DTC 23
DTC 23 or 27Test 1-10:
Circuit Description
As the wheel spins, the wheel speed sensor produces an Alternating Current (AC) signal. The Electronic Brake Control Module (EBCM) uses the frequency of the AC signal to calculate the wheel speed.
Conditions for Running the DTC
The ignition is in the ON position.
Conditions for Setting the DTC
The EBCM detects a short, open or high resistance in the front wheel speed sensor circuits.
Action Taken When the DTC Sets
The following actions occur:
- The EBCM disables the Antilock Brake System (ABS) and traction control system for the duration of the ignition cycle.
- The ABS and TRAC OFF indicators turn ON.
Conditions for Clearing the DTC
The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used.
Diagnostic Aids
Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with the reappearance of the malfunction.
The following are possible causes of the malfunction:
- A short to ground or a short to voltage in the front wheel speed sensor circuitry
- An open or high resistance in the front wheel speed sensor circuitry
- A malfunctioning front wheel speed sensor
- An internal EBCM malfunction
If an intermittent malfunction exists, refer to Testing for Intermittent and Poor Connections Diagnostic Aids.
Test Description
The numbers in the image refer to the step numbers on the diagnostic table.
5. This step tests the front wheel speed sensor circuits for a short, open or high resistance.