2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 939
Circuit/System Description
The wheel speed sensor receives ignition voltage from the electronic brake control module (EBCM) and provides a DC square wave signal back to
the module. As the wheel spins, the EBCM uses the frequency of the square wave signal to calculate the wheel speed.
Conditions for Running the DTC
* Ignition ON.
* Ignition voltage is greater than 10 volts.
* The brake pedal is not pressed.
* Two or three other wheel speeds are greater than 0 km/h.
Conditions for Setting the DTC
C0035 04 - C0050 04, C0035 0E - C0050 0E,C1232 - C1235, or C1207 - C1210
A short to voltage, short to ground or an open/high resistance is detected on a wheel speed sensor circuit.
C0035 26 - C0050 26, C0035 27 - C0050 27, C0035 1F - C0050 1F, C1221 - C1224, C1225 - C1228, or C1221 - C1224
* A missing wheel speed sensor signal.
* An erratic signal output of the wheel speed sensor is detected.
* The EBCM detects a change in wheel speed that exceeds 20 km/h (12 mph) between two 10 millisecond wheel speed samples.
Actions Taken when the DTC Sets
* The EBCM disables the antilock brake system (ABS), traction control and StabiliTrak for the duration of the ignition cycle.
* A driver information center message and/or a warning indicator may be displayed.
Conditions for Clearing the DTC
* The condition for the DTC is no longer present.
* Operate the vehicle at speeds greater than 15 km/h (10 mph) to complete the self test, and the EBCM will turn off the ABS indicator.
* The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.
Diagnostic Aids
* Inspect the back of the wheel bearing on the encoder surface for metal debris that could cause an erratic reading with the sensor. Do not use a
magnet to clean the debris, or damage to the encoder ring may occur.
* If 2 or more wheel speed sensors are inoperative diagnose each wheel speed sensor individually.
If the customer comments that the ABS indicator is ON only during moist environmental conditions: rain, snow, vehicle wash, etc., inspect the
wheel speed sensor wiring for signs of water intrusion. If the DTC is not current, clear all DTCs and simulate the effects of water intrusion by using
the following procedure:
