Throttle Position Sensor (TPS) over voltage - Defender Source
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  #1  
Old May 7th, 2012, 09:16 AM
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Jason England
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Throttle Position Sensor (TPS) over voltage

My throttle position sensor is reading consistently 0.57 volts at idle .... this is above the auto claibrate range for a TPS.

I removed the TPS from the plenum and it still has the same reading ... I hoped it would fall to zero ( or close anyway )

I bought a brand new genuine replacement, plugged it in and have exactly the same symptoms.

I was thinking bad connection, but this would introduce resistance, and that would lower the voltage.

Looking for suggestions?
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  #2  
Old May 8th, 2012, 08:11 PM
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Ethan
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Have you checked the tps readings at the ECM? If you suspect a bad connection, try unplugging the computer and checking the readings at the connector, so you can rule out high resistance and poor connections between the tps and computer. I've heard that the GEMS ECM has a memory as far as adaptive settings go, disconnecting the battery isn't enough. Once the battery is disconnected, connect tge positive and negative leads together for a minute or two, then reconnect and try again. What symptoms are you trying to resolve? Have you checked the basics such as timing?
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Old May 9th, 2012, 03:50 PM
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Jason England
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So I have a tool to read the actual values from the ECU ... The connection isnt bad ... the votage is too high ... equates to 13% which is the limp home value.

It seems like the eCU is substituting a value at the lower end of the range and my tester indicates limp home mode. The truck is perfectly driveable but seems to over fuel ... fuel economy could be better though.

I'll try the ECU clear method to try and do a total reset.

I'm just wondering if something else is causing the ECU to substitute a value??
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #4  
Old May 17th, 2012, 07:55 AM
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Neil
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I am new to the forum, but have read some great info. I was wondering if you were having the same symptoms I am having due a bad TPS.

I have a 95 Defender 90 and over the last month have had intermittent power issues. It seems to take place after the truck has been driven for 15-20 minutes. Between 1st and 2nd gear as well as 2nd and 3rd, it feels as if the engine shuts down and then picks right back up again. I hear no unusual noises and get no check engine light errors. Usually after this takes place, I sit and idle for a few minutes and rev the engine and the truck will shut off. But it starts right back up.

Thanks in Advance.

Neil
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Old May 17th, 2012, 08:00 AM
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Jason England
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doesn't sound like a TPS ... does it throw a code on the reader under the passenger seat?

Check all your air hoses are tight ... especially the plenum one.
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #6  
Old May 17th, 2012, 08:13 AM
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Neil
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I need to check. I have noticed that I have steadily gotten worse gas mileage over the last few months and then it started with the problems I mentioned, so it could be an issue with the plenum hose. I will also look into the error code.

I will let you know what I find out.

Thanks.
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  #7  
Old May 17th, 2012, 08:48 AM
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Jason England
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fuel issues and air issues go hand in hand
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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