Code
C1311
Generic
C — Chassis
Wheel Speed Sensor Circuit Intermittent
Views:
UK: 1
EN: 0
RU: 0
AI status
Completed
Completed
100%
Causes
- Damaged or contaminated wheel speed sensor (magnetic/inductive or Hall-type)
- Chafed, broken or shorting wiring harness to the sensor
- Corroded, loose or water-intruded connector pins
- Damaged or missing tone/reluctor ring (broken teeth, heavy rust, debris)
- Faulty wheel bearing causing variable sensor air gap
- Poor ground or power supply for active sensors
Symptoms
- ABS and/or traction control warning lamp illuminated intermittently
- Intermittent loss of ABS or traction control functions
- Speedometer or cruise control erratic operation on some vehicles
- Brake pulsation or ABS activation at inappropriate times
- Codes set only under certain speeds or after road vibration
What to check
- Read freeze-frame/fault history with a scan tool and confirm C1311 is current/intermittent
- Visually inspect sensor, connector, wiring harness and tone ring for damage, corrosion, debris, or missing teeth
- Wiggle wiring and connector with key on while monitoring live wheel speed data to reproduce intermittent behavior
- Check sensor resistance/continuity (ohms) and compare to manufacturer specification
- For passive (inductive) sensors: measure AC voltage while rotating wheel; for active (Hall) sensors: probe supply (key on) and measure switching voltage or square wave with oscilloscope
- Backprobe power and ground for active sensors and check for intermittent supply or poor ground
Signal parameters
- Passive (inductive) sensor: resistance typically within manufacturer spec; produces an AC voltage that increases with wheel speed (often ~0.1–2.0 VAC at low speeds to several volts at higher speeds).
- Active (Hall/magnetic) sensor: should have stable supply voltage (often 5V or vehicle battery voltage depending on design) with a square-wave or pulse output switching between ~0–5V (or 0–Vbatt) proportional to wheel speed.
- Frequency of pulses should rise smoothly with wheel speed and not drop out or show irregular gaps.
- Continuity: sensor circuit should not show intermittent opens; short to ground or battery is a fault.
- Consult vehicle manufacturer specs for exact resistance, supply voltage and signal waveform requirements.
Diagnostic algorithm
- Confirm C1311 is present and note freeze-frame/snapshot data with a scan tool. Do not replace parts without data.
- Visually inspect the suspect wheel sensor, tone ring, wiring and connector. Repair obvious damage and clean corrosion/contamination.
- With ignition on, backprobe the sensor connector: verify reference supply and ground on active sensors; measure sensor resistance with connector disconnected and compare to spec.
- Spin the wheel or perform a controlled road test while monitoring live wheel speed sensor data. Wiggle the harness and connectors to try to reproduce the intermittent condition.
- For passive sensors, measure AC voltage while rotating hub; for active sensors, check the output waveform with an oscilloscope if available. Look for dropouts, noise, or irregular amplitude.
- Check tone/reluctor ring for missing/bent teeth, heavy corrosion or dirt; repair/replace if damaged. Ensure correct sensor air gap.
- Repair any wiring faults (splice, replace harness section, or replace connector) and secure harness away from pinch/chafing points.
- If sensor fails bench tests or waveforms are irregular, replace the sensor. Re-test after replacement.
- If problem persists after sensor and wiring replacement, inspect ABS module connectors and ground circuits. Consider module diagnosis or replacement only after wiring and sensor are verified good.
- Clear DTCs and perform final road test to ensure the intermittent condition is resolved and no reoccurrence.
