DTC 23

DTC 23 Right Front Wheel Speed Sensor Continuity Malfunction






Circuit Description

As each wheel turns, the signal generated by each wheel speed sensor is sent to the EBTCM. The EBTCM uses the wheel speed sensor signal to calculate vehicle reference speeds and individual speed, acceleration and slip values for each wheel. These values are used to determine when antilock control is required.

The EBTCM will only set one wheel speed sensor fault code at a time, even if multiple faults exist. Detection is prioritized accordingly: LF, RR, LR, RF. Always check for additional stored codes after making repairs.

DTC will set when

Code 23 is set if there is a short to voltage or ground in CKT 872 or 833, or faulty speed sensor. The testing for this fault occurs with the ignition in "RUN" and the vehicle at rest.

Action Taken

1. Code set.
2. ABS/TCS switched "OFF".
3. "ANTILOCK" indicator "ON".
4. "TRACTION DISABLED" message displayed.

Test Description

Test numbers refer to circled numbers on the diagnostic chart.

1. Checks for proper resistance in the sensor itself.
2. Checks for a short to battery in either of the speed sensor circuit wires.
3. Checks for an open in both the speed sensor circuit wires.
4. Manipulates wiring and connectors, trying to induce an intermittent fault not currently present.
5. This test checks if the code resets on key-up. If so, since Tests 1-4 have validated that the circuitry and components are good.
6. Checks if the Code 21 sets during a road test.
7. The wheel speed sensor may be causing an intermittent fault. If Code 23 resets after sensor replacement, the EBTCM has an internal malfunction.

Diagnostic Aids

Be sure the speed sensor wiring is properly routed and retained. This will help prevent false signals due to electrical noise being picked up by the wiring. It is very important that a thorough inspection of the wiring and connectors be performed.