C0470

Code

Generic C — Chassis

Rear Wheel Speed Sensor Circuit Fault

Brand: Generic

Type: C — Chassis

Views: UK: 11 EN: 14 RU: 14

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Page language: EN

Read ABS and chassis modules with a scan tool; record codes and freeze/frame data
Visual inspection of sensor, tone ring, and wiring at both rear wheels for damage, corrosion, or debris
Check ABS/traction-related fuses and relays
Backprobing connector: verify reference voltage and ground (active sensors) or measure resistance (passive sensors)
Spin wheel and monitor sensor signal with multimeter (AC volts) or oscilloscope (preferred)
Wiggle test the harness and connectors while monitoring signal to reveal intermittent faults

Passive (magnetic) sensor: produces AC voltage proportional to wheel speed. At low speed signal may be tens to hundreds of millivolts, amplitude and frequency increase with speed.
Active (Hall/VR) sensor: typically uses a reference voltage (commonly 5 V) and provides a square or pulse signal switching between ~0 V and reference (vehicle-specific).
Sensor resistance (passive) is commonly in the hundreds to low thousands of ohms — consult vehicle data for exact value.
With oscilloscope: expect a clean, consistent waveform with amplitude/frequency proportional to wheel speed; intermittent dropouts or noise indicate sensor or wiring issues.

Retrieve codes from ABS module and note which wheel(s) are affected and any related codes.
Perform a visual inspection of the rear sensor(s), connector(s), tone ring, and wiring for damage, corrosion, contamination, or missing reluctor teeth.
Check ABS/traction fuses and relays; restore if blown and re-test. If fuse repeatedly blows, suspect short circuit.
Identify sensor type (passive vs active). For active sensors: backprobe connector with key ON, engine OFF and verify reference voltage and ground. For passive: measure sensor resistance and compare to spec.
Rotate wheel while measuring output: for passive use AC volts; for active use a scope or voltmeter to observe switching pulses. Compare left/right rear signals.
Perform a wiggle/ride-out test: manipulate wiring/connectors while monitoring signal to find intermittent faults.
Check continuity from sensor connector to ABS module connector and verify grounds. Repair any opens, shorts, or chafing.
Inspect and repair or replace damaged tone ring or wheel bearing if physical damage found.
If wiring and tone ring are good and sensor fails electrical tests, replace the sensor and retest.
Clear codes, perform a road test while monitoring wheel speed signals and confirm the fault does not return.
If fault persists after sensor and wiring replacement, investigate ABS module input circuits and scan tool communication; consider module repair or replacement as last resort.