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Old 12-21-2016, 12:31 PM   #1 (permalink)
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TPS problem

Hi guys

I have the Next problem. At full gas TPS signal reading by ECU is 83% and not 100%. Is it normal? Is it not calibrated? If this is right . How it can be calibrated?.

Regard.
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Old 12-21-2016, 01:03 PM   #2 (permalink)
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Totally normal. I think mine reads 88%.
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Old 12-21-2016, 05:27 PM   #3 (permalink)
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Totally normal. I think mine reads 88%.
Hi Robotech , but these situación is not perjuditial to car performance ?, because the information to ECU is not real in special when the car has RACING ECU reprogram ?
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Old 12-21-2016, 05:58 PM   #4 (permalink)
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I'm not totally sure how the sensor detects 88% throttle position when you're at 100% pedal travel but what I do know is the throttle position is never more than 90% Ergo the 80-something% = 100% throttle.

In the ECM, when you look at throttle setting parameters, the value for a throttle at 80%, 90% and 100% are the same. Thus the ECM treats 80-something% throttle the same as 100% throttle.

People who make tunes for our cars know this and thus their tunes reflect this 80-something% throttle issue. In the Radio Control Car world we call this End-point adjustment. We turn the steering wheel 100% to the right but the servo only moves 80% of it's available travel to the right because that's as far as it can move. 0% is still in the middle and 50% steering wheel travel would equal 40% of the servo's available travel. It's all still proportionate. (Of course we can change that too with RC Cars but that's not important.)

So what I THINK is going on is something similar (and maybe @davhamm or @Tomato Soup can comment on this) in that even though our throttle pedal position sensor is saying 100% throttle, the throttle position sensor on the throttle body is saying 80-something% of it's possible travel yet that is the maximum our throttle body can open in relation to the sensor's range and thus the tune is written accordingly.
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Old 12-21-2016, 06:23 PM   #5 (permalink)
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I'm not totally sure how the sensor detects 88% throttle position when you're at 100% pedal travel but what I do know is the throttle position is never more than 90% Ergo the 80-something% = 100% throttle.

In the ECM, when you look at throttle setting parameters, the value for a throttle at 80%, 90% and 100% are the same. Thus the ECM treats 80-something% throttle the same as 100% throttle.

People who make tunes for our cars know this and thus their tunes reflect this 80-something% throttle issue. In the Radio Control Car world we call this End-point adjustment. We turn the steering wheel 100% to the right but the servo only moves 80% of it's available travel to the right because that's as far as it can move. 0% is still in the middle and 50% steering wheel travel would equal 40% of the servo's available travel. It's all still proportionate. (Of course we can change that too with RC Cars but that's not important.)

So what I THINK is going on is something similar (and maybe @davhamm or @Tomato Soup can comment on this) in that even though our throttle pedal position sensor is saying 100% throttle, the throttle position sensor on the throttle body is saying 80-something% of it's possible travel yet that is the maximum our throttle body can open in relation to the sensor's range and thus the tune is written accordingly.
Thanks , great information , thanks again !
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Old 12-21-2016, 06:26 PM   #6 (permalink)
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Glad to help. Like I said, I'm not totally positive on why the system works the way it does, I just have been told this is...in very basic terms...how it does it.
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