Camshaft Position (CMP) sensor -G40-, checking: Checking

• Disconnect 3-pin harness connector from Camshaft Position (CMP) sensor -G40-.
  Fig 1: Identifying Harness Connector Terminals Of Camshaft Position (CMP) Sensor G40

  
• Connect multimeter US1119 (Fluke 83 or equivalent) to measure voltage across CMP connector terminals 1 (B+) and 3 (Ground), using adapters from VW1594 connector test kit.
• Switch ignition on.
• Measure voltage between terminals 1 and 3.

  Specified value: 9.0 to 14.5 volts

• Switch ignition off.

If voltage is OK:

• Connect VAG1598/22 test box to Motronic ECM harness connector. See VAG1598/22 TEST BOX, CONNECTING .
• Check wiring for open circuit between ECM/test box and 3 -pin harness connector, according to wiring diagram.
  • Connector terminal 1 to ECM/test box socket 11
  • Connector terminal 2 to ECM/test box socket 44
  • Connector terminal 3 to ECM/test box socket 14
  • Specified value: max. 1.5 Ω
  Fig 2: Identifying Harness Connector Terminals Of Camshaft Position (CMP) Sensor G40

  
• Check wiring for short circuit between ECM/test box and 3 -pin harness connector, according to wiring diagram.
  • Connector terminal 3 to ECM/test box socket 44
  • Connector terminal 3 to ECM/test box socket 11
  • Connector terminal 2 to ECM/test box socket 11
  • Specified value: INIFINITY Ω

If wiring is OK (and voltage across terminals 1 and 3 is OK):

• Replace Camshaft Position (CMP) sensor -G40-.

If wiring is OK (but still no voltage across terminals 1 and 3):

• Replace Motronic ECM -J220-. See ENGINE CONTROL MODULE (ECM) (WITHOUT METAL ANTI-THEFT HOUSING), REMOVING AND INSTALLING .
• Perform adaptation of throttle valve control module to ECM. See THROTTLE VALVE CONTROL MODULE, ADAPTATION TO ENGINE CONTROL MODULE (ECM) .
• Check readiness code. See READINESS CODE .
• If Diagnostic Trouble Code (DTC) memory has been erased, or ECM has been disconnected, generate new readiness code. See READINESS CODE, CHECKING .