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Old 04-22-2019, 10:34 PM   #31
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Bummer, I was hoping you would find the fault with that test.

Guess Road-1 is back in play.

I gotta go, -drama with my daughter. I will put my thinking cap back-on, and post back tmr after work.
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Old 04-23-2019, 04:13 PM   #32
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Marde,

I think I found the problem! Paul suggested that a bad sensor was draining the voltage from the PCM that was trying to put out 5v but couldn't due to a sensor short of some kind and that I should monitor Vref voltage while disconnecting all Vref sensors. I did this and after 7 or so sensors got to the power steering pressure switch near the pump. When I unplugged this sensor Vref jumped from 0.7v to 5.2V!!! I am on my way to Autozone to get a new pressure switch/sensor.

I will confirm here that the problem is fixed or not tomorrow when I know for sure.

Many thanks for your's and Paul's help. Teamwork paid off I think.

Thanks, Mike
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Old 04-23-2019, 09:13 PM   #33
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Wow! Fantastic news!

I just saw those other old threads you un-earthed today. During this journey, I forgot to search for similar-subject threads. Whoops. I really had my blinders on, especially by only looking at the single page wire diagram we were using. Big lesson learned.

Very very glad that Paul got re-engaged.

One person (from 2014) even spelled it out, nearly spoon fed the problem to us.

Quote:
Originally Posted by eightsixstud View Post
The information I found for P0642 - Sensor Reference Voltage 'A' Circuit Low

Possible causes:
- Faulty Engine Control Module (ECM)
- ECM harness is open or shorted
- ECM circuit poor electrical connection
- Shorted sensor on 5 volt circuit
Congrats on the find & the fix.
Cheers!
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Old 04-23-2019, 09:44 PM   #34
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Quote:
Originally Posted by [email protected] View Post
Marde,

I think I found the problem! Paul suggested that a bad sensor was draining the voltage from the PCM that was trying to put out 5v but couldn't due to a sensor short of some kind and that I should monitor Vref voltage while disconnecting all Vref sensors. I did this and after 7 or so sensors got to the power steering pressure switch near the pump. When I unplugged this sensor Vref jumped from 0.7v to 5.2V!!! I am on my way to Autozone to get a new pressure switch/sensor.

I will confirm here that the problem is fixed or not tomorrow when I know for sure.

Many thanks for your's and Paul's help. Teamwork paid off I think.

Thanks, Mike


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Old 04-24-2019, 09:48 PM   #35
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Well the good news is the car now runs great and the CEL stays off. I think it will pass emissions now.

The bad news is the IMRC still is not acting quite right. On initial engine start the flaps cycle from open to closed to back to open, stay there for a few seconds then close again and stay there as the engine idles. All this seems right. However after I drive someplace and without turning the engine off, open the hood and check the flap position they are open and I believe they should be closed at idle. At this time if I ground the vacuum solenoid the flaps close and will stay closed as long as i keep the manual grounding. Seems like I still have an issue but it doesn't seen to trigger the CEL. Can probably drive it this way for another year and it will have 255,000 on it by then so probably ready for the junk yard anyhow. Thanks for all the help forum contributors. Mike
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Old 04-29-2019, 02:54 AM   #36
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Hello Mike,

Sorry to hear that you have IMRC problems still OR again after the prior PCM 5-Volt low voltage problem & fix via "power steering pressure switch" replacement.

I see you have a new thread, so I will reply in the new thread, and not in this older thread. I recommend that other people should reply to you in your new thread located here->

https://www.focusfanatics.com/forum/...operation.html
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