Replace the Faulty Fuel Injector or Pumping Unit

Safety Precautions: Ensure the engine is cool, the ignition is off, and the battery is disconnected. Wear appropriate eye and hand protection to prevent exposure to high-pressure fuel.

Tools Required: DAF-compatible diagnostic tool (DAVIE XD or Jaltest), fuel system service tools, torque wrench, and new genuine DAF injector or pumping unit.

1. Relieve the fuel system pressure according to the DAF workshop manual.
2. Access the valve cover to expose the fuel injector and pumping unit assembly for the identified cylinder.
3. Disconnect the electrical harness connector from the faulty injector or pumping unit solenoid.
4. Remove the high-pressure fuel lines and the securing bolts for the faulty component.
5. Carefully extract the faulty injector or pumping unit, ensuring no debris enters the fuel gallery.
6. Install the new component, ensuring all O-rings and seals are lubricated with clean engine oil and seated correctly.
7. Tighten the securing bolts to the manufacturer-specified torque settings using a calibrated torque wrench.
8. Reconnect the electrical harness and re-install the fuel lines, tightening to specification.
9. Use the diagnostic tool to perform a component registration or calibration if required by the ECU software version.
10. Clear all active and stored fault codes (P0269, P0270, P0271, or P0272) using the diagnostic tool.
11. Start the engine, allow it to reach operating temperature, and perform a final Cylinder Balance Test to verify that the fuel correction values for the replaced cylinder have returned to the normal operating range.