DTC 28 Wheel Speed Sensor Frequency Error: Notes

Toothed wheel generates a voltage pulse as it moves past sensor. EBTCM/EBCM uses these pulses to determine wheel speed. EBTCM/EBCM uses wheel speed sensor signal to calculate vehicle reference speeds and speed, acceleration and slip values for each wheel. These values are used to determine when anti-lock control is needed.

DTC 28 will set when EBTCM cannot specifically identify which wheel speed sensor is causing problem.

1. Checks wiring and connection for problems.
2. Use Tech 1 to monitor for vehicle electrical system noise pick-up by speed sensor circuits.
3. Use Tech 1 to monitor wheel speed sensors while vehicle is operating.
4. Checks for correct resistance in sensor. 5a) Replaces rear wheel speed sensor as probable cause of intermittent. 5b) Replaces front wheel speed sensor as probable cause of intermittent.
5. Checks if DTC resets during test drive.