Lumina L4-151 2.5L (1991)
Throttle Position Sensor: Adjustments
TPS Adjustment Check
The Throttle Position Sensor (TPS) is not adjustable. The normal closed throttle position voltage is below 1.33 volts, and normal wide open throttle
position voltage is approximately 5.0 volts. If these limits are not in specification, check for freedom of throttle movement, and accelerator pedal
interference from carpets and other obstructions. If the problem is not corrected, replace the TPS.
The ECM has the ability to self zero the TPS voltage if it is below approximately 1.33 volts. A TPS voltage that does not fall within 0.33 volts and 1.33
volts should be replaced after checking connections.
