Code
C1155
LAND ROVER
C — Chassis
Wheel speed sensor input circuit failure left front
Views:
UK: 12
EN: 24
RU: 17
AI status
Completed
Completed
100%
Causes
- Damaged or disconnected left front wheel speed sensor
- Broken, shorted, corroded or chafed wiring or connector on left front sensor circuit
- Contaminated, corroded or loose sensor connector terminals
- Faulty wheel speed sensor tone ring (missing teeth, excessive runout)
- Poor grounding or supply voltage to an active (powered) sensor
- Faulty ABS/traction control module or internal connector fault
Symptoms
- ABS, traction control and/or stability control warning lamp illuminated
- ABS or traction control intervention disabled or behaves incorrectly
- Cruise control may be disabled
- Possible ABS pump or warning events during braking or cornering
- Diagnostic trouble code stored for left front wheel speed sensor
What to check
- Scan ABS/TC module, read stored/frozen DTC data and freeze frame
- Perform visual inspection of left front sensor, connector and wiring for damage or corrosion
- Check connector mating surfaces for water intrusion or bent pins
- Wiggle wiring harness while monitoring live wheel speed data to detect intermittent faults
- Measure sensor resistance and/or output signal with the wheel off the ground
- Inspect tone ring/reluctor on hub/axle for missing/damaged teeth or heavy contamination
Signal parameters
- Passive (magnetic) sensor: DC resistance typically in the hundreds to low thousands of ohms (vehicle-specific). Produces AC voltage that rises with wheel speed (≈0.1–2.0 VAC at low speed, increases with RPM).
- Active (Hall/VR powered) sensor: reference supply usually ~5 V (or vehicle-specific), square-wave or digital pulse output 0–5 V (or 0–12 V on some systems) with frequency proportional to wheel speed.
- At idle with wheel rotated by hand: passive sensor should produce small AC pulses; active sensor should produce clean pulses referenced to supply voltage.
- Open-circuit or short-to-ground/short-to-B+ will show infinite/very low resistance or constant voltage respectively.
Diagnostic algorithm
- Record fault: Use a scan tool to read C1155, note freeze frame and related ABS/traction codes. Clear code and perform initial road test to see if code returns.
- Visual: With vehicle safe and secure (handbrake, chocked, ignition off), inspect left front wheel area, sensor mounting, tone ring, wiring and connector for damage, contamination or corrosion.
- Connector: Disconnect the sensor connector. Check for corrosion, bent pins, water ingress. Clean and reseat connector; if terminals are loose or corroded, repair or replace.
- Resistance/continuity: Measure sensor resistance (if passive) and compare to specification. For active sensors, check reference supply and ground at connector with ignition on. Check continuity from sensor connector to ABS module pins.
- Signal output: With wheel off ground and rotated by hand (or driven safely), measure AC voltage (passive) or digital pulse (active) at sensor connector using oscilloscope or multimeter frequency/AC range while monitoring wheel speed live data on scan tool.
- Wiggle test: With wiring harness accessible, wiggle harness and connectors while watching live data/voltage for intermittent faults.
- Tone ring inspection: Check reluctor ring for missing teeth, heavy rust/metal buildup, or excessive runout. Repair/replace as necessary; clean if contaminated.
- Repair: If short/open or bad connector found, repair wiring with proper terminals, heat shrink and corrosion protection. Replace sensor if out of spec or no output. Replace tone ring if damaged.
- Module check: If wiring and sensor test good but code remains, inspect ABS module connector and pins. Consider substitution/bench testing of ABS module only after wiring and sensors are verified fault-free.
- Verify: Clear codes, perform road test and re-scan to ensure the fault does not return and ABS/traction lamp is extinguished.
Likely causes
- Water intrusion/corrosion at left front wheel speed sensor connector
- Wire harness damage near wheel (exposed by steering/suspension movement)
- Sensor knocked out of position or contaminated by debris/metallic particles
- Open or shorted sensor lead to ABS module (pin damage or chafed wiring)
- Failed left front wheel speed sensor (internal short or open)
Fault status
Status
Left front wheel speed sensor input circuit fault detected. ABS/traction control fault stored; system may disable ABS/traction functions until fault is resolved.
