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Home >> Volkswagen >> 2000 >> Jetta GL, 1.9 F, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> 1.9L - TDI And TDI Pd Generic Scan Tool, Engine Code(S): ALH, BEW (A4 Platform) >> 23 Diesel Fuel Injection >> Checking components >> Modulating Piston Displacement Sensor and quantity adjuster, checking >> Notes

Modulating Piston Displacement Sensor and quantity adjuster, checking: Notes

Only vehicles with engine code ALH 

The quantity adjuster is an electro-magnetic swiveling 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- there determines 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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