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ef tps voltage 

 

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 Post subject: ef tps voltage
Posted: Fri Mar 07, 2008 10:30 am 
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What voltage is the tps set at? the motor is an ef six.Thanks

 

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Posted: Fri Mar 07, 2008 10:34 am 
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between 0.55 and 0.85 at ignition on, and idle. Should read 4+ volts at full throttle

i keep mine at 0.84. Make sure you earth the multimeter at the negative wire in the tps sensor plug as it will distort the readings if you use the motor or chassis as earth. Also make sure the reading is the same when the ignition is on and the car running
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Posted: Fri Mar 07, 2008 10:45 am 
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so you set it with the ignition switched on but the car not running?Whoops my bad i didnt read it properly.Thanks for that info

 

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Posted: Fri Mar 07, 2008 11:54 am 
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green car wrote:
so you set it with the ignition switched on but the car not running?


shouldnt matter, voltage reading should stay the same....... if not then check wiring for possible leaks
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Posted: Fri Mar 07, 2008 12:09 pm 
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what happens if you dont set it right...what are the symptoms

 

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Posted: Fri Mar 07, 2008 12:13 pm 
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gogetta wrote:
what happens if you dont set it right...what are the symptoms


the ecu see's part throttle all the time if its set too high.

or if its set too low, it will be unresponsive at light throttle i guess
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Posted: Fri Mar 07, 2008 12:32 pm 
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Why keep the TPS voltage at idle so high?

As the engine heats up, the voltage will get higher. So will generally overstep that .85v threshold.

Best just to set it to around .7v, and it will always be within the idle range.
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Posted: Fri Mar 07, 2008 12:38 pm 
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doesnt really answer why its so important

 

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Posted: Fri Mar 07, 2008 12:52 pm 
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Cos it tells the ECU when to enter idle mode. So fueling and ISC operation.

It also provide shift point information for the ECU. Bad TPS information can cause harsh shifts and thumping kickdowns.
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Posted: Fri Mar 07, 2008 1:03 pm 
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hmm interesting...

arm can u explain why the voltage changes as the engine heats up??

also how do u test teh voltage at the tps and not the ecu

 

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Posted: Fri Mar 07, 2008 1:11 pm 
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Like any resistor, when it gets hot, the resistance typically changes and the voltage changes in proportion. Which is why, I assume, Ford recommend .7v with +/- .15v as the idle tolerance.

As for testing the TPS, stick the multimetre pins in the back of the plug and measure.
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Posted: Fri Mar 07, 2008 1:15 pm 
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i checked the voltage on the middle pin of the tps plug (green/black wire) and it was .72V at closed and about 4.3v full throttle

 

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Posted: Fri Mar 07, 2008 1:19 pm 
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Sounds perfect to me.
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