How to Remove Engine Wiring Harness W2 and W3 for MTU 12-16v4000 Engine

If the MTU engine wiring harness W2 and W3 is damaged or has reached the end of its life, it should be replaced with a new one. Here is the step-by-step removal guide:

Required Tools

  • Pliers
  • Screwdriver

Step-by-Step Removal Guide

Step 1: Identify the Wiring Harness

  1. Label Set: Use the label set near the ECU connector to identify the wire harness and determine the cable route.

Step 2: Disconnect ECU Connector

  1. Loosen Bayonet Connector: Loosen the bayonet connector of the ECU 4 using pliers if necessary and pull it out.

Step 3: Disconnect Sensors and Actuators

  1. Remove Plug Connections: Disconnect and remove the plug connections of any connected sensors or actuators.

Step 4: Remove Cable Clamps

  1. Remove Cable Clamp: Remove the cable clamp (1) attached to the cable harness (2) to be replaced.
  2. Note Position: Note the position of the cable clamps as they must be reinstalled in the same position during reassembly.

Step 5: Open and Remove Cable Fasteners

  1. Open Locking Clips: Use a screwdriver to open and remove the locking clips (1) of all cable fasteners (2).
  2. Remove Wire Harness: Pull the wire harness (3) out of all open cable fasteners carefully.

Step 6: Disconnect Cylinder Head Cover

  1. Loosen Cable Connection: Loosen the cable connection (1) and pull it out from the injector (2).
  2. Loosen Cable Entry: Loosen the cable entry (3) and carefully pull the connection cable out of the cable entry.
  3. Disconnect Wire Harness: Disconnect the wire harness.

Additional Notes

  • Care During Removal: Handle the wire harness with care to avoid damage to other components.
  • Reinstallation: During reinstallation, ensure that all clamps and connectors are placed back in their original positions.

Related Resources

By following these steps, you can safely remove the engine wiring harness W2 and W3 from your MTU 12-16v4000 engine.

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