Check Engine Light - Limp Mode - After S300 Installation

[AKlass]

After the installation of my Hondata, the Check Engine Light (CEL) appears and the the car goes into Limp Mode.

I have a stock 1994 Acura Integra LS w/ the original B18B engine. I have checked the forums and have followed the instructions but am still having problems.

After installation of the SManager Software onto my laptop and plugging the ECU w/ the S300 into the car, I installed the drivers and successfully uploaded the Stock P74 Calibration.

However, when I started the car, it immediately went into Limp Mode and displayed the CEL. Therefore I turned off the car and tried to diagnose the ECU Error Code by shorting the blue connector on the passenger side, but it only displayed a solid Check Engine Light.

-- S300 and Laptop Communication --
Then I wanted to make sure that my laptop was communicating with the S300. So I changed a few settings (rev limiter, shift light, etc.) and reloaded it into the S300. I switched the ignition off, closed the SManager, switched the ignition back on, opened the SManager, and was able to download the exact calibration from the ECU that I had uploaded.
Therefore I know that my laptop is properly communicating with the S300.

-- S300 Lights --
I also read on the forums about the S300 lights so I checked those as well. When I turn the ignition on, there is a constant red light at D2. This never changes unless I am uploading or downloading, in which case a green light blinks at D1.

-- Datalogging --
Even though I my car will only operate in Limp Mode with the CEL on, I tried datalogging. None of the values changes in my SManager.

-- Check P74 ECU --
I removed the S300 and cut J1 to check if my P74 had a problem. The car immediately returned to it's stock configuration when the ignition was switched on and engine started. The CEL was all gone at this point.

-- Re-Install J1 and Check all installed components --
I then checked that all the components have been soldered in correctly and they were. Although I am not a trained Hondata Technician, I am an Electrical Engineer and know my way around a breadboard (circuit board).

-- Software Update and Last Check --
Once J1 and the S300 was reinstalled, I also downloaded the SManager version from the Hondata site (I had previously used the version from the CD-Rom). I also reinstalled the USB Drivers (which I don't think the problem is because the S300 communicates properly with the laptop). Finally, after all of this, I got the same results as my original attempt. Nothing but a CHECK ENGINE LIGHT and Limp Mode.

-- Notes --
- I did not install R54 because there is none on the P75 (obd1 B18b).
- I installed the supplied jumper on J1 instead of just a plain wire.
- The car is completely stock other than an RSR Ex-Mag exhaust and Short Ram Intake.
- S300 was purchased because I was planning on installing a custom turbo setup next week.

-Location: Maryland.
-Car: 1994 Acura Integra LS (obd1 P75 Ecu)
-Engine Type: B18B
-ECU #: 37820 - P75 - A01
-S300 Serial Number: S300-0152

Any and all help I get will be greatly appreciated.

Thanks!

[B18c1turboedeg]

I had the same problem after spending 3HRs on dyno and 375!!! Hondata said too send them the ECu..

[Spunkster]

You will need to send the ecu and s300 to us for testing. In all cases what we have found is that the s300 board has not been seated properly on the pins or is shifted left or right and not catchign all the pins.

All s300's are tested and in working condition before being sent out.

Please include all your contact details and a detailed note describing the problem.

[gezzuzz3]

im having same problem

[TurboLS]

I'm having a similar problem, although my s300 is not being detected in windows. It gets detected as an unknown USB device, which led me to believe that I screwed up the ECU somehow. So I took everything off and put the J12 back in and fired her up with no problem. If the seating of the Hondata unit itself is a big issue, maybe i will just get another stock ECU as an extra and see if I can get the s300 unit seated properly. The only software issue I could think of was if Hondata required USB 2.0