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Home / DTC / C1933 — Acceleration sensor,Tire3

C1933 — Acceleration sensor,Tire3

Detailed page for trouble code C1933.

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Code

C1933

MITSUBISHI C — Chassis

Acceleration sensor,Tire3

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

Causes

  • Faulty acceleration/wheel acceleration sensor at Tire 3
  • Damaged or corroded wiring or connector (open, short to power/ground, high resistance)
  • Poor sensor mounting or physical damage/contamination (dirt, impact)
  • Faulty ABS/traction/stability control module or internal input circuit
  • Intermittent connector contact due to vibration
  • Required sensor/ECU calibration or software fault

Symptoms

  • ABS, ESC, or traction control warning lamp illuminated
  • Reduced or disabled stability/traction control functionality
  • Possible abnormal braking behavior under ABS intervention
  • Diagnostic trouble codes stored for wheel/acceleration sensor circuits
  • Intermittent warnings that may change with vehicle speed or steering

What to check

  • Retrieve all stored codes and freeze-frame data with a diagnostic scanner
  • Visually inspect Tire 3 sensor, connector and wiring harness for damage, corrosion, pins pushed out or water ingress
  • Check connector continuity and for corrosion; reseat connectors
  • Measure reference supply voltage and ground at the sensor connector
  • Measure sensor output signal at rest and while wheel is rotated or vehicle is driven (if safe)
  • Compare signal values to another wheel/sensor for reference

Signal parameters

  • Typical connections: Reference voltage (often ~5 V), ground, and signal output (analog voltage or frequency/pulse)
  • Idle/rest output: approx. mid-rail (~2.5 V) for many analog accelerometers; exact value depends on sensor type
  • Operating range: output varies with acceleration (±g range); some sensors provide frequency/encoded data
  • Expected signal behavior: smooth change with wheel/vehicle movement; no long drops to 0 V or constant max voltage
  • Open circuit: infinite resistance on signal or reference; short to ground/power: near 0 V or supply voltage

Diagnostic algorithm

  1. Connect a capable scan tool; read and record all DTCs and freeze-frame data. Note whether code is current or intermittent.
  2. Perform a visual inspection of sensor, bracket, and harness at Tire 3 for damage, missing fasteners, contamination or water entry.
  3. With ignition ON, backprobe the sensor connector. Verify reference supply voltage and ground integrity per manufacturer spec.
  4. Probe the sensor signal wire. With the wheel static, observe signal voltage/frequency; then have an assistant rotate the wheel or perform a low-speed drive-by while monitoring the signal (safe, controlled conditions).
  5. Compare readings to the same sensor circuit on another wheel or to manufacturer specified values. Look for open/shorts or no signal.
  6. Wiggle test the harness and connector while monitoring the signal to check for intermittent faults.
  7. If wiring or connector faults are found, repair or replace harness/connector and retest.
  8. If wiring checks good, swap the suspected sensor with a known-good sensor from another wheel (if interchangeable) and check if the code follows the sensor.
  9. If fault persists on the same vehicle location after swapping, suspect harness or ECU input. Check ECU power/ground and input circuits.
  10. After repair or replacement, clear codes, perform required sensor/vehicle calibration or relearn procedures, then road test to confirm the repair.
  11. If all tests are inconclusive, consult manufacturer diagnostic procedures, wiring diagrams, and consider ECU replacement only after confirming input circuitry failure.

Likely causes

  • Connector corrosion or loose connector at the sensor
  • Broken wire or pinched harness to wheel/sensor
  • Failed sensor element (internal short/open or out-of-spec output)
  • Sensor contaminated, misaligned or mechanically damaged

Fault status

⚠️ Status
Acceleration sensor (Tire 3) circuit fault — check sensor, connector, wiring and module; perform calibration after repair.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

C1930 C1931 C1932 C1934 C1950
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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