TPS (throttle position sensor)
#1
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Year: 1998
Model: Cherokee
Engine: 4.0
TPS (throttle position sensor)
I was reading online trying to diagnose my heeps illness and it seems to have all the symptoms cause by a bad tps or tps connector but I cannot figure out how to get a good reading or if I am even trying to read the correct piece since everything I've come across has been different from what I have on my 1998 XJ 4.0 automatic. Can someone explain where to get the volt readings from and some pictures would help. Thank you in advance!
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Year: 1999
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Good source for an inexpensive legal, licensed factory service manual.
http://www.pacificcoastmanuals.com/F..._cherokee.html
http://www.pacificcoastmanuals.com/F..._cherokee.html
#3
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Year: 1996
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Post Renic TPS have 3 leads. Ground, input 5v and output. With the ignition on but engine not running, use a probe into the back of the connector to see which is which. Verify that you have a GOOD GROUND. Verify 5v input, and then check the output. Both of mine tested .76v with the throttle closed and 3.75-3.8V with the throttle wide open. The change needs to be a linear sweep and is best tested with an analog meter vs digital.
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Post Renic TPS have 3 leads. Ground, input 5v and output. With the ignition on but engine not running, use a probe into the back of the connector to see which is which. Verify that you have a GOOD GROUND. Verify 5v input, and then check the output. Both of mine tested .76v with the throttle closed and 3.75-3.8V with the throttle wide open. The change needs to be a linear sweep and is best tested with an analog meter vs digital.
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Year: 1999
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The FSM spec at WOT is "less than 4.49 volts". There is no bottom limit like at idle.
Here's a test procedure if you'd like to go by it. Use a small safety pin as a back probe.
#6
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have you had it scanned? my 97 had the same symptoms. i replaced the tps and no change. ended up being an oxy sensor. try unpluging one of the oxy sensors and see if there is a change. if not, unplug the other. if it stops, then replace the one that you need to. thats how i figured it out. or have a scanner put on it. but, there are a lot of things that can cause that. you can waste a lot of money and time chasing sensors under that hood.
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have you had it scanned? my 97 had the same symptoms. i replaced the tps and no change. ended up being an oxy sensor. try unpluging one of the oxy sensors and see if there is a change. if not, unplug the other. if it stops, then replace the one that you need to. thats how i figured it out. or have a scanner put on it. but, there are a lot of things that can cause that. you can waste a lot of money and time chasing sensors under that hood.
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#8
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Ken thanks for that diagram as well. Mapped everything out perfectly for me. Good electrical diagrams can be tough to track down for certain year vehicles, even when you have the manual for a vehicle.
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