P75 ecu bridged resistors

s300 and SManager software questions & answers
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Hermanmax88
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P75 ecu bridged resistors

Post by Hermanmax88 » Fri Oct 04, 2019 10:11 am

I was soldering in boost control components on my p75 ecu when i noticed on the backside of the board, in the same area as q20 there were two components/4 legs sloppily bridged/soldered all together. Is it supposed to be like this?

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Spunkster
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Re: P75 ecu bridged resistors

Post by Spunkster » Fri Oct 04, 2019 10:50 am

Post a picture of what you are referring to.

Hermanmax88
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Re: P75 ecu bridged resistors

Post by Hermanmax88 » Fri Oct 04, 2019 4:16 pm

So unfortunately I already Desoldered it before I thought that it might be like that for a reason but in the attached picture the screwdriver is pointing to q23 and dm10, all 6 legs were connected in a sloppy puddle of solder before I Desoldered it. The ecu worked fine like that also. My p28 ecu is not like that, is it a non vtec ecu thing maybe?
DF85CBEC-7FDA-42BB-B728-77C6260E1E12.jpeg
DF85CBEC-7FDA-42BB-B728-77C6260E1E12.jpeg (3.7 MiB) Viewed 393 times

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Spunkster
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Re: P75 ecu bridged resistors

Post by Spunkster » Fri Oct 04, 2019 4:59 pm

It sounds like it should not have been that way.

Hermanmax88
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Re: P75 ecu bridged resistors

Post by Hermanmax88 » Sun Oct 06, 2019 2:55 pm

Can you suggest a good place to tap the switched 12v source for the boost solenoid. I am already using the one for the radio for my wideband and the one for the cigarette lighter for my water meth controller. Is there another one you would suggest using?

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Re: P75 ecu bridged resistors

Post by Spunkster » Mon Oct 07, 2019 10:42 am

You should not use the radio as a source for power. Use the empty spots in the under dash fuse box as there should be 1 or 2 that are switched with the ignition switch.

Hermanmax88
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Re: P75 ecu bridged resistors

Post by Hermanmax88 » Mon Oct 07, 2019 11:20 am

I dont have it ran off of the actual radio, the radio is uninstalled and im using the switched 12v wire that was for the radio. Are you saying I shouldn’t use that wire? If not, what is the reason?

DaX
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Re: P75 ecu bridged resistors

Post by DaX » Wed Oct 09, 2019 1:33 pm

I would recommend running a fuse sub-panel to provide power to all the accessories you're adding (gauges, wideband, boost solenoid, etc.). I'm using a 6 circuit panel and a relay to control when it is powered. This way each gauge, the wideband, and the boost solenoid all have their own fuse that is the correct size.

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