In vehicles equipped with ABS (anti-lock braking system), the speed is determined by the skid control ECU and the wheel speed sensor. The wheel speed sensor monitors the wheel speed and sends appropriate signals to the skid control ECU. The skid control ECU converts the received wheel speed signals into a 4-pulse signal and sends it to the ECM via the instrument panel. The ECM determines the vehicle speed based on the frequency of this pulse signal.

DTC P2238 Oxygen (A/F) Sensor Pumping Current Circuit Low (Bank 1 Sensor 1). DTC P2239 Oxygen (A/F) Sensor Pumping Current Circuit High (Bank 1 Sensor 1). DTC P2252 Oxygen (A/F) Sensor Reference Ground Circuit Low (Bank 1 Sensor 1). DTC P2253 Oxygen (A/F) Sensor Reference Ground Circuit High (Bank 1 Sensor 1). Description. Monitor description. Wiring diagram. Inspection procedure.

Diagnostic Trouble Code (DTC) P0504 Brake Switch "A" / "B" Correlation Description. Wiring diagram. Inspection procedure.