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Home / DTC / C1553 — Optical sensor

C1553 — Optical sensor

Detailed page for trouble code C1553.

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Code

C1553

MITSUBISHI C — Chassis

Optical sensor

Brand: MITSUBISHI
Type: C — Chassis
AI status
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Page language: EN

Causes

  • Faulty optical sensor (open, shorted, or internal failure)
  • Damaged wiring harness or chafed insulation to sensor
  • Corroded or loose connector pins
  • Contaminated sensor face (dirt, metal filings, grease)
  • Missing or damaged target/reluctor for the optical sensor
  • Intermittent connection due to movement or heat

Symptoms

  • ABS, traction control (TCS) or stability control warning lamp illuminated
  • Loss of ABS/TCS functionality or limited system operation
  • Inconsistent or no wheel speed reading on scan tool
  • Intermittent faults that may clear after driving or reconnecting
  • Possible speedometer or cruise control issues (if shared signal)

What to check

  • Read and record freeze-frame and live data with a scan tool; note which sensor channel reports the fault
  • Perform visual inspection of the sensor, connector, and wiring for damage, corrosion, or contamination
  • Check for proper mounting and presence/condition of any optical target/tape or tone wheel
  • Wiggle harness and connector while monitoring live data to reproduce intermittent faults
  • Measure sensor resistance and continuity to the ECU connector pins
  • Back-probe connector and measure supply voltage, reference, and output signal with multimeter or oscilloscope

Signal parameters

  • Signal type: optical/optotransistor or photodiode pulse output (pulsed waveform)
  • Typical output level: TTL-style pulses (approx. 0–5 V) or low-voltage square wave depending on design
  • Frequency: proportional to rotational speed (0 Hz at rest, increases with wheel speed)
  • Duty cycle: varies with target geometry; not a steady DC level
  • Expected behavior: clean, consistent pulses with no dropouts; no open or short to ground/power
  • Test method: use oscilloscope for waveform integrity; multimeter for basic presence/absence of pulses

Diagnostic algorithm

  1. Connect a diagnostic scan tool and confirm C1553; note freeze-frame data and affected sensor/channel.
  2. Clear the code, perform a short test drive to see if code returns and observe live sensor data.
  3. Visually inspect the sensor, mounting, and target for contamination, physical damage, or misalignment.
  4. Inspect wiring and connector for corrosion, bent pins, broken wires, or moisture intrusion; repair as needed.
  5. With ignition on (engine off), back-probe the sensor connector and verify reference supply and ground are present per manufacturer specs.
  6. Rotate the wheel/target by hand or drive while monitoring the sensor output with an oscilloscope; look for clean pulses without dropouts.
  7. Check sensor resistance and continuity to the ECU; replace sensor if resistance is out of specification or open/shorted.
  8. If wiring and sensor test OK but signal absent or erratic, isolate and test harness for intermittent shorts to ground or power while moving suspension and wheels.
  9. If wiring and sensor are good, consider ECU input circuit failure; confirm with manufacturer procedures before replacing ECU.
  10. After repair, clear codes and retest to confirm the fault does not return and ABS/traction systems operate normally.

Likely causes

  • Connector corrosion or poor mating at the sensor
  • Wiring damage due to rubbing or repair work
  • Sensor contaminated by brake dust or road debris
  • Sensor damaged by impact or improper installation

Fault status

⚠️ Status
Optical sensor malfunction detected — signal circuit out of range or absent
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

C1550 C1551 C1552 C1554 C1555
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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