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Home >> Land Rover >> 2022 >> Range Rover Sport HST >> Repair and Diagnosis >> Engine Mechanical >> Cooling System (Mechanical) >> Engine Cooling - INGENIUM I6 3.0L Petrol -- Range Rover Sport/L494 >> Engine Cooling - INGENIUM I6 3.0L Petrol (G2299956) >> Description And Operation >> Engine Cooling - INGENIUM I6 3.0L Petrol (G2353244) >> Description >> Variable Coolant Pump

Variable Coolant Pump

G14058174Courtesy of JAGUAR LAND ROVER NORTH AMERICA, LLC
ITEM DESCRIPTION
1 Electrical connector - Variable coolant pump shroud solenoid
2 Electrical connector - Variable coolant pump shroud position sensor
3 Pulley

The variable coolant pump is installed at the front left of the cylinder block. A pulley attaches to the pump flange. The ratio of crankshaft speed to variable coolant pump speed is 1:1.45.

For additional information, refer to: ACCESSORY DRIVE

The Powertrain Control Module (PCM) controls the variable coolant pump to give the minimum flow to support all cooling requests from the engine components. The variable coolant pump has a shroud inside that slides over the impeller to control the quantity of engine coolant pumped into the engine. The purpose is only to pump the minimum quantity of engine coolant necessary around the engine. This decreases the load on the engine and improves fuel consumption and emissions.

The micro-pump that is used to build pressure to actuate the shroud. The pressure is in turn controlled by the solenoid valve.

The PCM controls the variable coolant pump shroud solenoid with a Pulse Width Modulation (PWM) signal.

For additional information, refer to: ELECTRONIC ENGINE CONTROLS

Variable flow functionality is used during warm-up, contributing to the whole engine thermal management strategy. The internal pressure within the variable coolant pump acts against a return spring in the variable coolant pump housing. The variable coolant pump solenoid is open without a signal from the PCM. Therefore the variable coolant pump shroud returns to its base position under spring force, resulting in full flow from the variable coolant pump.

As components warm up, the flow request increases in 4 stages. The engine coolant flow control continues until the complete powertrain system, including the transmission, achieves its operating temperature.

The flow modes of the variable coolant pump are the following:

NOTE: Flow percentages are approximate values.
NOTE: If engine is not running, default shroud pump position is Level 4 or fully unshrouded (safety position).

The Powertrain Control Module (PCM) receives input signals from the following components to calculate the level of coolant flow required:

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