Checking Quantity Adjuster N146

• Press → button.
• Press buttons 0 and 6 for the "End data transfer" function and confirm input with the Q button.
• Switch off ignition.

Fig 1: Identifying Fuel Cut-off Valve Connector

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• Disconnect 10-pin connector from quantity adjuster (connector to injection pump) - arrow  -.

Fig 2: 10-Pin Connector & Terminals

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• Measure resistance between connector terminals 5+6.

Specification: 0.5 to 2.5 Ω

If specification is not obtained:

• Replace injection pump → Injection pump, removing and installing  .
• Check DTC memory and, if necessary, repair any malfunctions and then erase → Diagnostic Trouble Code (DTC) memory, checking and erasing  .
• Read-out the readiness code → Reading readiness code  . If the DTC memory has been erased, the readiness code must be generated again → Readiness code, setting  .

If specification is obtained:

• Remove wiper arms and plenum cover: → 92 WINDSHIELD WIPER & WASHER SYSTEM

Fig 3: Identifying Test Box V.A.G 1598/31 Connected To Control Module Wiring Harness

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• Connect test box VAG1598/31 to control module wiring harness.

Fig 4: 10-Pin Electrical Harness Connector & Terminals

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• Check wiring between test box and connector for open circuit according to wiring diagram.

Terminal 5 + sockets 1 and 2

Terminal 6 + sockets 121 and 116

Wire resistance: max. 1.5 Ω

• Check wires for short to one another, to vehicle Ground and to battery positive (B+).

Specification: ∞Ω

If wiring and the resistance measurement values are OK:

• Replace Diesel Direct Fuel Injection Engine Control Module J248 → Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) J248 , replacing  .