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Home / DTC / C1943 — Acceleration sensor,Tire4

C1943 — Acceleration sensor,Tire4

Detailed page for trouble code C1943.

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Code

C1943

MITSUBISHI C — Chassis

Acceleration sensor,Tire4

Brand: MITSUBISHI
Type: C — Chassis
Views: UK: 9 EN: 17 RU: 9
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty acceleration/wheel sensor at Tire 4
  • Damaged or corroded connector or wiring harness (open, short to voltage/ground, intermittent)
  • Poor sensor mounting, incorrect air gap or mechanical damage
  • Contaminated sensor (metal debris, grease) or excessive rust on tone ring/target
  • Faulty wheel bearing or excessive play affecting sensor reading
  • Intermittent power/ground or reference signal from vehicle ECU

Symptoms

  • ABS, ESC or traction control warning light illuminated
  • Loss of traction control or stability assist functionality
  • Possible uneven braking or wheel slip control not operating
  • DTC present in scan tool and may persist after restart
  • Occasional or constant fault depending on wiring/sensor condition

What to check

  • Retrieve freeze-frame and live data with a scan tool; note conditions when code set
  • Visually inspect sensor, tone ring/target and mounting at Tire 4 for damage or contamination
  • Inspect wiring harness and connector for corrosion, broken wires, pin damage, or water ingress
  • Wiggle test harness while monitoring live data for intermittent changes
  • Measure sensor reference, ground and signal with a multimeter or oscilloscope (back-probe connector)
  • Check wheel bearing play and hub for looseness or damage

Signal parameters

  • Sensor type may be magnetic (AC voltage) or active (DC voltage/3-wire with reference and ground); expected idle/rest signal typically steady and changes with wheel acceleration
  • Passive magnetic sensors produce an AC waveform proportional to wheel speed; amplitude increases with wheel speed
  • Active sensors typically supply ~5 V reference and return a varying 0.5–4.5 V signal depending on sensor design (verify exact values in factory documentation)
  • Look for clean waveform on oscilloscope without dropouts, excessive noise, or clipping
  • Continuity: check for expected resistance if spec provided by manufacturer; open or short indicates sensor fault

Diagnostic algorithm

  1. Connect a capable scan tool, read DTCs and freeze-frame data. Note speed, temperature, and load when the code set.
  2. Clear the code, perform a road test or reproduce the conditions to see if C1943 returns to confirm persistence.
  3. Perform a visual inspection of the Tire 4 sensor, sensor mounting, tone ring/target, and connector for damage, debris, or misalignment.
  4. Back-probe the sensor connector. With ignition on, verify reference voltage and ground (for active sensors). Measure signal while rotating the wheel; for passive sensors verify AC output.
  5. Wiggle the wiring and connector while monitoring live data or oscilloscope for intermittent faults.
  6. Check resistance/continuity of the sensor wiring to the ABS/ESC module to identify opens/shorts. Repair any harness damage found.
  7. Inspect wheel bearing/hub for play and ensure the sensor air gap and alignment meet OEM specification. Replace or adjust as required.
  8. If wiring and mounting are good but signal is out of spec, swap the Tire 4 sensor with a known-good sensor from another wheel (if identical) and re-test to isolate sensor vs module/wiring.
  9. If swapping demonstrates sensor fault, replace the sensor and clear codes. If fault follows wiring or remains after sensor swap, inspect/repair harness or consider module diagnostics.
  10. After repair, clear codes and perform road test to confirm the code does not return and that ABS/ESC function is restored.

