To work correctly, the MEMS unit needs to know the resistance value of the TPS when the throttle is closed and throughout the throttle's travel. These values are usually factory set, but if you replace the throttle body/TPS or adjust the throttle cable they will need to be re-set. This can also help if you suffer from strange idle issues such as a very fast idle or a an uneven idle speed.
To re-set the TPS' operating range, follow this procedure:
- Check the throttle is closing fully and that the throttle cable is correctly adjusted (just a smidge of play in the cable)
Turn the ignition to position 2 (oil pressure/engine management lights on, but engine not running)
Press the throttle pedal smoothly to the floor and release, repeat 10 times
Start the engine