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ford code 122 repair


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budahrox
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Sep 15, 2009, 7:04 PM

Post #1 of 16 (5902 views)
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ford code 122 repair Sign In

Hello all
1992 Bronco 5L
400,000K
Error code 122 Low voltage @ TPS
My question is how to repair????
We had a bunch of different faults but can't seem to shake this one.
Have replaced the TPS & EGR sensor
Gas engine so TPS apparently not adjustable.
Any tips would be much appreciated.
Thanks in advance!!
Cheers!!!


Hammer Time
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Sep 15, 2009, 7:11 PM

Post #2 of 16 (5895 views)
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You have to physically measure the voltage in and out of the TPS to determine where the problem lies.

What engine does it have?




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budahrox
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Sep 15, 2009, 7:13 PM

Post #3 of 16 (5889 views)
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Its a 5L
Measuring the voltage will help determine where the problem lies????
Cheers!
Don


Hammer Time
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Sep 15, 2009, 7:23 PM

Post #4 of 16 (5881 views)
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Unplug the sensor with the key on and measure the voltage between the gray with red wire and the brown with white wire and you should have 5 volts.

If that is OK plug it back in and measure between the gray with red and the gray with white and you should have between .5v and .75v at idle. As you slowly open the throttle, the reading should slowly increase to just under 5v at Wide open throttle.

Let me know what you find.




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



budahrox
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Sep 15, 2009, 7:30 PM

Post #5 of 16 (5873 views)
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Will do. Have to find a multi meter so might take a bit but I will return.
Appreciate the help very much.
Back in a while.
Thanks again! Smile
Cheers!!


budahrox
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Sep 16, 2009, 12:47 PM

Post #6 of 16 (5861 views)
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Hi there
Sorry for not getting back last night but couldn't get my meter back from my buddy. Will have it after work tonight & will post my findings. Easy to understand how to test the circuit when the connectors are apart, but what is the best method to test when they're closed??? Blush
Thanks & regards,
Cheers!!


Hammer Time
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Sep 16, 2009, 12:52 PM

Post #7 of 16 (5856 views)
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Use a paper clip or needle to backprobe the plug.




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



budahrox
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Sep 16, 2009, 1:00 PM

Post #8 of 16 (5852 views)
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Cool Thanks for the tip!
Will post the readings later on.
Cheers!!


Sidom
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Sep 16, 2009, 11:00 PM

Post #9 of 16 (5845 views)
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A little shot of carb clean on the backside of the connector will help the probe slide in. I tried di-electric grease which lets the probe slide in real easy. the problem I had were my leads were too heavy & would pull the probe out if I moved my scope.






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budahrox
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Sep 17, 2009, 10:06 PM

Post #10 of 16 (5832 views)
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Wow that was kinda brutal. Thought I was losing my mind & not able to get readings on the 2nd test.
Finally got it & this is what I got.

With the harness disconnected I got the 5.01V across the designated wires
With the harness reconnected I get 2.1mV across the designated wires & no change when opening up the throttle.
??????
Cheers!!


Hammer Time
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Sep 18, 2009, 5:29 AM

Post #11 of 16 (5819 views)
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You were measuring different wires when it was plugged in, right?

If you did that right it's indicating a bad TPS.

Try one more test
With it plugged in, repeat the second test but instead of using the gray with red, use the battery ground and see if you get any different results.




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



budahrox
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Sep 18, 2009, 10:11 AM

Post #12 of 16 (5815 views)
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Hmmmmm
Ok will try that. I did measure across the other 2 wires on the 2nd test. It's also a brand new TPS on there right now. I guess it could just be a bad one. When I 1st started this venture I had several different codes to deal with. Replaced the EGR sensor & the TPS. Got rid of everything else but this 122 code. Before starting this repair, there is an adjustment screw on the throttle that had been adjusted out to open the throttle flaps more & run smoother/idle better @ low end. Should I have backed that off again before installing the new TPS???? Or would the new TPS compensate for that. With the new TPS installed I had to open it a bit more in order to keep the motor running. Now I get a hard shift between 1st & 2nd, the motor runs fairly smooth & the tach seems out of whack by approx 500 RPM compared to the previous set up.
Cheers!


Hammer Time
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Sep 18, 2009, 12:23 PM

Post #13 of 16 (5812 views)
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I'm suspecting that you either damaged that TPS when you put it on or it's installed wrong.




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budahrox
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Sep 18, 2009, 1:11 PM

Post #14 of 16 (5808 views)
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Do you think I should try taking it off & then backing the adjustment screw til it comes back around to fitting the TPS again???
Cheers!!


Hammer Time
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Sep 18, 2009, 2:10 PM

Post #15 of 16 (5804 views)
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The base idle is a whole different adjustment and there is a procedure for that but it should not effect the TPS installation. There is a set of cogs that have to line up correctly with the TPS so it can rotate it. If the cogs are on the wrong position, it will just break when the throttle is opened.




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on Sep 18, 2009, 2:15 PM)


budahrox
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Oct 8, 2009, 12:22 PM

Post #16 of 16 (5740 views)
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Sorry, been away a while.
Figured out my TPS problem
Thanks all for the help.
Much appreciated.
Cheers!




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