Likely causes

  • Connector corrosion or pin damage at Tire 4 sensor
  • Broken sensor cable from steering knuckle movement
  • Sensor magnet/target damaged or misaligned
  • Sensor failed electrically (open/short or out-of-spec output)
  • Loose or missing mounting hardware causing improper air gap

Fault status

⚠️ Status
Acceleration sensor (Tire 4) circuit malfunction or invalid signal detected. ABS/ESC/traction systems may be disabled until fault is resolved.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

Similar codes

C0035 C0040 C0210 C1231 C1298
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Code

C1943

Other C — Chassis

Airbag Deployment Indication Input Fault

Brand: Other
Type: C — Chassis
Views: UK: 16 EN: 25 RU: 20
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty acceleration/wheel sensor at Tire 4
  • Damaged or corroded connector or wiring harness (open, short to voltage/ground, intermittent)
  • Poor sensor mounting, incorrect air gap or mechanical damage
  • Contaminated sensor (metal debris, grease) or excessive rust on tone ring/target
  • Faulty wheel bearing or excessive play affecting sensor reading
  • Intermittent power/ground or reference signal from vehicle ECU

Symptoms

  • ABS, ESC or traction control warning light illuminated
  • Loss of traction control or stability assist functionality
  • Possible uneven braking or wheel slip control not operating
  • DTC present in scan tool and may persist after restart
  • Occasional or constant fault depending on wiring/sensor condition

What to check

  • Retrieve freeze-frame and live data with a scan tool; note conditions when code set
  • Visually inspect sensor, tone ring/target and mounting at Tire 4 for damage or contamination
  • Inspect wiring harness and connector for corrosion, broken wires, pin damage, or water ingress
  • Wiggle test harness while monitoring live data for intermittent changes
  • Measure sensor reference, ground and signal with a multimeter or oscilloscope (back-probe connector)
  • Check wheel bearing play and hub for looseness or damage

Signal parameters

  • Sensor type may be magnetic (AC voltage) or active (DC voltage/3-wire with reference and ground); expected idle/rest signal typically steady and changes with wheel acceleration
  • Passive magnetic sensors produce an AC waveform proportional to wheel speed; amplitude increases with wheel speed
  • Active sensors typically supply ~5 V reference and return a varying 0.5–4.5 V signal depending on sensor design (verify exact values in factory documentation)
  • Look for clean waveform on oscilloscope without dropouts, excessive noise, or clipping
  • Continuity: check for expected resistance if spec provided by manufacturer; open or short indicates sensor fault

Diagnostic algorithm

  1. Connect a capable scan tool, read DTCs and freeze-frame data. Note speed, temperature, and load when the code set.
  2. Clear the code, perform a road test or reproduce the conditions to see if C1943 returns to confirm persistence.
  3. Perform a visual inspection of the Tire 4 sensor, sensor mounting, tone ring/target, and connector for damage, debris, or misalignment.
  4. Back-probe the sensor connector. With ignition on, verify reference voltage and ground (for active sensors). Measure signal while rotating the wheel; for passive sensors verify AC output.
  5. Wiggle the wiring and connector while monitoring live data or oscilloscope for intermittent faults.
  6. Check resistance/continuity of the sensor wiring to the ABS/ESC module to identify opens/shorts. Repair any harness damage found.
  7. Inspect wheel bearing/hub for play and ensure the sensor air gap and alignment meet OEM specification. Replace or adjust as required.
  8. If wiring and mounting are good but signal is out of spec, swap the Tire 4 sensor with a known-good sensor from another wheel (if identical) and re-test to isolate sensor vs module/wiring.
  9. If swapping demonstrates sensor fault, replace the sensor and clear codes. If fault follows wiring or remains after sensor swap, inspect/repair harness or consider module diagnostics.
  10. After repair, clear codes and perform road test to confirm the code does not return and that ABS/ESC function is restored.

Likely causes

  • Connector corrosion or pin damage at Tire 4 sensor
  • Broken sensor cable from steering knuckle movement
  • Sensor magnet/target damaged or misaligned
  • Sensor failed electrically (open/short or out-of-spec output)
  • Loose or missing mounting hardware causing improper air gap

Fault status

⚠️ Status
Acceleration sensor (Tire 4) circuit malfunction or invalid signal detected. ABS/ESC/traction systems may be disabled until fault is resolved.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

Similar codes

C0035 C0040 C0210 C1231 C1298
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