Test sequence

• Switch off ignition.
• Remove wiper arms and plenum chamber cover.

  See Plenum Cover Emoval & Installation .

• Connect test box VAG 1598/31 to the engine control module. The control module wiring harness is not connected by this action.
• Check centralized matching resistor in engine control module.
• Perform a resistance measurement between test box sockets:
  • Sockets 6 + 7

  Specification: 60 to 72 Ω

If the resistance value is outside the specified range: 

• See DIESEL DIRECT FUEL INJECTION (DFI) ENGINE CONTROL MODULE (ECM) -J248-, REPLACING .

  If the resistance value is within the specified range: 

• Repair the malfunction in the wiring using wiring diagram.