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DTC C1225-C1228: Excessive Wheel Speed Variation

  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. Connect scan tool to DLC. Select DATA LIST and monitor wheel speed sensors. Start and idle engine in Park. Monitor wheel speed sensors while raising and lowering engine speed. Determine if DTC is still present or if wheel speed sensor displays speed data reading with vehicle at 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.
  3. 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 varies more than 5 MPH compared to other sensors. 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. 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.
  5. 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.
  6. 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.
  7. 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.
  8. 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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