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Home >> Mazda >> 2021 >> 3 Base >> Repair and Diagnosis (Single Page) >> Brakes >> Traction Control >> On-Board Diagnostics - Dynamic Stability Control (DSC) >> DTC C0020-11, C0020-12, C0020-13, C0020-49 Or C0020-71: Pump Motor, Pump Relay [DSC HU/Cm] >> Outline

DTC C0020-11, C0020-12, C0020-13, C0020-49 Or C0020-71: Pump Motor, Pump Relay [DSC HU/Cm]: Outline

DTC C0020:11, C0020:12, C0020:13, C0020:49 OR C0020:71 (DSC HU/CM) DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location Pump motor, pump relay
Detection condition
  • C0020:11
    • The motor relay signal does not correspond to the DSC HU/CM ON signal.
  • C0020:12
    • The motor monitor signal does not correspond to the DSC HU/CM OFF signal.
  • C0020:13
    • A condition is detected in which the motor relay voltage is less than the specification while the DSC HU/CM controls the pump relay at on.
  • C0020:49
    • The DSC HU/CM detects a pump motor drive circuit malfunction.
  • C0020:71
    • The DSC HU/CM detects a voltage decrease occurring in the pump motor after the pump motor operates.
Fail-safe Refer to "DTC Table" and "Fail-safe Function Malfunction Contents Table". (See DTC TABLE [DSC HU/CM (US)] .)
Possible cause
  • DSC HU/CM connector or terminals malfunction
  • Short to ground or open circuit in DSC HU/CM power supply circuit
  • Open circuit in DSC HU/CM ground circuit
  • DSC HU/CM malfunction
    • Pump motor stuck, open circuit, short circuit to ground, or short circuit to power supply
      • Motor relay stuck, open circuit, short circuit to ground, or short circuit to power supply
G13715027Courtesy of MAZDA MOTORS CORP.
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