2003 jeep tj 4L ... 5V reference
- Jerry McGillis
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I have checked the speed sensor 5.12V . Cam sensor 5.11V .. Map sensor 5.12V. but when i do the TPS sensor .5.66V ??
Cant get the light to go away. have deleted it and it just will not go off ?
Any suggestions as to where to look next will help .
Tks
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- chief eaglebear
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- Jerry McGillis
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kinda new at this sort of stuff . never got into all this electronic crap !!!!!
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- Jerry McGillis
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The easiest way to test for this would be to disconnect the clockspring harness and recheck for voltages at the TPS. From the diagram, you can either disconnect the clockspring itself, or at C107.
The other way would be to find the speed control pin at the PCM and remove it from the connector, or cut it in a repairable location. Again, recheck your readings afterwards. If the TPS circuit goes back to normal, you can be pretty certain you need a clockspring.
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- Jerry McGillis
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when i checked the wires one may have had 5.12V wile the other was 5.66V ???
none the less, i have read that the clock spring can change the readings but no one has ever said how it ties in to the TPS sensor .
will try to check this all out tomorrow and post what i find .
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As for your TPS readings, I'm guessing you saw 5ish volts on the 5V reference wire, and 5.6ish on the signal wire. Let me know if you find otherwise.
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- Jerry McGillis
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- Jerry McGillis
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First thing to do a little backtracking, checked the TPS wires again so I know the readings before going to far, sure enough one is 5.11V, that is what I suspected, the other one was 5.66V.
Took a shot in the dark and pulled the fuse for the horn, this changed the 5.66V to 5.06V,
Could it be that simple ?? I don’t think so, after all it is a Jeep!!!!
Put the fuse back in and the 5.06V jumps back to 5.66V.
Removed the fuse, sensor goes back to 5.06V, tried to remove the code, no luck, no mater what you do the engine light won’t go off, fuse goes back in and on to the clock spring.
Open the steering column, unplug the clock spring, and there we have it 5.06V at the TPS sensor.
Now to delete the code, code erased, now the check engine light is gone, the old girl runs fine.
It appears the clock spring is the problem??
Before I get a new one, do any of you guys think I miss anything?
Thanks for all the help with this, a special Thanks to Tyler for pointing me in the right direction, pointing out how the clock spring does have a connection with the TPS.
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Just curious, which fuse did you remove, specifically? Wanted to go see what the connection is on the wiring diagram.
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- Jerry McGillis
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jeep not equipped with cruse , but figured the horn & air bags were the only ones going through the clock spring .
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- Jerry McGillis
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local suppler not having much finding one, but a jeep place i deal with said they can get one from a suppler but may take some time, their good as long as you are not in a rush.
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"Ground cannot be checked with a 10mm socket"
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- Jerry McGillis
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Thanks to every one for the help, would never have found this with out the help.
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