volkswagen Workshop Repair Guides

Volkswagen Workshop Service and Repair Manuals

Modulating Piston Displacement Sensor and Quantity Adjuster|Page 2073 > < Modulating Piston Displacement Sensor and Quantity Adjuster|Page 2071
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If specifications not obtained:
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Check start of injection valve as follows

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Press -> button

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Press 0 and 6 buttons to select function 06 "End data transfer"

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Press Q button to enter input

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Switch OFF ignition

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Disconnect Diesel injection pump harness connector

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Measure resistance between connector terminals 2 + 3:
Specification: 12 to 20 Ohms.

If specification not obtained:
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Replace start of injection valve N108

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Display the readiness code

If DTC memory was erased:
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Create readiness code again

If specification obtained:

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Connect Test Box VAG 1598/18 to ECM harness connector

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Check wiring for open circuit between Test Box and 3 pin connector using wiring diagram:
terminal 2 + socket 51 
terminal 3 + socket 68 
Wire resistance: max. 1.5 Ohms.

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Additionally check wires for short to one another
Specification: Infinite Ohms.

If wiring OK:
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Replace Diesel direct injection system ECM J248

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Display the readiness code

Modulating Piston Displacement Sensor and Quantity Adjuster|Page 2073 > < Modulating Piston Displacement Sensor and Quantity Adjuster|Page 2071