What are the possible causes of the p0121 code?
What are the Possible Causes of the P0121 Code? 1 Defective throttle position sensor 2 Fault in the TP sensor circuit 3 Problem with the throttle body 4 Problems with other sensors (e.g., MAP and MAF sensors) 5 Issues with the control module (e.g., software in need of update) 6 Faulty APP sensor 7 Fault in the APP circuit
What is the error code for throttle position sensor?
If the module detects that the sensor is operating outside of a predetermined range, error code P0121 will be set. A throttle position sensor operating outside of a predetermined range can trigger code P0121.
What is the return voltage of the TP sensor?
There are three wires attached to the TPS: power, ground and signal. Power, or reference voltage, goes into the TPS. The sensor then sends a return signal voltage to the PCM. The return voltage depends on throttle positon. Typically, the signal value at idle will be about .45 volts.
How is the TP sensor used in the PCM?
The PCM uses data from the TP sensor when calculating functions, such as idle speed, fuel delivery, and automatic transmission shift points. Also, on vehicles that have ETC, the PCM (or another control module) uses data from the TP sensors as a primary input for control of the throttle motor/throttle blade.
What are the Possible Causes of the P0121 Code? 1 Defective throttle position sensor 2 Fault in the TP sensor circuit 3 Problem with the throttle body 4 Problems with other sensors (e.g., MAP and MAF sensors) 5 Issues with the control module (e.g., software in need of update) 6 Faulty APP sensor 7 Fault in the APP circuit
What does a Volkswagen p0121 throttle position sensor mean?
A code P0121 Volkswagen 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
If the module detects that the sensor is operating outside of a predetermined range, error code P0121 will be set. A throttle position sensor operating outside of a predetermined range can trigger code P0121.
There are three wires attached to the TPS: power, ground and signal. Power, or reference voltage, goes into the TPS. The sensor then sends a return signal voltage to the PCM. The return voltage depends on throttle positon. Typically, the signal value at idle will be about .45 volts.
Why is my VW p0121 throttle position sensor not working?
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.