C0023

Right Front Wheel Speed Sensor Circuit Schematic:

DTC C0023 - Right Front Wheel Speed Signal Erratic:

CIRCUIT DESCRIPTION
As a toothed ring passes by the wheel speed sensor, changes in the electromagnetic field cause the wheel speed sensor to produce a sinusoidal (AC) voltage signal whose frequency and amplitude is proportional to wheel speed. The magnitude of this signal is directly related to wheel speed and the proximity of the wheel speed sensor to the toothed ring, often referred to as the air gap.

CONDITIONS FOR SETTING DIAGNOSTIC TROUBLE CODES (DTCs)
^ Average wheel speed for all wheel speed signals is greater than 25mph.
^ Average right front wheel speed is greater than 25mph.
^ No output is detected from the right front wheel speed signal for 15ms.
^ Something suddenly (intermittently) prevents the right front wheel speed signal to drop to 0 while the vehicle is moving greater than 25mph.

ACTION TAKEN WHEN THE DTC SETS
^ ANTILOCK indicator lamp is illuminated
^ Antilock Brake System (ABS) is disabled

NOTE: DTC C0023 is an Ignition Latched DTC, which indicates that the above is true until the ignition switch is turned to the Off position (even if the cause of the DTC is intermittent).

DIAGNOSTIC AIDS
An intermittent malfunction may be caused by a poor connection, rubbed through wire insulation, or a wire that is broken inside the insulation.
Any circuitry that is suspected of causing the intermittent complaint should be thoroughly checked for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wiring connections or physical damage to the wiring harness.
When inspecting a wheel speed sensor, inspect the sensor terminals and harness connector for corrosion. If evidence of corrosion exists, replace the wheel speed sensor.
Resistance of the wheel speed sensor will increase with an increase in sensor temperature. Refer to the following table for temperature and resistance values.

-40 to 4°C (-40 to 40°F) 1575 to 2950 ohms
5 to 43°C (41 to 110°F) 1980 to 3450 ohms
44 to 93°C (111 to 200°F) 2250 to 4100 ohms
94 to 150°C (201 to 302°F) 2750 to 4760 ohms

DTC CHART TEST DESCRIPTION

NOTE: Number(s) below refer to number(s) on the diagnostic chart.

2. Check Electronic Brake Control Module (EBCM) 4-way connector for looseness, corrosion, etc.
3. Measure the resistance of EBCM 4-way connector pins C and E.
4. Measure resistance at the right front wheel speed sensor connector.
5. Inspect the right front wheel speed sensor and tone wheel for physical damage or excessive clearance.