volkswagen Workshop Repair Guides

Volkswagen Workshop Service and Repair Manuals

Modulating Piston Displacement Sensor and Quantity Adjuster|Page 2069 > < Modulating Piston Displacement Sensor and Quantity Adjuster
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Disconnect fuel temperature sensor harness connector (connection to fuel pump Quantity Adjuster)

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Measure resistance between connector terminals: 1 + 2 and 2 + 3
Specification: 5 to 7 Ohms

If specification not obtained:
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Replace injection pump

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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 VAG 1598/18 Test Box to ECM harness connector

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Check wiring for open circuit between Test Box and connector using wiring diagram:
terminal 1 + socket 29
terminal 2 + socket 7
terminal 3 + socket 52
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

If DTC memory was erased:
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Create readiness code again

Quantity Adjuster N146 Checking:

Modulating Piston Displacement Sensor and Quantity Adjuster|Page 2069 > < Modulating Piston Displacement Sensor and Quantity Adjuster