The ABS pump in a Toyota Vellfire 20 series (ANH20, model years around 2008–2014), particularly the XZ variant, is part of the ABS (Anti-lock Braking System) actuator assembly. It plays a critical role in preventing wheel lock-up during hard braking, enhancing vehicle control.

ABS Pump (Actuator) Description:

• Location: Engine bay, typically mounted on the driver’s side, near the brake master cylinder.
• Function:
  
• Regulates brake pressure to individual wheels during emergency braking.
• Works with wheel speed sensors, the ABS control module, and brake lines.
• Incorporates solenoid valves and a hydraulic motor/pump to modulate pressure.
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• Structure:
  
• Aluminum body housing internal solenoids and hydraulic channels.
• Electronic Control Unit (ECU) often integrated with the hydraulic block in some versions.
• Multiple brake lines connected for front and rear wheels.
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Common Issues:

• ABS warning light staying on.
• Brake fluid leaks.
• Unusual noises during braking.
• Diagnostic codes such as C1251, C0278, or others pointing to the ABS actuator.

Would you like a diagram or part number reference for this specific pump?