Throttle Position Sensor
Throttle Position Sensor
Senior User
Joined: Jun 2003
Posts: 400
Likes: 0
Throttle Position Sensor
it lets the computer know what position the throttle plate is,so it can make necessary adjustments. typically a hesitation or flat spot is felt when you push on the gas pedal.hope this helps.
Post Fiend
Joined: Jan 2003
Posts: 9,748
Likes: 16
From: Connecticut
Throttle Position Sensor
Ford says:
"The TP sensor is mounted on the throttle body. As the TP sensor is rotated by the throttle shaft, four operating conditions are determined by the PCM from the TP. Those conditions are closed throttle (includes idle or deceleration), part throttle (includes cruise or moderate acceleration), wide open throttle (includes maximum acceleration or de-choke on crank), and throttle angle rate."
As you can probably guess based on the above, a bad TPS can show a whole bunch of symptons.....one of the more common I've read about is a wandering idle.
"The TP sensor is mounted on the throttle body. As the TP sensor is rotated by the throttle shaft, four operating conditions are determined by the PCM from the TP. Those conditions are closed throttle (includes idle or deceleration), part throttle (includes cruise or moderate acceleration), wide open throttle (includes maximum acceleration or de-choke on crank), and throttle angle rate."
As you can probably guess based on the above, a bad TPS can show a whole bunch of symptons.....one of the more common I've read about is a wandering idle.
Elder User
Joined: Oct 2001
Posts: 724
Likes: 0
From: Cypress, CA
Throttle Position Sensor
gdoggy:
There is also a test procedure in these threads somewhere. As I recall you should have 5volts input KOEO. At idle, the output should be less than 1 volt and at full throttle around 4.5 volts. The voltage should also increase smoothly and evenly as you work the throttle from idle to wide open - again KOEO. If the output voltage is outside of these ranges, the TPS is suspect.
Hope this helps.
Russ
There is also a test procedure in these threads somewhere. As I recall you should have 5volts input KOEO. At idle, the output should be less than 1 volt and at full throttle around 4.5 volts. The voltage should also increase smoothly and evenly as you work the throttle from idle to wide open - again KOEO. If the output voltage is outside of these ranges, the TPS is suspect.
Hope this helps.
Russ
Senior User
Joined: May 2003
Posts: 161
Likes: 0
From: Spring Hill, KS
Throttle Position Sensor
I have a 94 XLT, 2.3 4Cyl. When my TPS went bad, my idle was no longer an idle. When I started the motor, the throttle ran wide open. Back then I was really poor and not very well educated with all the electronic crap, it took me almost 3 months to get it fixed...Driving down the road I would have to ride the brake just so that I would be running 90Mph. on occasion the idle would wander (slower then usual idle) and occasionally stall. Syptoms for me was just the wide open throttle, spent $14 at Western Auto and it only took less then an hour and it was fixed!
Last edited by Ken00; Jun 20, 2003 at 02:30 PM.
