Golf L4-1.9L DSL Turbo (BEW) (2004)
Diesel MFI Pump: Testing and Inspection
Modulating Piston Displacement Sensor, Quantity Adjuster, Check
Modulating Piston Displacement Sensor And Quantity Adjuster, Checking
The quantity adjuster is an electro-magnetic swivelling positioner which is controlled by the ECM via a directed duty cycle. The eccentric shaft on the
quantity adjuster moves the modulating piston on the high pressure piston thereby regulating the quantity of fuel injected.
The modulating piston displacement sensor informs the ECM of the position of Quantity Adjuster -N146- therefore determining the amount injected.
NOTE: Use only gold-plated terminals when servicing terminals in harness connector to injection pump quantity adjuster.
Recommended special tools and equipment
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VAG1526 multimeter or VAG1715 multimeter
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VAG1594 connector test kit
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Wiring diagram
Test requirement
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The respective fuses of Diesel-Direct fuel injection system must be OK.
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Battery voltage must be at least 11.5 Volts.
Test sequence
Modulating Piston Displacement Sensor -G149-, checking
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Disconnect 10-pin harness connector for quantity adjuster (harness connector to injection pump quantity adjuster) -arrow-.