Repair difficulty: Medium
Diagnostic time: 0.5 - 2.0 hours
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Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
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Code
C1155
Other
C — Chassis
Speed Wheel Sensor LF Input Circuit Failure
Views:
UK: 28
EN: 46
RU: 30
AI status
Completed
Completed
100%
Causes
- Damaged or disconnected left front wheel speed sensor
- Broken, shorted, corroded or chafed wiring or connector on left front sensor circuit
- Contaminated, corroded or loose sensor connector terminals
- Faulty wheel speed sensor tone ring (missing teeth, excessive runout)
- Poor grounding or supply voltage to an active (powered) sensor
- Faulty ABS/traction control module or internal connector fault
Symptoms
- ABS, traction control and/or stability control warning lamp illuminated
- ABS or traction control intervention disabled or behaves incorrectly
- Cruise control may be disabled
- Possible ABS pump or warning events during braking or cornering
- Diagnostic trouble code stored for left front wheel speed sensor
What to check
- Scan ABS/TC module, read stored/frozen DTC data and freeze frame
- Perform visual inspection of left front sensor, connector and wiring for damage or corrosion
- Check connector mating surfaces for water intrusion or bent pins
- Wiggle wiring harness while monitoring live wheel speed data to detect intermittent faults
- Measure sensor resistance and/or output signal with the wheel off the ground
- Inspect tone ring/reluctor on hub/axle for missing/damaged teeth or heavy contamination
Signal parameters
- Passive (magnetic) sensor: DC resistance typically in the hundreds to low thousands of ohms (vehicle-specific). Produces AC voltage that rises with wheel speed (≈0.1–2.0 VAC at low speed, increases with RPM).
- Active (Hall/VR powered) sensor: reference supply usually ~5 V (or vehicle-specific), square-wave or digital pulse output 0–5 V (or 0–12 V on some systems) with frequency proportional to wheel speed.
- At idle with wheel rotated by hand: passive sensor should produce small AC pulses; active sensor should produce clean pulses referenced to supply voltage.
- Open-circuit or short-to-ground/short-to-B+ will show infinite/very low resistance or constant voltage respectively.
Diagnostic algorithm
- Record fault: Use a scan tool to read C1155, note freeze frame and related ABS/traction codes. Clear code and perform initial road test to see if code returns.
- Visual: With vehicle safe and secure (handbrake, chocked, ignition off), inspect left front wheel area, sensor mounting, tone ring, wiring and connector for damage, contamination or corrosion.
- Connector: Disconnect the sensor connector. Check for corrosion, bent pins, water ingress. Clean and reseat connector; if terminals are loose or corroded, repair or replace.
- Resistance/continuity: Measure sensor resistance (if passive) and compare to specification. For active sensors, check reference supply and ground at connector with ignition on. Check continuity from sensor connector to ABS module pins.
- Signal output: With wheel off ground and rotated by hand (or driven safely), measure AC voltage (passive) or digital pulse (active) at sensor connector using oscilloscope or multimeter frequency/AC range while monitoring wheel speed live data on scan tool.
- Wiggle test: With wiring harness accessible, wiggle harness and connectors while watching live data/voltage for intermittent faults.
- Tone ring inspection: Check reluctor ring for missing teeth, heavy rust/metal buildup, or excessive runout. Repair/replace as necessary; clean if contaminated.
- Repair: If short/open or bad connector found, repair wiring with proper terminals, heat shrink and corrosion protection. Replace sensor if out of spec or no output. Replace tone ring if damaged.
- Module check: If wiring and sensor test good but code remains, inspect ABS module connector and pins. Consider substitution/bench testing of ABS module only after wiring and sensors are verified fault-free.
- Verify: Clear codes, perform road test and re-scan to ensure the fault does not return and ABS/traction lamp is extinguished.
Likely causes
- Water intrusion/corrosion at left front wheel speed sensor connector
- Wire harness damage near wheel (exposed by steering/suspension movement)
- Sensor knocked out of position or contaminated by debris/metallic particles
- Open or shorted sensor lead to ABS module (pin damage or chafed wiring)
- Failed left front wheel speed sensor (internal short or open)
Fault status
Status
Left front wheel speed sensor input circuit fault detected. ABS/traction control fault stored; system may disable ABS/traction functions until fault is resolved.
Repair difficulty: Medium
Diagnostic time: 0.5 - 2.0 hours
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Your experience will help others
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Was this AI description helpful?
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👍 Like
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0
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