Stock TPS is still connected since i dont of an aftermarket one installed. Make sure it’s plugged into the port that it’s trying to read. We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon. When done, turn off power, re-install CPU and re-install case. If you don’t know how to do this, here are directions for getting into the Device Manager for XP and Vista. If you do experience problems during loading firmware, there are additional tests to try. If you have a question, comment, or suggestion for this FAQ please post it on the forum.

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When done, turn off power, re-install CPU and re-install case. In this case it was COM1.

This test is performed on the serial plug, not possible if your Megasquirt has USB plug only. Sure you’ve downloaded the correct drivers for windows? Send a private message to Bond. This will bring up the Computer Management screen. CPU megaquirt serial loopback test. If you have a question, comment, or suggestion for this FAQ please post it on the forum. Originally Posted by Reverant. Miata Turbo Forum – Boost cars, acquire cats. No part of this manual may be reproduced or changed without written permission from James Murray, Ken Culver and Philip Ringwood.


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I had issues with my serial-to-USB-adapter until I downloaded it, and then it worked like a charm. Select the port as above i. So before you get into a panic, go through steps here to establish the correct COM port, then load the firmware to your MS2. Type a capital ‘S’ and you cpm see a signature string returned in the lower window as shown here. If it has not, try the cable and CPU socket loopback tests.

If you are using a USB-serial cable then ensure you have installed the drivers if required before plugging in the cable for the first time. Find More Posts by Reverant.

Megasquirt Support Forum (MSEXTRA)

Whatever you type into the top window should appear in the lower window. Before starting the instructions, a word of advice.

Use this COM port number when setting up your tuning software. If test A fails, there is no point in trying the other tests. Usually the best solution to the driver problem is to unplug the cable, uninstall the driver and then re-install the driver.

Find More Posts by Coj Hopefully that should be sufficient to get you connected. If test A fails then you have a serial driver or configuration problem on your computer – consult the documentation that came with the computer or cable.


In this case it is normal for TunerStudio to report no connection and for the firmware loopback tests to fail.

USB & WiFi Support |

If that is ok, there might be something wrong on the Megasquirt end of things – perhaps you made an assembly error with the MAX ST chip or associated capacitors – xom for poor soldering or bridged traces.

Open Device Manager on your computer. So im not sure where im going wrong but whenever i go to test my serial port the test fails. The following errors occurred with your submission.

Select the Device Manager from the list at the left. Getting correct serial communications megasquirh your computer and Megasquirt is critical to enable tuning.

Ensuring there are no shorts underneath the board, re-connect your serial cable and apply power. Open an existing project or if necessary, create a new project. For the two windows 7 machines i used the following adapters: