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TomPaint
User
May 19, 2017, 1:54 PM
Post #1 of 32
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1995 Ford F-150 Code 122
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1995 Ford F-150, 5.0 302 auto trans with 145,000 miles
My truck was running rough with the check engine light on and codes 122 and 123 (jumper wire test). I cleaned the throttle body and changed out the throttle position sensor (TPS). The check engine light still comes on, only one code now which is 122. It idles better but has no power when I try to take off. I ran a voltage test from the 3 pins(harness to TPS) to negative terminal on battery with ignition in run position. The pins read: 5V, 32mv, and 32mv. Does anyone know what I should check for?
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Hammer Time
Ultimate Carjunky
/ Moderator
May 19, 2017, 2:32 PM
Post #2 of 32
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Re: 1995 Ford F-150 Code 122
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122 is TPS too low and 123 is TPS too high. Since they are conflicting codes, they cannot happen simultaneously by the same problem so they had to set at different times.
You need to check the wiring and plug pins for any damage or broken wires. If you have a scan tool that reads live data, you could monitor the voltage while wiggling the wires. You can also do that with a digital voltmeter.
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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.
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TomPaint
User
May 19, 2017, 2:41 PM
Post #3 of 32
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Re: 1995 Ford F-150 Code 122
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Do you know what voltage range I need? Is path, 3 pins to computer under dash? All I have is a multimeter.
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Hammer Time
Ultimate Carjunky
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May 19, 2017, 2:53 PM
Post #4 of 32
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Re: 1995 Ford F-150 Code 122
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You should have a constant 5v on the brown/white wire.
Measuring between the Gray/white and the gray/red you should see a gradual changing voltage from a little under 1v up to a little under 5v as the throttle is gradually opened.
Of course this is all with the key on. Don't let the battery go dead.
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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 May 19, 2017, 2:54 PM)
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TomPaint
User
May 19, 2017, 7:34 PM
Post #5 of 32
(7412 views)
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Re: 1995 Ford F-150 Code 122
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Ok , I am getting 5V at brown/white. If I am getting less than .5V from Gray/white to gray/red, should I run (new) grey/white wire to pin 47 of computer and grey red to ground? Or is it a bad TPS?
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Hammer Time
Ultimate Carjunky
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May 19, 2017, 7:35 PM
Post #6 of 32
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Re: 1995 Ford F-150 Code 122
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Did you open the throttle all the way while you were measuring it?
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TomPaint
User
May 20, 2017, 5:46 AM
Post #7 of 32
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Re: 1995 Ford F-150 Code 122
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I do not understand. If I have the TPS disconnected and I am checking voltage from grey/white to grey/red, how can I check a full throttle reading?
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Tom Greenleaf
Ultimate Carjunky
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May 20, 2017, 5:56 AM
Post #8 of 32
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Re: 1995 Ford F-150 Code 122
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You move the throttle by hand at throttle under hood or a helper push the gas pedal. As HT said you are looking for an even sweep of outputs at the specs listed - it's like a dimmer switch for a light in a way,
T
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Hammer Time
Ultimate Carjunky
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May 20, 2017, 6:17 AM
Post #9 of 32
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Re: 1995 Ford F-150 Code 122
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You DON'T check it when disconnected. You back probe the connector with a pin or paper clip while it is plugged in to read return voltage.
As Tom explained. you are looking for a gradual sweep in voltage as 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.
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TomPaint
User
May 20, 2017, 11:53 AM
Post #10 of 32
(7372 views)
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Re: 1995 Ford F-150 Code 122
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Just to be clear: Check it in the run position but not with the engine running, and check voltage by stabbing wires (just to get past insulation) grey/white and grey/red? Check voltage at idle and at full throttle position?
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Hammer Time
Ultimate Carjunky
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May 20, 2017, 12:17 PM
Post #11 of 32
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Re: 1995 Ford F-150 Code 122
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Of course not running. You can't open the throttle all the way with the engine running.
Try not to stab and damage the wires. Insert a pin or paper clip alongside the wire from the back of the plug. it's called back probing.
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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.
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TomPaint
User
May 21, 2017, 5:27 AM
Post #12 of 32
(7347 views)
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Re: 1995 Ford F-150 Code 122
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I am getting zero volts from grey/white to grey/red. I have a open somewhere or bad replacement TPS?
