Volvo Engine Repair Instructions Magnetically controlled proportional valve (MPROP) A magnetically controlled proportional valve (MPROP) controls the high pressure pump to ensure that the correct fuel pressure (rail pressure) is retained despite varying engine speed and loading. The input signal to the valve is a PWM signal whose pulse width is controlled by the engine control module. When the current through the valve is changed, this affects the fuel flow, which results in changed rail pressure. Water in fuel switch, secondary fuel filter A switch is located in the water trap under the fuel filter. Its task is to detect whether there is water in the fuel. The switch senses the resistance between two pins, wich are in contact with the fuel. When there is no water in the fuel, the resistance is very high. If there is any water in the fuel, the resistance falls. Switch, coolant level The task of the switch is to discover whether the coolant level in...
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