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DTC C1221-C1224: Wheel Speed Sensor Input Signal=0

  1. Ensure ignition switch is in LOCK position. Inspect suspect wheel speed sensor harness, sensor and sensor rotor for damage. Repair as needed. If all components are okay, go to next step.
  2. Determine if DTCs C1232-1235 are present. Repair those DTCs before proceeding. If DTCs C1232-1235 are not present, go to next step.
  3. Connect scan tool to DLC. Select DATA LIST and monitor wheel speed sensors. Test drive vehicle. Accelerate to greater than 15 MPH, then slowly decelerate to complete stop. Repeat test drive 3 more times. Determine if DTC is still present or if wheel speed of suspect sensor suddenly drops to zero MPH prior to complete stop. If fault is still present, go to next step. If fault is no longer present, DTC is intermittent. Inspect harness and connections for damage or corrosion. Repair as needed.
  4. Ensure ignition switch is in LOCK position. Raise and support vehicle. Disconnect ABS actuator assembly harness connector. Using DVOM on AC scale, measure voltage between suspect wheel speed sensor terminals on actuator harness connector. See WIRING DIAGRAMS  . Spin wheel while monitoring DVOM. If voltage is more than 100 mV, replace ABS actuator assembly. If voltage is 100 mV or less, go to next step.
  5. Disconnect harness connector of suspect wheel speed sensor. Measure resistance between component terminals. If resistance is 800-1600 ohms, go to next step. If resistance is not 800-1600 ohms, replace wheel speed sensor and retest.
  6. Using DVOM on AC scale, measure voltage between suspect wheel speed sensor. Spin wheel while monitoring DVOM. If voltage is more than 100 mV, go to next step. If voltage is 100 mV or less, replace wheel speed sensor and retest.
  7. Check continuity of circuits between ABS actuator harness connector and suspect wheel speed sensor harness connector. See WIRING DIAGRAMS  . If continuity does not exist on either sensor circuit, repair open circuit as needed and retest. If continuity exists on both circuits, go to next step.
  8. Check continuity between suspect wheel speed sensor terminals on ABS actuator harness connector. See WIRING DIAGRAMS  . If continuity does not exist, go to next step. If continuity does exist, repair short between sensor circuits and retest.
  9. Connect all harness connectors. Test drive vehicle at various speeds and road surfaces. If DTC(s) resets, replace ABS actuator assembly. If DTC(s) do not reset, system is currently functioning correctly.
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