Circuit Description

DTC definitions:

• DTC C0035
  
  Left front wheel speed circuit malfunction.
• DTC C0036
  
  Left front wheel speed circuit range/performance.
• DTC C0040
  
  Right front wheel speed circuit malfunction.
• DTC C0041
  
  Right front wheel speed circuit range/performance.
• DTC C0045
  
  Left rear wheel speed circuit malfunction.
• DTC C0046
  
  Left rear wheel speed circuit range/performance.
• DTC C0050
  
  Right rear wheel speed circuit malfunction.
• DTC C0051
  
  Right rear wheel speed circuit range/performance.

Speed sensor used on this vehicle is a multiple pole magnetic pickup. Sensor produces an AC signal that EBCM uses frequency from to calculate wheel speed.

DTC C0035, C0040, C0045 or C0050 sets when ignition is on and EBCM detects a short to voltage (wheel speed sensor signal circuit greater than 4.25 volts) or an open (wheel speed sensor signal circuit voltage is greater than 4.25 volts and wheel speed sensor return circuit voltage is less than 0.75 volt) for more than 0.02 second.

DTC C0036, C0041, C0046 or C0051 sets when all of the following conditions exists for 10 milliseconds:

• Suspect wheel speed equals zero.
• Other wheel speeds are greater than 25 MPH for 0.01 second.
• Suspect wheel equals zero during drive-off, and other wheels are greater than 7.5 MPH.
• Short to ground (wheel speed sensor signal circuit is shorted to ground).
• Deviation of two wheel speeds at either side of vehicle is greater than 4 MPH, or at front axle, greater than 6 MPH for a time period of 10 to 20 seconds.