need to fix a bad p72 obd1 i bought... solid code 16

does anyone know how i can supply 12v to the ecu i want to check voltage on the injector driver.

i know they sell a tester but i dont have $200

 

This is a tough one. I would like to do this myself. Let me know if you figure anything out.

 

for sure

 

Without a simulator I don't know how you would accomplish what you are trying to do. And honestly, if you have to ask how to power it up I would be worried you will do more damage than good. All you need are the common power and grounds hooked up but I don't know what you think that will accomplish without a simulator. I could understand if you had something like an S300 but even still that isn't going to get you far.

 

Thanks,No need to be worried here... i know its possible just thought someone that knew would help out..
my theory: 12v to ecu read the voltage on the injector driver (all the components) and make sure the numbers match to what they are suppose to be.

if anything ill just plug it in my car.. i just dont want to go through the hassle of removing my ecu 2x or 3 to do it ....

 

would this work

12v to ecu on PIN A25 (maybe D1 aswell)

Ground to ecu on PIN A23 PIN A24 and PIN B1

power supply: 12 v wall charger adapter... might need a diode aswell

 

Wont the injector drivers show no voltage unless theyre stimulated to fire the injectors? Thats part of the reason why they make simulator boards

 

Winner winner chicken dinner!

 

Good point :/ unless i send the same "stimulating" voltage to the injector pins on A1,2,3,5.....too many wires to run..
so ill have to test with it running.. thats going to be hard.. engine dies after 2 sec...
Found this on google i think its made by a user here. I guess it is tested while it was connected to a running engine

http://www.hackedecu.com/wp-content/...-Testing-1.pdf

 

You wouldn't be sending any voltage to the injector pins. Those are ground by the driver. Unfortunately you are in WAY over your head on this project. Send it out and have it done professionally. Messing with ECU circuitry is not for the beginner especially when you don't understand the basics of how the board works.

 

I offered to fix it for him, but he declined.

 

no hard feelings man and i appreciate the offer,its just that i just paid for a bad ecu and i dont have the cash to have someone else fix it. i have a spare ecu im scraping for qm1 qm2 q22... parts

 

It's all good. Did you buy the ecu locally or?

 

I was going to but i couldnt find any in San Diego, thought id give someone here the benefit of the doubt.. And well as you can see There was no benefit :/

 

Why not file a claim with paypal(assuming that is how you payed) and get you money back.

 

made the mistake of sending it as family (i had to pay the paypal fee) :/ wont happen again thats for sure

 

Not sure it will be useful here but a desktop computer power supply produces a level 12v and most PSUs have ample overhead to power any car part.

 

Yeah, but in his case the issue was he wanted to stimulate the injector drivers with no sensor input.

 

Agreed it's not the solution in this case. Just throwing it out there for anyone who stumbles across this thread and needs 12v for something else.

 

I used to use a spare pc power supply to test my car radio setup. Hooked it all up to make sure everything was wired correctly.

 

That would come in handy! My rig for testing my HID retrofit is a pc with a +/- pigtail coming off a 4-pin power molex.