C0021

DTC C0021 Circuit Diagram:

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 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 DTC IS SET
- ANTILOCK indicator lamp is illuminated
- Antilock Brake System (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. Refer to Wheel Speed Sensor, Service and Repair. Service and Repair

NOTE: Resistance of the wheel speed sensor will increase with an increase in sensor temperature. Refer to the following table for temperature/resistance values.

^ When temperature is between -40 - 4 °C (-40 - 40 °F) resistance is 702 to 1060 ohms.
^ When temperature is between 5 - 43 °C (41 - 110 °F) resistance is 855 to 1230 ohms.
^ When temperature is between 44 - 93 °C ( 111 - 200 °F) resistance is 1000 to 1440 ohms.
^ When temperature is between 94 - 150 °C (201 - 302 °F) resistance is 1170 to 1661 ohms.

DTC CHART TEST DESCRIPTION

DTC C0021 Diagnostic Chart (Part 1 Of 2):

DTC C0021 Diagnostic Chart (Part 2 Of 2):

NOTE: Number(s) below refer to number(s) 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.

4WAL Connector Face Views: