Reasons for Throttle Pedal Signal 1 and 2 Rationality Fault?

[MaverickAnn]

Possible causes of the fault: Based on the fault symptoms, the unresponsiveness to throttle input is caused by the fault code P213564, indicating a rationality fault between throttle pedal signal 1 and throttle pedal signal 2. Troubleshooting process: 1. Data reading: The engine data stream was read to analyze the voltage difference between throttle pedal signal 1 and throttle pedal signal 2. It was found that the throttle pedal signal voltage was normal. 2. Accelerator pedal: The signal voltage of accelerator pedal 1 was 0.8V, and the signal voltage of the accelerator pedal was 0.4V, maintaining a proportional relationship, which is normal. However, the ECU reported a fault code that could not be erased. 3. Throttle input: Attempts were made to synchronize the changes of the two signals through pedal throttle input, maintaining the proportional relationship, but the fault code still could not be erased. The inability to erase the fault code means the vehicle cannot be handed over to the customer, necessitating a thorough investigation of this fault point. 4. Disconnecting the pedal connector: The pedal connector was disconnected to measure the pin voltage. The power supply of 5V, signal lines, and ground lines all showed no abnormalities. Replacing the throttle pedal did not resolve the issue.

[SadieFitz]

I frequently deal with automotive electronic system failures, especially issues with throttle pedal signals. The so-called Signal 1 and 2 rationality fault occurs when the engine control unit (ECU) detects inconsistent readings from the two pedal position sensors—for example, one indicates 50% depression while the other shows 30%, leading the ECU to flag an error due to the discrepancy. Common causes include: first, sensor damage such as internal wear or moisture corrosion; second, wiring issues like aged cables, loose connectors, or short circuits that cause signal deviations; third, mechanical problems like improper pedal installation or jamming; and finally, ECU software faults or unstable voltage. Such faults can lead to unstable acceleration or even engine stalling, posing serious risks. I’ve found that regular checks to ensure the pedal area is clean and avoiding deep-water driving can effectively prevent these issues. It’s advisable to have the sensors tested with a diagnostic tool at a reputable shop every six months. Remember, safety comes first—don’t attempt DIY fixes recklessly.

[LeBrayden]

As a veteran driver with twenty years of experience, I've personally encountered the frustration of throttle pedal signal failure. That time on the highway, when I pressed the accelerator, the car suddenly jerked, and the dashboard lights flashed, indicating signals 1 and 2 were unreasonable. The causes usually fall into several categories: the two sensors don't match, possibly because one is faulty or there's poor contact in the signal wires; sometimes dirt or debris jamming the pedal can also cause misreading; worse yet, the ECU module might malfunction and make inaccurate judgments. I was so scared that I immediately pulled over, popped the hood, and found the pedal wiring was loose. Later, replacing the new sensor fixed the issue. In daily driving, it's important to avoid severe jolts that could damage the circuits and to develop a habit of regular maintenance, especially checking the pedal area—don't wait until a major problem arises. This fault affects acceleration response, and delaying repairs increases the risk of accidents.

[JaxsonDella]

From my technical perspective, the rationality fault of throttle pedal signals 1 and 2 stems from the failure of the sensor system's dual verification mechanism. Every modern vehicle is equipped with two position sensors to ensure reliability, and the ECU will trigger an error if the signal difference exceeds the threshold. The primary causes include: 1) physical damage to the sensors, such as potentiometer wear; 2) circuit issues like unstable power supply voltage, poor grounding, or wire interference; 3) environmental factors such as high temperature and humidity accelerating oxidation; and 4) software logic errors. In practical operations, I would first use a multimeter to check if the resistance values match, replacing the component if the discrepancy is significant. For prevention, maintaining a dry and clean engine compartment and upgrading the ECU firmware can help reduce such issues, as driving safety should never be overlooked.

[Maximus]

As an ordinary car owner, I am most concerned about throttle failure endangering my family's safety. Signal 1 and 2 unreasonably indicate contradictory readings from two sensors, triggering the ECU to disable the throttle as a warning. Common causes include: sensor aging or malfunction, chewed or corroded wiring, foreign objects jamming the pedal, or ECU misjudgment. That day when I was picking up my child from school, the car suddenly lost power, which was terrifying. The mechanic said this type of failure is prone to occur in humid environments and recommended checking the wiring in the pedal area before each rainy season. When driving normally, avoid stomping on the pedal too hard and improper modifications. If left unrepaired, it may lead to a breakdown on the road, causing delays and danger. Everyone should pay more attention to their car maintenance records to prevent problems before they occur.

[Scarlett]

As a DIY car enthusiast, I've dealt with throttle signal faults several times. The rationality error between Signal 1 and 2 means the two sensors are out of sync, causing the ECU to limit throttle for safety. The main cause is sensor failure, such as worn carbon brushes or moisture damage; secondary causes include circuit shorts, open circuits, or poor connector contact; occasionally, it's due to pedal mechanism deformation. Diagnosis is straightforward: connect an OBD scanner to check error codes and confirm inconsistent values; replacing the sensor or cleaning the connectors usually solves it. Preventive measures include keeping the garage dry and avoiding water splashing into the engine bay. This issue affects driving smoothness, and early checks can save money and safety risks. Remember to disconnect power when working for safety.