Speedometer Malfunction: Description

The combination meter assembly receives vehicle speed signals from the skid control ECU via the CAN communication system. The speed sensor detects the wheel speed and sends the appropriate signals to the skid control ECU. The skid control ECU supplies power to the vehicle speed sensor. The skid control ECU detects vehicle speed signals based on pulses of the voltage.

HINT: 

• Factors that affect the indicated vehicle speed include the tire size, tire inflation, and tire wear. The speed indicated on the speedometer has an allowable margin of error. This can be tested using the Techstream. For details about testing and the margin of error, see the reference chart. Refer to ON-VEHICLE INSPECTION [06/2012 - ] .
• If the vehicle speed sensor circuit has a malfunction, the skid control ECU stores DTCs. Troubleshoot the Electronically Controlled Brake System. Refer to DTC CHECK / CLEAR [06/2012 - ] .