With 4 Wheel Disc Brakes

DTC C0021 Right Front Wheel Speed Sensor Circuit Open Or Shorted To Battery (Part 1 Of 2):

DTC C0021 Right Front Wheel Speed Sensor Circuit Open Or Shorted To Battery (Part 2 Of 2):

ABS RF Wheel Speed Sensors Schematic:

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 CODE (DTC)
No output signal from right front wheel speed sensor for 1.0 second.
Excessive right front wheel speed sensor resistance for 1.0 second.

ACTION TAKEN WHEN THE DTC SETS
^ ANTILOCK indicator lamp is illuminated
^ ABS is disabled

NOTE: This DTC is a Condition Latched DTC which indicates the above is true only as long as the condition persists.

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 back 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/resistance values.

^ -40 to 4°C (-40 to 40°F)
@ 1089 to 1630 ohms

^ 5 to 43°C (41 to 110°F)
@ 1337 to 1900 ohms

^ 44 to 93°C (111 to 200°F)
@ 1560 to 2230 ohms

^ 94 to 150°C (201 to 302°F)
@ 1850 to 2651 ohms

TEST DESCRIPTION
The numbers below refer to the numbers on the diagnostic chart.
2. Measure the resistance of the 4-way Electronic Brake Control Module (EBCM) harness connector terminals C and E.
3. Measure the resistance of the right front sensor harness.
4. Measure the resistance of the right front wheel Speed Sensor.