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I have this Camshaft Synchronizer on my EFI converted old 289:it came with this connector:
the problem is that I don't know and can't find any info at least understandable to me on which wire is which of the two black ones from the connector. I've found this picture where it says that one wire should be ground and the other the signal:
Also found these pictures that I unfortunately can't translate into which wire is which:
Anyone who knows or can help?
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I went through making one of these work for my Megasquirt. I believe the short answer is it doesn't matter as it is a VR sensor and I *think* swapping the polarity only changes it to falling edge or rising edge.
What EFI are you running?
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I'm running (or at least going to run) something called a MaxxECU MaxxECU RACE wirings.indb
I was suspecting that it might be as simple as you say, let's see what the others might have to say.
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Raymond_B wrote:
I went through making one of these work for my Megasquirt. I believe the short answer is it doesn't matter as it is a VR sensor and I *think* swapping the polarity only changes it to falling edge or rising edge.
What EFI are you running?
I was kinda thinking the same. Maybe a positive pulse verses a negative one. Signal so small it couldn't do damage it it's backwards. Did you try and ohm the 2 pins on the cam shaft synchronizer to see if one is grounded?
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Nos681 wrote:
2001 Explorer 5.0L cam position sensor.
If you can find the factory pinout for this ECM, the color code may help determine which is signal and ground.
Thanks a lot!
That hopefully solved the problem as it says below that the DB/O that I assume means "darkblue/orange" wire is the signal wire:
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Take a look at 91-gray/red signal return
Ford may have used a signal return to ECM for the “ground”.
Might be able to verify in schematics or wiring diagrams.
The 92 Mustang harness used gray/red for signal return to ECM.
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Signal Return may be a good call, Dan. Looking at one of those pix, it appears to be a red trace on that greyish wire which would correspond to GY/R for Sig Ret. Normally Ford did not ground sensors except through Signal Return.
Last edited by Bullet Bob (1/05/2023 5:30 PM)
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Correct, signal return is also known as sensor ground. You want all your sensors to ground at the ECU to minimize voltage offset.
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Many thanks! That also explains why my MaxxECU has all these "sensor ground" connections available in the harness that came with it.
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Hakan wrote:
I'm running (or at least going to run) something called a MaxxECU MaxxECU RACE wirings.indb
and here's the wiring diagram for the version I have:
I was suspecting that it might be as simple as you say, let's see what the others might have to say.
I meant to say, if you have room in your budget for their PDM you should definitely get it. You'll get your money back in greatly simplified wiring and amazing control of the whole system.
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Raymond_B wrote:
I meant to say, if you have room in your budget for their PDM you should definitely get it. You'll get your money back in greatly simplified wiring and amazing control of the whole system.
Yes, I've heard of it and looked at it. But I had already made a kind of "old school" complete wiring system when I was made aware of its existence.
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