C0031 - Chassis Fault Code C0031 - ABS / Bromssystem (Hjulhastighetssensorer & Ventiler)
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System
Chassis (Brakes, Steering, Suspension)
Related Fault Codes
Chassis Fault Code C0001 - ABS / Bromssystem (Hjulhastighetssensorer & Ventiler)
Chassis Fault Code C0002 - ABS / Bromssystem (Hjulhastighetssensorer & Ventiler)
Chassis Fault Code C0003 - ABS / Bromssystem (Hjulhastighetssensorer & Ventiler)
Chassis Fault Code C0004 - ABS / Bromssystem (Hjulhastighetssensorer & Ventiler)
Technical Description
DTC C0031 indicates an electrical circuit fault, signal performance degradation, or missing pulse stream from the Left Front Wheel Speed Sensor. In modern active current-loop sensors (Hall/AMR), the ABS ECU supplies power and evaluates wheel speed by detecting switching current levels (nominally 7mA logic low / 14mA logic high). The DTC triggers on open circuit, short to power/ground, incorrect air gap, tone ring damage (magnetic encoder seal), or plausibility mismatch across wheels.
Possible Causes
1. Skadat kablage eller korroderat kontaktdon i hjulhuset p.g.a. dynamisk fjädringsrörelse och fukt/vägsalt.
2. Skadad eller smutsig magnetisk pulsgivarring (integrerad i hjullagrets packbox) alternativt rost/sprickor i tandhjul.
3. Defekt intern givarelektronik (Hall-element / avbrott i givarens interna spole).
4. Felaktigt luftgap (air gap) mellan sensor och magnetring p.g.a. rost under sensorfästet eller felpressat hjullager.
5. Internt hårdvarufel i ABS/ESP-styrenhetens ingångssteg.
Recommended Solution
Workflow
Mechanic's Tip
Before replacing expensive components, always double-check wiring and connections. 80% of all sensor faults are actually due to corroded contacts or broken wires.
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