Toyota Repair Problems? Ask a Mechanic for Answers ASAP
Is this 4.7 engine?
Also was there a check engine light associated with this condition, if so do you have the ability to connect with computer and retrieve code numbers?
When replacing/installing the TPS, you have to make sure that the tangs on the end of the two arms on the throttle assembly are engaged with the slots on the backside of the sensor unit. To do this, make sure the throttle plate is closed, then install it at about 15 degrees to the right of its actual installed position, rotate it counter-clockwise until it touches the throttle shaft. Then install the two mounting screws lightly, i.e just tight enough to hold the sensor in position.
You'll then need a scan tool that tells you throttle position percentage. Turn the the ignition switch to ON. While reading the throttle valve opening % on the scan tool, turn the TPS slowly back and forth until you reach the standard range (between 14.6 and 16%), then set the mounting screws tightly.
Also attached is diagnostics for throttle related codes, although you don't have any codes this information may be helpful in determining if TPS is operating correctly.
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If the TPS sensor "electrically fails" then the check engine light would come on and one or more of the codes in the sheet I attached previously would appear. Other then that the TPS can also be misaligned or voltage values out of range from actual position, This will not cause a code but will trick the vehicle into thinking that it is lets say at 25% throttle when in actuality it is at 45% throttle. This will cause issues because the vehicle is expecting a certain amount of air to pass through the throttle at 25% and therefore matches the amount of fuel needed, but if it thinks its at 25% but its actually at 45% it will cause incorrect air/fuel ratio.