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  #31  
Old October 24th, 2019, 08:54
90XJ_Seth's Avatar
90XJ_Seth 90XJ_Seth is offline
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Re: TPS ohm issue, renix 1990 i6 automatic.

Quote:
Originally Posted by cruiser54 View Post
This is called progress. Check ohms at the CTS, IAT...

Imagine if every sensor in the circuit was giving an inaccurate reading due to bad grounds.......
Good that I have a bunch of connectors and extra wire hanging around for just this purpose! Thank you.
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  #32  
Old October 24th, 2019, 10:51
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Re: TPS ohm issue, renix 1990 i6 automatic.

Which wire would be the ground for the IAC?
I will isolate the grounds for each of the connectors as whatever is going on with the dipstick is not properly grounding.
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  #33  
Old October 24th, 2019, 12:08
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Re: TPS ohm issue, renix 1990 i6 automatic.

Advice on how to check the ECU and TCU grounds as they ground at the dipstick which has the grounding issue.
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  #34  
Old October 24th, 2019, 20:34
lawsoncl lawsoncl is offline
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Re: TPS ohm issue, renix 1990 i6 automatic.

Measure resistance between the sensor ground and the engine block. You also might want to unwrap the wiring harness along the firewall and redo the crimped connection where multiple (brown?) ground wires converge, and then go down to the dipstick.
Scroll about halfway down for a picture.
https://www.cherokeeforum.com/f51/cr...x-tips-153657/
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  #35  
Old October 25th, 2019, 09:23
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Re: TPS ohm issue, renix 1990 i6 automatic.

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Originally Posted by lawsoncl View Post
Measure resistance between the sensor ground and the engine block. You also might want to unwrap the wiring harness along the firewall and redo the crimped connection where multiple (brown?) ground wires converge, and then go down to the dipstick.
Scroll about halfway down for a picture.
https://www.cherokeeforum.com/f51/cr...x-tips-153657/
I have done this yes, thank you for the post though!
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  #36  
Old October 26th, 2019, 11:49
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Re: TPS ohm issue, renix 1990 i6 automatic.

Major Update:
A picture truly would've been worth the last thousand words in this thread.
If only I had sent you all a picture you could've told me I was making a huge error in reading my multimeter. I was using the wrong setting to measure the output voltage of the TPS.
You would've caught the error I clearly made and I would've had much of this rectified months ago.

My TPS is outputting .83 volts and honestly probably has been but i was using the wrong reading.

A few updates to my system. I traced down the wire harness and found that it was reading 2.4 ohms all the way to the factory crimps and past that to the left of the grounds. I opened the wire harness further and it still reads 2.4 ohms. I then added a ground directly to the block from the terrible factory crimp and voila .7 ohms all the way to the TPS and MAP so I could reuse those wires if I need to.

Thank you all for your help and especially Cruiser54's website for all the thoughts and suggestions. Now on to muck this thing up again...
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  #37  
Old October 26th, 2019, 16:26
lawsoncl lawsoncl is offline
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Re: TPS ohm issue, renix 1990 i6 automatic.

Quote:
Originally Posted by 90XJ_Seth View Post
Major Update:

A few updates to my system. I traced down the wire harness and found that it was reading 2.4 ohms all the way to the factory crimps and past that to the left of the grounds. I opened the wire harness further and it still reads 2.4 ohms. I then added a ground directly to the block from the terrible factory crimp and voila .7 ohms all the way to the TPS and MAP so I could reuse those wires if I need to.

It's been a while, but I thought one of the brown wires in that crimp went to the ground point by the dipstick. You removed, cleaned, and reinstalled that grounding point, yes?
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  #38  
Old October 26th, 2019, 18:44
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Re: TPS ohm issue, renix 1990 i6 automatic.

Yes I did. And redid it again today. It's finally at the right ohms.
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