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Hesitats when driving down the highway - 2004 Kia Optima

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Jan 15, 2008 - 061000 ENGINE AND ENGINE COOLING:ENGINE
THIS BULLETIN PROVIDES INFORMATION RELATING TO AN ENGINE HESITATION OR THE ILLUMINATION OF THE MALFUNCTION INDICATOR LAMP (MIL) FOR P0123 (THROTTLE POSITION SENSOR / SWITCH (A) CIRCUIT HIGH INPUT). *NJ

Try to find it wih your dealer, and reminder that this symptoms may include:

  • Rough idle
  • High idle
  • Surging
  • other symptoms may also be present

Causes: A code like this in the dahsboard may mean that one or more of the following has happened:
  • TPS not mounted securely
  • TPS circuit short to ground or another wire
  • Faulty TPS
  • Damaged computer (PCM)

Possible Solutions:
* If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back. * If there are symptoms such as the engine is stumbling or hesitating, carefully inspect all wiring and connectors that lead to the TPS. More than likely the problem is with the TPS wiring. Check the voltage at the TPS (refer to a service manual for your vehicle for this specific information). If the voltage spikes or is too high (over 4.65 volts with key on, engine off), then that is indicative of a problem. Carefully trace each wire from the TPS wiring harness to check for breaks, rubbing against other components, etc.

Hope helps.

Posted on Sep 06, 2010

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