C0474

Code

Generic C — Chassis

ABS Rear Right Wheel Speed Sensor Circuit Malfunction

Brand: Generic

Type: C — Chassis

Views: UK: 11 EN: 13 RU: 12

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ABS warning lamp illuminated
Traction control / stability control warning light may also be on
ABS not available during braking (reduced braking performance under ABS conditions)
Intermittent or constant loss of traction control intervention
Possible speedometer/odometer oddities on some vehicles
Noise from wheel bearing or rough wheel rotation if mechanical damage present

Read ABS codes and freeze frame data with a capable scan tool; record live wheel speed sensor data
Visual inspection of rear-right sensor, connector, wiring harness and tone ring for damage, contamination or missing teeth
Check for corrosion or water in the sensor connector and proper mating
Wiggle test wiring while watching live data for intermittent value changes
Measure sensor resistance (if applicable) and compare to manufacturer spec
Check for proper reference voltage and ground at sensor connector (Hall-type sensors)

Passive variable reluctance (VR) sensor: AC voltage waveform; amplitude increases with wheel speed. Expect a sine-like AC signal; low-speed amplitude may be small (hundreds of millivolts), rising to volts at higher speeds.
Active/Hall-effect sensor: digital square wave or pulse with reference voltage (typically 5V or vehicle logic voltage); output switches between ~0V and reference when wheel rotates.
Typical VR sensor resistance: manufacturer-specific (example ranges often ~500–2000 ohms). Measure per service manual.
Pulse frequency proportional to wheel speed. Waveform should be steady and clean without dropouts or noise spikes.
Open circuit = infinite resistance; short-to-ground or short-to-Vref will show abnormal voltage readings at connector.

Confirm code and note freeze-frame / conditions (speed, temp). Clear codes and attempt to reproduce.
Perform visual inspection of sensor, connector, harness route and tone ring for damage, contamination, missing teeth or debris.
Disconnect sensor connector and inspect pins for corrosion, bent pins or moisture. Clean and re-connect or replace connector as required.
Check for reference power and ground at the sensor connector (Hall-type). With key on, measure supply voltage and ground; compare to spec.
Measure sensor resistance (if specified) across the sensor terminals. An open or shorted reading indicates a bad sensor.
Spin the wheel and measure AC voltage at the sensor connector for VR sensors, or monitor output pulse for Hall sensors. Use oscilloscope for best results; look for a stable amplitude and consistent frequency.
Perform a wiggle test on harness and connectors while monitoring live data or oscilloscope for intermittent faults.
Inspect and verify tone ring condition and wheel bearing. Replace tone ring or hub assembly if reluctor is damaged or contaminated.
If wiring and sensor test good, inspect ABS module connector/pins and harness continuity back to module. Repair any short/open to module.
After repair or replacement, clear codes, perform a road test to verify correct wheel speed signals and ensure code does not return.