Possible turbo issue

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Dec 10, 2013 | 01:00 PM

#106

Bullitt390

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Quote:

Originally Posted by FordTruckEnthusaist

Sorry, what is the ref.?

PCM sends a 5 volt reference to the sensor and expects a certain voltage back.

Josh

Dec 10, 2013 | 01:06 PM

#107

FordTruckEnthusaist

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Alright, well I won't have access to that fancy scan tool for a while as tomorrow is my last day of class for the semester. So how does one do this with a DMM?

Dec 10, 2013 | 02:49 PM

#108

npccpartsman

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From: Stuttgart, Ar

Quote:

Originally Posted by FordTruckEnthusaist

Alright, well I won't have access to that fancy scan tool for a while as tomorrow is my last day of class for the semester. So how does one do this with a DMM?

Take the sensor connector off, ground one end of the DMM and probe the three plugs inside the connector with the key on. You should get 5V in one of them. IIRC it's the "odd man" inside the connector (two of them are side by side).

Dec 10, 2013 | 02:59 PM

#109

FordTruckEnthusaist

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Quote:

Originally Posted by npccpartsman

Okay I'll give that a shot tomorrow. Voltmeter just on regular 12V right?
Sure do appreciate y'all's help, this thread may be 87 pages long by the end of it but I'm going to figure out what's wrong haha.

Dec 10, 2013 | 03:04 PM

#110

Bullitt390

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Easier to leave the connector connected to the sensor and Backprobe each wire with KOEO.

You're looking for the 5 volt vref and the return signal to the PCM

Josh

Dec 10, 2013 | 03:31 PM

#111

FordTruckEnthusaist

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Would you have to pull out all the wires to do that? Or can you just cut the shrink tubing open enough to get a probe to touch wire?

Dec 10, 2013 | 04:24 PM

#112

Bullitt390

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Quote:

Originally Posted by FordTruckEnthusaist

Would you have to pull out all the wires to do that? Or can you just cut the shrink tubing open enough to get a probe to touch wire?

Use a pushpin to insert into the back of the connector. Do not cut the insulation.

Josh

Dec 10, 2013 | 04:35 PM

#113

Rusty Axlerod

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From: L.A. (Lower Alabama)

Here is a nice wiring diagram:
https://www.ford-trucks.com/ford-man...%20diagram.pdf

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Dec 10, 2013 | 05:17 PM

#114

FordTruckEnthusaist

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Quote:

Originally Posted by Rusty Axlerod

Here is a nice wiring diagram: https://www.ford-trucks.com/ford-man...%20diagram.pdf

Holy ****.

So you can't just pull the connector out of the sensor, flip it upside down and test the 3 pins? I thoughts that what you were talking about earlier but now I'm confused haha.

Dec 10, 2013 | 08:38 PM

#115

npccpartsman

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From: Stuttgart, Ar

Quote:

Originally Posted by FordTruckEnthusaist

Holy ****.

So you can't just pull the connector out of the sensor, flip it upside down and test the 3 pins? I thoughts that what you were talking about earlier but now I'm confused haha.

That's a good diagram to store on your computer. It's not extremely specific AFA wire colors go but it will help you go a long way with diagnostics and how things work with each other in a general sort of way.

You can disconnect it at the sensor but their may be a reason for testing it connected to the sensor. That I don't know.....

Dec 10, 2013 | 08:50 PM

#116

Bullitt390

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Quote:

Originally Posted by npccpartsman

You can disconnect it at the sensor but their may be a reason for testing it connected to the sensor. That I don't know.....

With the connector disconnected you only have the 5 volt vref. Back probing with sensor connected verifies the 5 volt reference and also the sensor signal to the PCM.

If you have those two things, it shows:

1) the sensor works
2) the problem lies between the sensor output and PCM.

Which means start chasing the harness for chafing or breaks/corrosion.

Not to throw salt in the wounds, but for the 8 pages it's taken to do this would take about 15 minutes with a competent mechanic in the field.

Josh

Dec 10, 2013 | 10:44 PM

#117

FordTruckEnthusaist

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Well good thing I'm not a mechanic making money off this then I guess. I just don't always understand things completely by reading it, I have to physically see it and do it. Not just related to mechanical, I just have to actually do it for it to click and I'm not about to pay somebody to do something that I can figure out haha