If the code keeps comming back then you would first find the wire that goes from the tps to the computer. check for the five volt reference voltage, at the computer and at the tps and then check to see if the return voltage is also at the computer. ( this wire sometimes breaks)
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code p 0121 has to answers
1--refers to throttle position (TP) sensor/accelerator pedal position sensor A--range /performance problem====causes --accelerator cable adjustment--TP/APP sensor ---wiring
The second reference is the same and the causes are--accelerator cable adjustment--TP/APP switch
(APP is accelerator pedal position)
The reduced power light is pertaining to the TAC - electronic throttle control . Is the check engine light lit ? If not still may have a DTC -diagnostic trouble code stored . You probably have a bad TPS - throttle position sensor .
Throttle Body Assembly
The throttle body for the throttle actuator control (TAC) system is similar to a conventional throttle body with several exceptions. One exception being the use of a motor to control the throttle position instead of a mechanical cable. Another exception is the throttle position (TP) sensor. The TP sensor is mounted in the throttle body assembly. The TP sensor is 2 individual TP sensors within the throttle body assembly. Two separate signal, low reference, and 5-volt reference circuits are used to connect the TP sensors and the powertrain control module (PCM). TP sensor 2 signal voltage increases as the throttle opens. TP sensor 1 signal voltage decreases as the throttle opens.
Hi there:DTC P1779 - Engine Torque Delivered to TCM Signal Engine torque signal below lower limit delivered to TCM. I've read these occur when there is a communication problem between ECM and TCM (Transmission Control Module). DTC P1791 - Transmission Control Module LoopThe P1779 and P1791 codes set as a result of the other DTC (P0128). When the ECM sets certain trouble codes, these codes will set in the TCM (Transmission Control Module). The TCM will also increase tranmission pressures, which results in the harsh shifting.
DTC P0123 - Throttle/Pedal Position Sensor/Switch "A" Circuit HighTP sensor signal circuit is shorted to sensor ground.TP sensor signal circuit is open (except 1996-1998 models).TP sensor VREF circuit is open between sensor and PCM.TP sensor is damaged or it failed (it may be shorted).
DTC P0222 - Throttle/Pedal Position Sensor/Switch "B" Circuit LowThe Throttle control module contains two throttle position (TP) sensors with a common 5 volt supply, a common ground, and two independent signal circuits that vary resistance according to changes in throttle plate position. The ECM measures the signal voltage from each TP sensor, which is a reduced value of the ECM 5 volt reference. As the throttle plate opens from 0% throttle to wide open throttle, the voltage on the TP sensor 1 signal increases from 0.6 (+/-0.2) volts to 4.3 (+/-0.2) volts, while the voltage on the TP sensor 2 signal decreases from 4.4 (+/-0.2) volts to 0.76 (+/-0.2) volts. If both P0122 and P0222 are set, circuit 486 may be either open or shorted to ground. Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.
P2138 is Throttle Pedal Position Sensor/ Switch D / E Voltage Correlation. Replace the Throttle Pedal Position Sensor/Switch.Remember to have the set code Cleared from the cars computer, this will turn off the check engine light and reset it. Good Luck and have a good XMASS.
I think the terms "Throttle Positon Sensor", TPS and "Throttle Body" can be misleading at least in regards to the 04 Camry.
My 04 Camry gave a diagnostic reading of P2121 for my problem "Throttle PEDAL position switch D circuit". However, we changed out the complete Throttle Body/TPS (Toyota Part #22030-0H020) that did NOT fix problem.
The 04 Camry TPS Electronic Module "Throttle Positon Sensor" is factory assembled and riveted to the side of the throttle body. The only way to service/inspect it would be to cut off or drill out the rivets. Not sure you could open the darn thing if you got it off, but that seems to be the only way Toyota sells them!!
Hopefully a new Throttle PEDAL Position Sensor (Toyota Part # 78010-33010 PEDAL ASSY, ACC) will fix it. This is located under the dash near the accelerator pedal.
So, now I would recommend FIRST to replace the "Throttle PEDAL Positon Sensor" (it is much, much cheaper) and then the Throttle Body/TPS assembly!! Unless of course, you get a diagnostic code as you did for "faulty throttle body!!
P0122 - Throttle Position (TP) Sensor Circuit Low Voltage P0123 - Throttle Position (TP) Sensor Circuit High Voltage without checking it 1st I would guess the TPS is most likely defective. P0432 - Catalyst System Low Efficiency Bank 2, you may have to replace the Catalytic convertor, it may be worn out, A WORD OF CAUTION: Don't use aftermarket cats, they tend to reset the same code due to compatibility issues, also replace the cat monitor sensor (looks like an O2 sensor) located just to the rear of the bank 2 cat converter.