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Home / DTC / C1205 — FL wheel speed sensor

C1205 — FL wheel speed sensor

Detailed page for trouble code C1205.

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C1205

MITSUBISHI C — Chassis

FL wheel speed sensor

Brand: MITSUBISHI
Type: C — Chassis
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or contaminated FL wheel speed sensor
  • Open, shorted or corroded wiring/connectors between FL sensor and ABS/ECU
  • Incorrect sensor air gap or misaligned sensor/tone ring
  • Damaged or missing tone ring (reluctor) or heavy buildup of debris/metal on tone ring
  • Intermittent wiring (chafing, broken wires) or poor ground
  • Faulty ABS/traction control ECU or internal driver fault

Symptoms

  • ABS and/or traction control (TCS/ESC) warning lamp illuminated
  • Possible illumination of stability or master warning light
  • Loss of ABS/traction control functionality; system disabled until fault cleared
  • Speedometer or cruise control may behave erratically on some vehicles
  • Possible brake pulsation during ABS activation or uneven braking in slippery conditions

What to check

  • Read and record freeze frame data and stored ABS codes with a scan tool; confirm C1205 is current or historic
  • Perform a visual inspection of the FL sensor, tone ring, connector, and wiring harness for damage, corrosion, debris or loose mounting
  • With vehicle safely raised and supported, spin the front-left wheel and visually inspect tone ring for missing teeth, heavy rust, or foreign material
  • Backprobe the sensor connector and check for reference supply voltage and ground (if Hall-type) using a digital multimeter or scan tool live data
  • Measure sensor output while spinning the wheel: use an oscilloscope to view waveform or a multimeter (AC for VR sensors); look for consistent increasing amplitude/frequency with speed
  • Check continuity and resistance of the sensor circuit to the ECU; wiggle harness while monitoring for intermittent changes

Signal parameters

  • Hall-effect sensors (common): 3-wire — reference 5 V (or ignition 12 V on some systems), ground, and signal output ~0–5 V square wave; frequency proportional to wheel speed
  • Variable Reluctance (VR) sensors: 2-wire — AC voltage output that increases in amplitude with wheel speed (mV to volts depending on speed); waveform sinusoidal/AC
  • Typical behavior to expect: signal frequency increases linearly with wheel speed; amplitude stable and similar to other wheels when spinning at same speed; no signal or erratic waveform indicates fault

Diagnostic algorithm

  1. Connect a scan tool, read and record codes and live data for all wheel speed sensors; note if FL sensor is showing 0 Hz or erratic values while others change with wheel spin.
  2. Perform a visual inspection of FL sensor, connector, tone ring and surrounding area; remove debris and correct obvious problems.
  3. With ignition on (engine off) backprobe FL sensor connector: for Hall sensors check reference voltage (≈5 V) and ground; for VR sensors measure resistance across the two pins and compare to specification if available.
  4. Jack and support vehicle; spin the FL wheel by hand or with scan tool-driven wheel speed display while observing sensor output with an oscilloscope or multimeter (AC for VR). Look for a clean, regular waveform that increases with speed.
  5. If no/weak signal, inspect and test continuity of wiring between sensor and ABS ECU; repair any open/shorts, pins, corrosion or poor grounds.
  6. Inspect tone ring for damage or missing teeth; measure sensor-to-reluctor air gap and correct per service spec.
  7. If sensor output is abnormal and wiring is good, replace the FL wheel speed sensor and retest.
  8. After repair, clear codes and perform a road test or spin test to confirm the FL sensor reports correctly and the ABS/TCS lamp remains off.
  9. If fault persists with verified good sensor and wiring, investigate ABS/ECU internal faults or seek manufacturer-specific diagnostic procedures.

Likely causes

  • Broken or corroded connector/wiring to FL sensor
  • Contaminated/damaged FL sensor or tone ring
  • Incorrect sensor air gap or mounting damage

Fault status

⚠️ Status
Front-left wheel speed sensor circuit fault (FL wheel speed sensor) — signal missing/erratic or circuit malfunction.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

C1200 C1201 C1204 C1210 C1234
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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