KV6 Variable Intake Manifold System (VIS) Motor Diagnostic Aid

This 'information only' bulletin has been issued to aid diagnosis and resolution of Diagnostic Trouble Codes (DTCs) related to valve actuator motors assembled to the air intake manifold of the KV6 engine. A noticeable change in engine performance or a 'rattle' noise coming from the intake manifold area during idle may be reported. The Variable Intake Manifold System (VIS) on the KV6 engine incorporates two actuator motors ('VIS Motors') that control the positions of internal flaps and butterfly valves which alter the volume and rate of air induction.
RESOLUTION: RESOLVE VIS MOTOR DTC, NOISE AND PERFORMANCE CONCERNS
This bulletin details procedures to determine that the VIS motors and internals of the intake manifold assembly are functioning correctly. Should a customer report a concern of a rattle noise heard from the intake manifold area during idle or a noticeable change in engine performance, refer to the Repair Procedure detailed in this bulletin to diagnose and resolve VIS motor DTCs and performance concerns.
NOTE: Land Rover service and parts literature, including MicroCat and TestBook/T4, use a range of descriptions for the two Variable Intake Manifold System (VIS) motors installed on the Freelander KV6 engine intake manifold. The part numbers and descriptions listed below and in Figure 1 should be cross-referenced with T4 and Table 1 for correct DTC diagnosis.

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