Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
To diagnose the P0503 Lexus code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.
Vehicles, which are equipped with ABS (Anti-lock Brake System), detect the vehicle speed using the Skid Control ECU (Brake Actuator Assembly) and speed sensor. The speed sensor monitors the wheel rotation speed and sends a signal to the Skid Control ECU. The Skid Control ECU converts the wheel speed signal into a 4-pulse signal and transmits it to the Engine Control Module (ECM) via the combination meter assembly. The ECM determines the vehicle speed based on the frequency of the pulse signal.
If a malfunction (a rapid change in vehicle speed) in the vehicle speed signal being output from the brake actuator assembly (skid control ECU) is detected while the cruise control is in operation, the ECM determines there to be a momentary interruption or noise and stores a Diagnostic Trouble Code (DTC).
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