Code
C1933
MITSUBISHI
C — Chassis
Acceleration sensor,Tire3
Views:
UK: 8
EN: 11
RU: 10
AI status
Completed
Completed
100%
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
- Connect a capable scan tool; read and record all DTCs and freeze-frame data. Note whether code is current or intermittent.
- Perform a visual inspection of sensor, bracket, and harness at Tire 3 for damage, missing fasteners, contamination or water entry.
- With ignition ON, backprobe the sensor connector. Verify reference supply voltage and ground integrity per manufacturer spec.
- 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).
- Compare readings to the same sensor circuit on another wheel or to manufacturer specified values. Look for open/shorts or no signal.
- Wiggle test the harness and connector while monitoring the signal to check for intermittent faults.
- If wiring or connector faults are found, repair or replace harness/connector and retest.
- 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.
- If fault persists on the same vehicle location after swapping, suspect harness or ECU input. Check ECU power/ground and input circuits.
- After repair or replacement, clear codes, perform required sensor/vehicle calibration or relearn procedures, then road test to confirm the repair.
- 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
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