JLR (Jaguar Land Rover) is investigating an issue on AJ21 D4M powered vehicles. Customers are experiencing issues with FEAD primary belt failure which could lead to a flat battery and possibly an oil leak. The belt tensioner becomes temporarily stuck and the belt snaps during an engine start. Replace the tensioner assembly and the drive belts at the same time using the appropriate service tool for the water pump belt. Residual diesel and/or oil from a previous leak may enter the tensioner and cause internal damage.
Main (primary) Fead belt...............T2H44393
Main Fead tensioner......................T2H52304
Water pump belt...........................T2H44394
A PCM software update will change the first engine start-up strategy. First engine start will use the starter motor and not the Belt Integrated Starter Generator (BISG). Complete the software update for the belt/tensioner causes. This procedure requires a minimum of Pathfinder 340 with the latest software.
1. Connect the JLR approved battery support unit.
2. Connect the JLR approved diagnostic equipment to the vehicle and begin a new session.
3. Follow the diagnostic equipment prompts.
4. Select “ECU Diagnostics”.
5. Select “Powertrain Control Module”.
6. Select “Update ECU”.
7. Follow all on-screen instructions to complete the task.
8. Exit the session and disconnect the diagnostic equipment.
