LM - New Range RoverLS - Range Rover SportTitle AJV8 4.2 Supercharger Auxiliary Coolant PumpLast Modified 14-MAY-2009 17:09Category EngineSymptom 402000 Cooling System ConcernsContentIssue: Supercharger auxiliary coolant pump concerns. The customer may complain of reduced power and or a misfire at high engine loads and road speeds.Cause:1) If in the following vin ranges 6A198058-7A261419 (LM Range Rover) 5A901924 - 7A109767 (LS Range Rover Sport) then please refer to Technical Bulletin LTB00041v2.2) A concern may exist where the supercharger auxiliary coolant pump is found to be not running, this could be due to internal motor brush wear. This issue was rectified from VIN numbers 8A290432 (LM Range Rover) and 8A181100 (LS Range Rover Sport).Procedure for replacing the supercharger coolant pump can be found in Global Technical Reference (GTR) under section 303-03D – Supercharger Cooling. Repair Time 26.50.26 – Auxiliary coolant pump (AJV8 supercharged) – renew – 0.80hrsAction: Please renew the supercharger auxiliary coolant pump as necessary, part number PEB500010.
Most of the time, the issue was the Supercharger coolant aux coolant pump was wired in reverse as in the connector was flipped as in + and - was flipped !
Other than this AFAIK there really isn't anything that comes to mind