Question about 2005 Toyota Corolla

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Engine runs well, but won't accellerate.

2005 Toyota Corolla. We get code #: P0121 referring to the Throttle Position Sensor. The car starts fine, but it has no power. The engine is the 1ZZFE62.

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  • markseeangel May 17, 2009

    Now I am being told that the car is a "Fly-by-wire" throttle and it has no position sensor. So, now I feel like I am back to the drawing board.

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Replace the throttle positions sensor. it tells the computer how to mix the air fuel ratio. when this is not working the comupter dont know what to do to the enigne to give it power.

Posted on May 17, 2009

  • James Huber
    James Huber May 17, 2009

    Replace the throttle positions sensor. it tells the computer how to mix the air fuel ratio. when this is not working the comupter dont know what to do to the enigne to give it power.

  • ben schoeman Jul 25, 2013

    thank you will try tomorrow let you know

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2003 sta fe hyundai give code 121


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P0121 generic throttle/pedal position sensor a circuit range/ performance


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The Throttle position sensor is a potentiometer that measures the amount of throttle opening. As the throttle is opened, the reading (measured in volts) goes up. The powertrain control module (PCM) supplies a 5 Volt reference signal to the throttle position sensor (TPS) and usually a ground also. A general measurement is: at idle = .5 Volts; full throttle = 4.5 Volts. If the PCM detects that the throttle angle is greater or less than it should be for a specific RPM, it will set this code.

Potential Symptoms: Symptoms of a P0121 trouble code could include:
Malfunction Indicator Lamp (MIL) illumination (Check Engine Light or Service Engine Soon light)
Intermittent stumble on acceleration or deceleration
Blows black smoke on acceleration
No start

Causes: A code P0121 may mean that one or more of the following has happened:
TPS has intermittent open or short internally
Harness is rubbing and causing an open or short in the wiring
Bad connection at the TPS
Bad PCM (less likely)
Water or corrosion in connector or sensor

Possible Solutions:
1. If you have access to a scan tool, see what the idle and WOT (wide open throttle) readings are for the TPS. Check if they're close to the specifications mentioned above. If not, then replace the TPS and re-check.
2. Check for an intermittent open or short in the TPS signal. To do that, you can't use a scan tool. You'll need an oscilliscope. The reason is because scan tools take samplings of many different readings over just one or two data lines and can miss an intermittent drop out. Hook up your oscilliscope and watch the signal. It should sweep up and down smoothly with no drop outs or spikes.
3. If no problems were noticed, perform a wiggle test. Do this by wiggling the connector and harness while watching the pattern. Does it drop out? If so, replace TPS and re-check.
4. If you have no TPS signal, check for 5 Volt reference at the connector. If it's present, check the ground circuit for open or shorts.
5. Make sure the signal circuit isn't 12V. It should never have battery voltage. If it does, trace circuit for short to voltage and repair.
6. Look for any water in the connector and replace TPS as necessary.

Other TPS sensor and circuit related DTCs: P0120, P0122, P0123, P0124

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