Verify the integrity of the accelerator pedal signal by checking for fault code 558, which indicates a conflict between the idle switch and the potentiometer signal. Use a diagnostic scanner to observe the 'Accelerator Pedal Position' and 'Idle Switch' status in live data mode. Ensure the idle switch toggles correctly and the potentiometer signal remains stable at 0% input when the pedal is released. Any erratic voltage spikes or conflicting signals confirm a fault in the pedal assembly or its harness.
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