The Ford Fiesta CV21 ABS pump refers to the ABS (Anti-lock Braking System) pump module used in certain Ford Fiesta models, typically around the 2011–2017 production years, particularly for variants built on the B-platform (like the Mk7) and coded under CV21 (a common part prefix for right-hand-drive vehicles).

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Ford Fiesta CV21 ABS Pump Description:

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Part Overview:

• Component: ABS Pump & Module Assembly
• Part Code Prefix: CV21-2C405-, CV21-2C219-, or similar
• Vehicles: Ford Fiesta Mk7 / Mk7.5 (approx. 2011–2017)
• Drive Type: Front-wheel drive
• Brake System: With or without traction control (varies by spec)

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Technical Specs:

• ABS Module Type: Bosch 8.0 or Bosch 9.0 (varies by year/variant)
• Functions:
  
• Anti-lock braking
• Electronic Brakeforce Distribution (EBD)
• Traction Control System (TCS)
• Sometimes includes ESC (Electronic Stability Control)
• 
  
• Pump Motor: 12V electric motor
• Hydraulic block: Integrated with solenoid valves and pressure modulators
• Communication: Connected via CAN Bus to ECU and BCM
• Sensors Linked: Wheel speed sensors (4x), yaw sensor (if ESC)

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Common Issues:

• Faulty internal pressure sensor
• Wheel speed sensor circuit errors
• Pump motor not activating
• CAN communication failure (may require reprogramming or replacement)

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Connector Pins:

• Multi-pin connector (typically 26–38 pins depending on the system version)
• Power, ground, CAN High/Low, sensor inputs

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Fitment Note:

Always match CV21 part numbers exactly (e.g., CV21-2C405-AF) when replacing to ensure compatibility. Programming may be required after replacement using Ford IDS or equivalent tools.

If you have a specific part number (e.g., CV21-2C405-AE), I can give you an exact breakdown. Let me know!