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Author: Subject: "How to" OEM Focus ST170 ecu with Pats info.
big_wasa

posted on 8/9/18 at 10:38 AM Reply With Quote
Is the tacho adjustable for cylinder count ? Due to the wasted spark system of the Ford you have to adjust the cylinder count to compensate.

Pre CAN ecuís had a dedicated tacho out put that I used, but for my new install I am looking at a full can dash with all data coming from the Ecu.

So having swerved your question, you will have to try it and see as I havnt done it. But please let us know in case I change my mind and go the Etb telemetrix again as I did love the classic look.

Cheers

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Pigsy

posted on 8/9/18 at 09:42 PM Reply With Quote
Not adjustable for cylinder count. There are devices out there to do it as well as circuit diagrams to make one, all driven by the coil. watch this space.
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Pigsy

posted on 8/9/18 at 09:49 PM Reply With Quote
https://www.ebay.co.uk/itm/UNIVERSAL-TACH-ADAPTER-CONVERTER-COP-1-2-3-4-5-6-8-10-cyl-to-any-4-6-8-Tach-/141979625888
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Pigsy

posted on 8/9/18 at 09:50 PM Reply With Quote
https://www.petervis.com/electronics%20guides/frequency%20multiplier%202/5v%20to%2012v%20conversion.html
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Pigsy

posted on 14/9/18 at 04:32 PM Reply With Quote
Rough running st170

Hi. My build starts easily BUT runs very poorly and backfires. I have traced all the wires and see no mistakes. Obd2 reader tells me that the o2 sensors have a fault. They are brand new and the wiring is correct. It says the same for the maf sensor. It is also brand new. I noticed that the earth had become dislodged and so reconnected it. It then would not start. I had to disconnect it again. Is there a trick method for doing away with it? It was idling way too fast but is ok now. When I open the Suzuki gsxr750 throttle itbís it wants to stall. Has anyone any suggestions to overcome these problems.

Iím close to removing the itbís and refitting the standard inlet system with its sensors etc as this is proving to be very difficult to do not to mention time consuming. I would rather not as they add horses and sound great. Has anyone seen a blog on an st170 with bike carbs and original ecm/ecu please?

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big_wasa

posted on 14/9/18 at 04:43 PM Reply With Quote
They wonít add any horses due to the mapping.

Multi sensor failure will be a power or earth fault.

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Pigsy

posted on 14/9/18 at 09:39 PM Reply With Quote
Thanks again.
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FamilyGuy

posted on 5/11/18 at 09:43 PM Reply With Quote
Can the temp sensor from the st170 thermostat housing be wired in to an acewell dash unit?

I'm wanting to avoid having to mount an additional sensor in the hose if possible.

Any advice appreciated.

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big_wasa

posted on 6/11/18 at 06:42 AM Reply With Quote
No the Acwell will need its own matched sensor. If its a single wire sensor you will need to work out a way of earthing it if you screw it into a plastic housing.
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FamilyGuy

posted on 6/11/18 at 04:39 PM Reply With Quote
Thanks. I'll just mount the acewell sensor in the hose after the stat.
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ross313

posted on 26/2/19 at 05:37 PM Reply With Quote
hi all just had a read though this massively help full thread

i will be wiring one of these shortly

and just wondering with the key chip reader which wire goes where on the ecu ?

i may have missed it or miss read

any help massively appreciated

thanks

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big_wasa

posted on 26/2/19 at 08:58 PM Reply With Quote
This is the Focus Rs but itís the same as the st170



Cheers

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ross313

posted on 26/2/19 at 10:20 PM Reply With Quote
Thanks Iím sure Iíll be back with more questions
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ross313

posted on 2/3/19 at 04:26 PM Reply With Quote
Hi just doing a st170 loom and on the obd port I done have anything in pin 6 as pictured I have pin 7 tho any ideas

Thanks

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big_wasa

posted on 2/3/19 at 07:51 PM Reply With Quote
You can just move the pin over.
Some plugs from other models donít have Can but will have other functions. Pin 7 is a K line coms port.

To move the pin pull the green plug out the back and release the pin.

Cheers

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big_wasa

posted on 2/3/19 at 07:55 PM Reply With Quote

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ross313

posted on 7/3/19 at 10:22 PM Reply With Quote
Hi all Back again

Just gone to test my wiring set up tonight and get jonflashing led wondering if I have missed a power or a ground have you a list of pins that need to be grounded and powered

Thanks

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big_wasa

posted on 7/3/19 at 11:04 PM Reply With Quote
Non flashing ?

So you should have
five earth wires from the ecu.
One permanent 12v live for the memory.
Two switched lives that go hot with the ignition on.
One wire from the ecu to the earth of the led. Plus perm live.
Two wires from the ecu to the tranciever. Plus power and earth.

The led should be a standard non flashing led ( common mistake to fit a flashing one ) it will need a suitably sized resister ( size depends on colour and other things ).

Make sure the permanent live is first before switching the ignition on ie not all three at once.

In this state it should flash once every couple of seconds.

When the ignition is switched on and the key is in range of the tranciever the led will light solid for two to three seconds before going out. The code is accepted and the engine will start.

With the key out of range it wi flash like the clappers. This is a fault code.


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ross313

posted on 8/3/19 at 04:52 PM Reply With Quote
All sorted was missing the perm live for the memory

Thanks

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big_wasa

posted on 8/3/19 at 09:30 PM Reply With Quote
No problem.
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FamilyGuy

posted on 10/5/19 at 04:37 PM Reply With Quote
I've got my engine running nicely but can't for the life of me get the obd to work. I have wired it as per your diagram but still nothing. Any ideas what could be wrong?
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big_wasa

posted on 10/5/19 at 05:00 PM Reply With Quote
You probaly wouldnít even need the can wires. Just 2+10 the power and two earths.

From memory the two signal wires could be twisted in a helix to cancel interference.

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FamilyGuy

posted on 10/5/19 at 05:04 PM Reply With Quote
I've got the wires twisted and tried it with and without the CAN wires with no joy. I might try a USB reader instead of the cheap bluetooth one, only thing I can think of.
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big_wasa

posted on 10/5/19 at 05:09 PM Reply With Quote
Try and borrow a known working one. One of the very cheap hand helds is ideal.

An old bluefin unit gives a high level of information.

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FamilyGuy

posted on 17/5/19 at 07:01 PM Reply With Quote
I bought a wifi obd reader off Ebay after reading about problems with the bluetooth ones.....and still no use.

Fortunately my neighbour mentioned that he had a diagnostic reader. Plugged it in and it worked a treat. It did find a couple of error codes, one with the MAF and one with O2 sensor circuit. I'll need to look into these over the weekend.

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