Tps to high?

[Scott Banner]

I have my tps set for .42 idle and 5.0 WOT. Is it possible to have it set to high at WOT and if so what problems would it cause? Thanks for the help.

 

[Scott231]

If the voltage ever goes above 5.00, you will set a TPS-Too High trouble code. There are a few things that can go wrong with certain chips...but there is no specific detriment as long as 5.00 is not exceeded.

 

[Mr URL]

http://www.gnttype.org/maint/malf.html#21

CODE 21

Trouble Code 21 indicates that the Throttle Position Sensor (TPS) is reading abnormally high. TPS volts should be close to 0.42 V at closed throttle and rise smoothly in about 0.02 volt increments to a maximum reading of about 4.85 volts at WOT.

The conditions for setting this code are:

the engine is running, and
Code 33 or 34 (MAF error) is not set, and
TPS reading is > 4.90 volts
- or -
TPS reading stays between 2.5 and 4.9 volts, and
MAF reading is < 15 grams/second, and
the above two conditions are present for more than 5 seconds

Note: During a Code 21 condition, the ECM uses a default TPS value of 2.6 volts. This will cause the engine to idle very high.


Typical causes for this code include:

1) Defective TPS
2) Short circuit in the TPS harness to +5 volt reference
3) Open sensor ground circuit
4) Defective ECM

I like to adjust them for .42 and 4.60v.