What is the rationality fault of throttle pedal 1 and throttle pedal 2 signals?
2 Answers
According to the fault symptom analysis, the unresponsive throttle is caused by the fault code P213564, which indicates a rationality fault between throttle pedal 1 and throttle pedal 2 signals. Here is the relevant information: Data reading: Read the engine data stream and analyze the voltage difference between throttle pedal 1 signal and throttle pedal 2 signal. It was found that the throttle pedal signal voltage is normal. Accelerator pedal: The voltage of accelerator pedal 1 signal is 0.8V, and the voltage of accelerator pedal 2 signal is 0.4V. The two signals maintain a proportional relationship, which is normal. However, the ECU still reports the fault code and it cannot be cleared. Throttle response: When attempting to accelerate via the pedal, both signals change synchronously and maintain the proportional relationship, but the fault code still cannot be cleared. The inability to clear the fault code means the vehicle cannot be delivered to the customer, so a thorough investigation of this fault point is necessary.
Recently, I've been frequently researching this throttle pedal signal malfunction, which primarily occurs in electronic throttle systems. Modern vehicles typically have two position sensors monitoring the pedal angle, designed with safety redundancy in mind to avoid single-point failures. If the two signals show unreasonable mismatches, common causes include sensor drift, physical wear or contamination leading to reading discrepancies—such as dust accumulation causing poor sensor contact. It could also be due to wiring shorts, open circuits, or connector corrosion from moisture; or an ECU software bug causing calculation errors. Symptoms usually include the dashboard warning light illuminating, sluggish or sudden jerky responses when pressing the accelerator, affecting driving smoothness. I recommend first using an OBD scan tool to read the fault codes and locate the problematic area. Typically, cleaning the sensors or replacing components is required. Ignoring the issue may escalate into more severe failures like engine stalling. Regular maintenance checks on such electronic components can reduce the likelihood of occurrence—safety first!