Hello, im new to the forum, as im putting MS1 V3 in my VW type 4 beetle. I don't have a stim, but im trying to install the ecu now, and i have most of the wiring done. My relay/fuse box is finished along with the power and grounds to the MS ecu. Everytime i switch to ignition the 2A fuse that sends 12v to pin 28, blows out. I dont have the injectors or an idle solenoid wired up, but it seems to be an internal MS problem. With the ecu disconnected the fuse does not pop.
Ive tried switching to all nylon screws on the heatsink, which did nothing.
Alittle bit of backround: Today after problem arised i noticed i accidentally sent power to the fuel pump ground control, pin 37. Also i found that i was missing C22 off the PCB, so i put that on. After sorting out these issues, nothing has changed. Anything else i should try? Any help is appreciated.
Thanks,
Roach
Blowing 2A MS Fuse
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
Re: Blowing 2A MS Fuse
Fault finding without a stim is tricky. I'd say the likely cause is you've made a mistake with the wiring. Easily done. 
A breakout board can be useful too - allows you to disconnect each and every individual feed for testing. You could, of course, simply unsolder every circuit at the D37 apart from the power and grounds then replace one by one until the fuse blows.
A breakout board can be useful too - allows you to disconnect each and every individual feed for testing. You could, of course, simply unsolder every circuit at the D37 apart from the power and grounds then replace one by one until the fuse blows.
Dave P, London UK.
Rover V-8
MSII V3
EDIS
Tech Edge Wideband
Rover V-8
MSII V3
EDIS
Tech Edge Wideband
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roachdogg28
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Re: Blowing 2A MS Fuse
Thanks for the reply,
Ive actually sorted that issue out and found another. The fuse issue was a couple of shorts by over tightening the nylon screws over the mica insulators causing the tabs to bend down and touch the heatsink. After that was corrected, the led came on for a second then went out, which i believe is correct function.
The new issue is using a USB adapter for serial communication. I got my adapter from DIYAutoTune, and ive set the comport, baud, flow, and data bits, installed the driver and ran through hyperlink. I cannot get an echo on hyperlink, and i get no response in Megatune when i test the connection. I will try tinkering with it more tomorrow, but its time to get a little sleep.
Ive actually sorted that issue out and found another. The fuse issue was a couple of shorts by over tightening the nylon screws over the mica insulators causing the tabs to bend down and touch the heatsink. After that was corrected, the led came on for a second then went out, which i believe is correct function.
The new issue is using a USB adapter for serial communication. I got my adapter from DIYAutoTune, and ive set the comport, baud, flow, and data bits, installed the driver and ran through hyperlink. I cannot get an echo on hyperlink, and i get no response in Megatune when i test the connection. I will try tinkering with it more tomorrow, but its time to get a little sleep.