The wheel speeds are detected by active wheel speed sensors. Each wheel speed sensor receives a 12 V reference voltage from the electronic brake control module (EBCM) and provides an alternating current square wave signal to the EBCM. As the wheel spins, the EBCM uses the frequency of the square wave signal to calculate the wheel speed. The EBCM sends the wheel speed information as a high speed controller area network (CAN) serial data message. Modules connected to the high speed CAN circuit monitor for the vehicle speed information.

System voltage is between 9 and 16 V

A supervised periodic message that includes the wheel speed serial data has not been received.

The electronic suspension control is disabled for the duration of the ignition cycle.

A current DTC clears when the diagnostic runs and passes.

Schematic Reference

Electronic Suspension Control Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Electronic Suspension Control Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, observe the scan tool EBCM Wheel Speed Sensor parameters. The reading should be the same speed on all sensors when driving in a straight line at a speed greater than 20 km/h (13 MPH).

1. Ignition ON, verify that DTC C0035, C0040, C0045, or C0050 is not present in the EBCM.

⇒	If any listed DTC is present, refer to Diagnostic Trouble Code (DTC) List - Vehicle to diagnose that DTC prior to this diagnostic.

2. Replace the K19 Electronic Suspension Control (ESC) Module and verify the DTC does not reset.

⇒	If the DTC resets, replace the K17 Electronic Brake Control Module (EBCM).