Likely causes
- Corroded/loose connector at the wheel speed sensor (most common)
- Wiring harness damage at wheel (pinch points, inside wheel well)
- Contaminated or damaged tone/reluctor ring
- Failed sensor (intermittent internal failure)
- Intermittent power/ground to an active (powered) sensor
Fault status
Status
Intermittent wheel speed sensor circuit detected. Signal from the wheel speed sensor is unstable or drops out under certain conditions. Inspect sensor, tone ring, connectors and wiring; intermittent faults often indicate poor connection, damaged harness, or a failing sensor.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
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Code
C1311
MERCEDES-BENZ
C — Chassis
Switchover Solenoid Valve (Release) Open/Shorted
Views:
UK: 18
EN: 32
RU: 16
AI status
Completed
Completed
100%
Causes
- Damaged or contaminated wheel speed sensor (magnetic/inductive or Hall-type)
- Chafed, broken or shorting wiring harness to the sensor
- Corroded, loose or water-intruded connector pins
- Damaged or missing tone/reluctor ring (broken teeth, heavy rust, debris)
- Faulty wheel bearing causing variable sensor air gap
- Poor ground or power supply for active sensors
Symptoms
- ABS and/or traction control warning lamp illuminated intermittently
- Intermittent loss of ABS or traction control functions
- Speedometer or cruise control erratic operation on some vehicles
- Brake pulsation or ABS activation at inappropriate times
- Codes set only under certain speeds or after road vibration
What to check
- Read freeze-frame/fault history with a scan tool and confirm C1311 is current/intermittent
- Visually inspect sensor, connector, wiring harness and tone ring for damage, corrosion, debris, or missing teeth
- Wiggle wiring and connector with key on while monitoring live wheel speed data to reproduce intermittent behavior
- Check sensor resistance/continuity (ohms) and compare to manufacturer specification
- For passive (inductive) sensors: measure AC voltage while rotating wheel; for active (Hall) sensors: probe supply (key on) and measure switching voltage or square wave with oscilloscope
- Backprobe power and ground for active sensors and check for intermittent supply or poor ground
Signal parameters
- Passive (inductive) sensor: resistance typically within manufacturer spec; produces an AC voltage that increases with wheel speed (often ~0.1–2.0 VAC at low speeds to several volts at higher speeds).
- Active (Hall/magnetic) sensor: should have stable supply voltage (often 5V or vehicle battery voltage depending on design) with a square-wave or pulse output switching between ~0–5V (or 0–Vbatt) proportional to wheel speed.
- Frequency of pulses should rise smoothly with wheel speed and not drop out or show irregular gaps.
- Continuity: sensor circuit should not show intermittent opens; short to ground or battery is a fault.
- Consult vehicle manufacturer specs for exact resistance, supply voltage and signal waveform requirements.
Diagnostic algorithm
- Confirm C1311 is present and note freeze-frame/snapshot data with a scan tool. Do not replace parts without data.
- Visually inspect the suspect wheel sensor, tone ring, wiring and connector. Repair obvious damage and clean corrosion/contamination.
- With ignition on, backprobe the sensor connector: verify reference supply and ground on active sensors; measure sensor resistance with connector disconnected and compare to spec.
- Spin the wheel or perform a controlled road test while monitoring live wheel speed sensor data. Wiggle the harness and connectors to try to reproduce the intermittent condition.
- For passive sensors, measure AC voltage while rotating hub; for active sensors, check the output waveform with an oscilloscope if available. Look for dropouts, noise, or irregular amplitude.
- Check tone/reluctor ring for missing/bent teeth, heavy corrosion or dirt; repair/replace if damaged. Ensure correct sensor air gap.
- Repair any wiring faults (splice, replace harness section, or replace connector) and secure harness away from pinch/chafing points.
- If sensor fails bench tests or waveforms are irregular, replace the sensor. Re-test after replacement.
- If problem persists after sensor and wiring replacement, inspect ABS module connectors and ground circuits. Consider module diagnosis or replacement only after wiring and sensor are verified good.
- Clear DTCs and perform final road test to ensure the intermittent condition is resolved and no reoccurrence.
Likely causes
- Corroded/loose connector at the wheel speed sensor (most common)
- Wiring harness damage at wheel (pinch points, inside wheel well)
- Contaminated or damaged tone/reluctor ring
- Failed sensor (intermittent internal failure)
- Intermittent power/ground to an active (powered) sensor
Fault status
Status
Intermittent wheel speed sensor circuit detected. Signal from the wheel speed sensor is unstable or drops out under certain conditions. Inspect sensor, tone ring, connectors and wiring; intermittent faults often indicate poor connection, damaged harness, or a failing sensor.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
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