C0224 — Rear Left Wheel Speed Sensor Circuit Fault

Diagnostic algorithm

1. Retrieve and record codes and live data with a scan tool; note freeze frame and any other related codes.
2. Visually inspect rear left sensor, connector, harness, and tone ring for damage, contamination, or missing teeth. Repair obvious damage.
3. With ignition off, disconnect sensor and inspect connector pins for corrosion, bent pins, and ensure secure fit. Clean and apply dielectric grease if specifying.
4. Measure sensor terminal resistance (for passive sensors) and compare to OEM spec. For active sensors, check reference supply (usually 5V) and ground with ignition on.
5. With wheel elevated and secure, spin wheel while monitoring wheel speed signal on scan tool or oscilloscope. Look for smooth/resetting frequency or waveform dropouts—perform wiggle test on wiring/harness.
6. If no signal or irregular signal persists, check continuity from sensor connector to ABS module connector and check for short to ground or battery. Repair wiring as needed.
7. Inspect/repair or replace damaged tone ring or wheel bearing if sensor gap or ring damage present. Reinstall and confirm correct air gap per spec.
8. Replace sensor if electrical tests fail or waveform is invalid after wiring and tone ring confirmed good.
9. Clear codes and road-test to confirm fault does not return. If fault persists after sensor and wiring repairs, consider ABS module diagnosis or consult manufacturer-specific procedures.