that will rule out my issues. It looks really tight...how can I even screw the bolt down there? Would I need to jack my engine up? :x
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Old 07-16-2019, 11:05 PM   #5
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That's it. If you can see the 3rd bottom bolt going into the block and it's tight, your ECU is grounded. What are your issues?
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Old 07-16-2019, 11:41 PM   #6
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That's it. If you can see the 3rd bottom bolt going into the block and it's tight, your ECU is grounded. What are your issues?
Got a lean code (P0171). Fuel trims are actually pretty high so it could very well actually be lean. Was just trying to rule out a possibility.

Thanks!
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Old 07-17-2019, 03:31 AM   #7
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Got a lean code (P0171). Fuel trims are actually pretty high so it could very well actually be lean. Was just trying to rule out a possibility.

Thanks!

Alternativly you can run a ground wire to chassis ground from the top bolt
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Old 07-17-2019, 01:24 PM   #8
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Got a lean code (P0171). Fuel trims are actually pretty high so it could very well actually be lean. Was just trying to rule out a possibility.

Thanks!
I got this too. Turns out the aftermarket in-tank fuel pump was not seated properly, dropping feed pressure to 38 psi. The DT flex fuel kit I have saw an out of limit low pressure and zeroed out the ethanol content signal to the ECU, making it think I had 100% gasoline instead of the e85 I actually had. It then was running leaner than it should have been, my STFTs pegged at 30%.
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