tinwelp Posted Sunday at 02:26 PM Report Share Posted Sunday at 02:26 PM Hello people, I'm tidying up a few wiring issues inherited from previous owners and I've hit an issue without an obvious solution. Can anyone tell me what the MIL wire from PIN22 on the ECU is supposed to do? It's currently connected in a very nonsensical way and I'd like to understand how it should be connected. Does anyone have specific knowledge? I've a loom with the six pin diagnostics connector and the easystart system if it helps. Failing that, does anyone know what happens to pin 22 in the cases of a fault and no fault? Thanks in advance. Cheers... Paul Quote Link to comment Share on other sites More sharing options...
konrad Posted Sunday at 03:09 PM Report Share Posted Sunday at 03:09 PM From my notes... There is a symbol on the initial 2011 wiring diagram called "Testigo Averia". That translates as “Fault Witness”. I called it the CEL (Check Engine Light) in my notebook. Another name is the MIL (Malfunction Indicator Lamp). Looks like OSSA made it part of an instrument panel in the 2014 wiring diagram. Reverse engineered it a bit. It sources 5 volts at only 5 mA, so not too useful to drive a lamp. Even an LED is pretty dim. But, you could easily read it with a voltmeter. If your bike does not start, see if ECU pin 22 is at 5 volts (with the bike powered by a battery). This would indicate the ECU thinks there is a problem, versus the bike just being recalcitrant. Wiring diagrams are here: https://www.ossa-efi.com/home/electrics/wiring-diagrams Quote Link to comment Share on other sites More sharing options...
tinwelp Posted Sunday at 03:39 PM Author Report Share Posted Sunday at 03:39 PM Excellent! Thank you konrad. OK, I can drive a suitable transistor with that to turn on the "spare" warning light on the OE dashboard. Am I correct to assume the 5V is relative to the ECU ground on PIN10? It seems almost as if the ECU manufacturer didn't finish the job, or tried to save a bit of cost by removing the internal MIL lamp driver. Thanks again. Cheers... Paul Quote Link to comment Share on other sites More sharing options...
tinwelp Posted Sunday at 04:06 PM Author Report Share Posted Sunday at 04:06 PM This should work with a high impedance input from PIN22. I'll build it in the coming days and see if it is a viable solution. Cheers... Paul Quote Link to comment Share on other sites More sharing options...
konrad Posted Sunday at 07:51 PM Report Share Posted Sunday at 07:51 PM (edited) 6 hours ago, tinwelp said: Am I correct to assume the 5V is relative to the ECU ground on PIN10? Yes, but I would advise caution. Pin 22 is driven by a component (Rohm SP8K22 dual N-channel MOSFET) known to have failed on at least 3 Explorers. This renders the ECU useless. I don't know of any trials model to which this has happened. I assume there is something about the Explorer wiring harness/easy start that's causing the failure, but I don't have one to investigate. Edited Sunday at 09:46 PM by konrad spelling Quote Link to comment Share on other sites More sharing options...
konrad Posted Sunday at 10:07 PM Report Share Posted Sunday at 10:07 PM 5 hours ago, tinwelp said: This should work with a high impedance input from PIN22. I'll build it in the coming days and see if it is a viable solution. Cheers... Paul May I ask where you got that design? Was it done by an A.I. chatbot? Quote Link to comment Share on other sites More sharing options...
tinwelp Posted Monday at 05:45 AM Author Report Share Posted Monday at 05:45 AM I hear you. It's very much not important, so if the risk is high, it's off my list of stuff to do. The design came from my son... he claimed to have designed it, but I'll ask. Looking at it now with a more critical eye, I see several errors and issues, so probably best to junk it and start over. Cheers... Paul Quote Link to comment Share on other sites More sharing options...
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