Code
C1552
MITSUBISHI
C — Chassis
Hall-IC output pattern
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EN: 16
RU: 12
AI status
Completed
Completed
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Causes
- Damaged or failed Hall-effect sensor (internal fault)
- Broken, shorted, or corroded wiring or connector between sensor and control unit
- Incorrect air gap or physical damage to reluctor/tone ring (missing teeth, heavy corrosion, or debris)
- Poor sensor supply or ground (voltage reference problem)
- Intermittent connections due to corrosion, bent pins or water ingress
- Electromagnetic interference or nearby magnetic contamination
Symptoms
- ABS and/or traction control (TCS) warning lamp illuminated
- Possible loss of ABS/TCS functionality; warning light remains on
- Inconsistent or incorrect wheel speed readings on scan tool
- Vehicle stability control interventions may be disabled or behave erratically
- Possible speedometer or cruise control erratic behavior (if tied to same sensor)
- Braking feel may be normal but ABS operation may not engage when expected
What to check
- Read and record freeze-frame data and stored ABS/wheel speed values with a scan tool
- Visually inspect sensor, connector, and wiring for damage, corrosion, or disconnection
- Check connector pins for dirt, corrosion, bent pins and proper locking
- Backprobe sensor connector to verify reference supply voltage and ground with ignition on
- Measure sensor output with a multimeter while rotating the wheel (some sensors will show pulsed DC)
- Preferably check sensor waveform with an oscilloscope while rotating the wheel to confirm pulse shape, amplitude and frequency
Signal parameters
- Signal type: digital square pulses from Hall-effect sensor (open-collector or push-pull depending on design)
- Typical idle/no-rotation level: pulled high to reference (varies by vehicle; commonly 0–5 V or 0–12 V depending on system)
- Typical active level: pulses switching to ground (0 V) or low voltage with amplitude up to vehicle reference (commonly 5 V; some systems use pull-up to battery)
- Duty cycle: often near 50% but can vary with reluctor geometry
- Frequency: proportional to wheel/shaft speed — low Hz at crawl speeds, increasing to several hundred Hz at road speeds
- Acceptable waveform: consistent, regularly spaced pulses with clean transitions and stable amplitude; missing pulses, excessive jitter, or noisy baseline indicates a problem
Diagnostic algorithm
- Verify the trouble code and note any additional ABS or wheel speed codes. Clear the code and perform a test drive to confirm reappearance.
- Using a scan tool, monitor all wheel speed sensor readings at low speed and check for a sensor that shows no or inconsistent pulses compared with other wheels.
- Visually inspect the suspect sensor, wiring, and connector for damage, corrosion, broken insulation, or pin problems. Repair or clean as needed.
- Backprobe the sensor connector: with ignition ON, verify the sensor reference supply (if applicable) and good ground. Reference voltage should match manufacturer spec (commonly 5 V or vehicle battery via pull-up).
- With wheel lifted safely, spin the wheel by hand and observe the sensor output with an oscilloscope. Look for clean, regular square pulses. If no oscilloscope is available, use a multimeter to check for pulsed DC or resistance (if applicable).
- Inspect the tone/reluctor ring for missing teeth, heavy corrosion, or loose mounting. Check sensor-to-reluctor air gap and adjust to spec or replace components if out of tolerance.
- Perform a wiggle test on the harness and connectors while monitoring the waveform or scan tool to locate intermittent faults.
- If wiring and sensor test good, inspect ECU/ABS module input circuit and grounds. Compare measurements at sensor connector and ECU connector to locate open/short between.
- Replace the faulty sensor or repair wiring as indicated, reassemble, clear codes, and road test to confirm the code does not return and system functions correctly.
Likely causes
- Wiring harness chafed at suspension or steering points causing intermittent short/open
- Connector contamination/corrosion at sensor or ECU
- Sensor reluctor ring damaged or magnetized debris stuck to sensor
- Sensor air gap out of specification after service or wheel bearing collapse
- Sensor internal failure due to moisture ingress or impact
Fault status
Status
Stored when the control module detects the Hall-effect sensor’s output waveform is missing, intermittent, distorted or outside expected voltage/frequency parameters — indicating a sensor, wiring, reluctor/tone ring or input circuit issue.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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