C1050

Code

FIAT C — Chassis

Right rear wheel speed sensor

Brand: FIAT

Type: C — Chassis

Views: UK: 18 EN: 41 RU: 27

AI status

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Page language: EN

Connect a diagnostic scanner, read/record freeze frame and freeze DTC history
Inspect right rear wheel area: sensor, connector, harness, and tone wheel for visible damage, contamination, missing teeth or excessive air gap
Visually inspect connector pins for corrosion, bent pins or water ingress
Check for stored related codes for other wheels or communication faults
Backprobe the sensor connector and check for reference power and ground (if active sensor) with ignition on
Measure sensor resistance (for passive sensors) with multimeter and compare to specification

Passive (magnetic) sensor: DC resistance typically in the hundreds to low thousands of ohms (manufacturer spec required) — open circuit or very high/low reading indicates fault
Active (Hall/variable reluctance with electronics) sensor: typically has a reference supply (often 5V or ignition-switched) and outputs a pulsed voltage; expected output is a square or sinusoidal-like waveform whose amplitude and frequency increase with wheel speed (approx. 0.5–4.5 V typical for many systems)
With wheel rotated at low speed (hand spin) you should see a clean, repeatable waveform on an oscilloscope; no waveform or excessive noise indicates sensor or tone wheel problem

Read and record all diagnostic trouble codes and freeze frame data with an OBD/ABS scan tool
Visually inspect right rear sensor, wiring, and tone ring for damage, debris, corrosion or excessive air gap; clean if contaminated
Clear the code and perform a low-speed road test while monitoring live wheel speed data to confirm fault behavior
With vehicle safely supported and wheel removed, disconnect sensor and inspect connector pins; check for corrosion, bent pins or water intrusion
Measure sensor resistance (if passive) and compare to spec; for active sensors check reference voltage and ground at connector with ignition on
Rotate wheel by hand while observing scan tool/oscilloscope waveform at sensor; perform wiggle tests on harness to detect intermittent faults
Check continuity from sensor connector to ABS module and for shorts to ground or battery using multimeter
If wiring and connectors are good but no proper signal, replace the right rear wheel speed sensor; retest and clear codes
If new sensor does not restore signal and wiring checks good, consider ABS module input fault and consult manufacturer diagnostic procedures before replacing module

⚠️ Status

ABS/TC control unit reports invalid or missing speed signal from right rear wheel speed sensor; ABS/traction functions may be reduced or disabled.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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