Speedometer Malfunction: Description

The meter ECU receives the vehicle speed signal from the skid control ECU via the CAN communication system. The speed sensors detect the wheel speed and send signals to the skid control ECU. The skid control ECU supplies power to the vehicle speed sensors. The skid control ECU creates the vehicle speed signal based on the pulses of the voltage.

HINT: 

• Factors that affect the indicated vehicle speed include 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 .
• If the vehicle speed sensor circuit has a malfunction, the skid control ECU stores DTCs. Troubleshoot Electronically Controlled Brake System. Refer to DIAGNOSTIC TROUBLE CODE CHART .