2G random wire in ecu

[donniegst]

Anyone got a idea what this wire is for

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[motomattx]

I would say it switches the maps on the eprom.

 

[donniegst]

I bought the car as a basket case could it be for the gm maf it came with?

 

[steve]

The implementation is a bit of a hack job. As motomattx said it's for switching between versions of software in that EPROM.

That wire is switching Address Bit 12 on the EPROM between a 1 and 0. Since it's the highest order address bit on that chip, it's selecting the code in one half of it of the other.

You'll have to read out the EPROM to know exactly what's different between the two images in the chip to see if it's a E85/Gas tune setup or two different tunes for the same fuel.

 

[donniegst]

Ok thanks

 

[donniegst]

So what should I do with the wires?

 

[steve]

Depends on what your going to do with that ECU.

 

[donniegst]

Putting it in the car till I can save up for link

 

[steve]

Does your car have the same mods as the one the ECU is from? That chip is for a specific setup.

 

[donniegst]

Same injectors same fuel pump.......besides that no it had a stock 7 bolt with a ebay 20g......... my motor is a 4gcs 6bolt with a small 16g

 

[steve]

OK.
I can't tell you which image on the chip is going to be the "correct" one but leaving the wire dangling selects one and grounding the wire selects the other.

 

[donniegst]

Ok sounds easy

 

[donniegst]

Do u think hooking it up to a toggle switch would be smart

 

[lasershark]

You would have to know what the actual tune is that grounding the wire would switch between as Steve suggested. Not knowing is kinda like crossing your fingers and hoping...

 

[steve]

Do u think hooking it up to a toggle switch would be smart

That's typically how it's done. You connect the wire to one terminal of the switch and connect the other terminal to a ground. Then you can choose between the two unknown tunes.

When you decide on DSMLink send the ECU in to have that stuff removed and get a better socket installed.

 

[donniegst]

What risk are involved with using the Ecu on start up