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Hammer Time
Ultimate Carjunky
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May 21, 2017, 5:33 AM
Post #13 of 32
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Re: 1995 Ford F-150 Code 122
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Yes
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Tom Greenleaf
Ultimate Carjunky
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May 21, 2017, 5:38 AM
Post #14 of 32
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Re: 1995 Ford F-150 Code 122
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Sorry to butt in but this seems too difficult and might be totally simple. Does this TPS screw on side of throttle body with two little tabs that are to turn the plastic two little tabs of the removable TPS? That type: You have to put it on properly or it misses the tabs and just sits there. You can feel the spring action on it and turn it to line up screws if not you can't put it on.
That detail it would behave like it wasn't on the vehicle at all and NOT turn nor change output voltages and run like crap. You need to know if that one which does show looking up parts that it's installed properly,
T
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TomPaint
User
May 21, 2017, 8:18 AM
Post #15 of 32
(7323 views)
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Re: 1995 Ford F-150 Code 122
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Yes, an opening in a wire?
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TomPaint
User
May 21, 2017, 8:22 AM
Post #16 of 32
(7313 views)
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Re: 1995 Ford F-150 Code 122
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You mean tabs facing inward? I made sure the circle with the 2 tabs was installed inward. Even if it was not installed properly, shouldn't there be some voltage between grey/white wire and grey/red wire?
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TomPaint
User
May 21, 2017, 8:23 AM
Post #17 of 32
(7310 views)
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Re: 1995 Ford F-150 Code 122
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I still have the old TPS. Any way to test it?
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Hammer Time
Ultimate Carjunky
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May 21, 2017, 8:27 AM
Post #18 of 32
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Re: 1995 Ford F-150 Code 122
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Yes, either one is possible. That's what testing is for.
Personally, I would be more suspect of your testing, that you actually had good contact on both the test leads and the plug attachment to the sensor.
You should have had some sort of reading.
CIRCUIT / WIRE COLOR
TP / gray/white
VREF / brown/white
SIG RTN / gray/red
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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 May 21, 2017, 8:30 AM)
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TomPaint
User
May 21, 2017, 8:37 AM
Post #19 of 32
(7303 views)
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Re: 1995 Ford F-150 Code 122
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I got 33 mV when going from grey/white or grey/red to negative battery terminal. Wouldn't that eliminate the not getting good contact theory?
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Tom Greenleaf
Ultimate Carjunky
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May 21, 2017, 8:39 AM
Post #20 of 32
(7300 views)
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Re: 1995 Ford F-150 Code 122
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This is one common type I'm talking about,
Can you see the two nubs inside top and bottom left?
If this one or type you have to get those nubs on the correct side of the pivot for throttle plate or it does NOTHING. YOU said there's power to it, 5V fine but screwed up or nothing comes out. This has to be turned just a smidge IF THIS TYPE just a tad to catch the nubs properly on metal of throttle shaft or it can't pass voltage thru or worse you can "box" nub to nub and wreck them if tightened with it wrong. Two Phillips head screw I think hold this easy to be stuck.
If not this type at all forget this. This part shows for exactly your vehicle. Others you might be asked what color the nub turning thing was inside no longer?
Tom
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TomPaint
User
May 21, 2017, 9:08 AM
Post #21 of 32
(7289 views)
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Re: 1995 Ford F-150 Code 122
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That is the type and the 2 nubs are facing inward. Are you saying I can install it the correct way inward but still put the tabs on the wrong side of what needs to turn them?
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Hammer Time
Ultimate Carjunky
/ Moderator
May 21, 2017, 9:18 AM
Post #22 of 32
(7283 views)
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Re: 1995 Ford F-150 Code 122
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No, that does not eliminate anything. You should be seeing no less than 500 to 600ma at idle. Check for the 5v reference voltage again.
The position of the sensor doesn't matter at the moment because it should never read 0, even if it isn't even attached to the throttle body.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.
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TomPaint
User
May 21, 2017, 9:27 AM
Post #23 of 32
(7278 views)
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Re: 1995 Ford F-150 Code 122
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I checked brown/white pin to negative battery terminal and I was getting 5 volts.
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Hammer Time
Ultimate Carjunky
/ Moderator
May 21, 2017, 9:30 AM
Post #24 of 32
(7272 views)
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Re: 1995 Ford F-150 Code 122
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Try measuring all 3 to battery ground.
This would be a whole lot easier using a scan tool.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.
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TomPaint
User
May 21, 2017, 9:31 AM
Post #25 of 32
(7269 views)
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Re: 1995 Ford F-150 Code 122
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I checked the 5V pin first and got 5V, then I reconnected the TPS and checked grey/white to grey/red and got no reading. I than check grey/write to ground and got 33mv and grey/red to ground and got 33mv.
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