Checking the connector

Fig 1: Identifying Ignition Switch OFF Position

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• Ignition off
• Check the mass Air Flow (MAF) sensor connector for contact resistance and oxidation according to Contact resistance and oxidation .

  Remedy as necessary.

  Other information: 

  • To access or replace the mass air flow (MAF) sensor, see Replacing the mass air flow (MAF) sensor .
  Fig 2: Identifying Ohmmeter

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• Continue 

  Refer to Checking the connector 

Fig 1: Engine Start Verification

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Fig 2: Identifying Connector(s) Reinstallation

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• Ignition off
• Reinstall the components, reconnect the connectors etc.
• Start the engine. Allow the engine to idle
• Read off the mass air flow (MAF) sensor signal.

  Check that the signal is within its permitted range. Voltage at idling speed must be 1.5-1.8V.

  If the signal is now OK, the fault was caused by poor contact in the connector.

  Other information: 

  • To access and replace the mass air flow (MAF) sensor, see Replacing the mass air flow (MAF) sensor
  • For mass air flow (MAF) sensor table values, see Mass air flow (MAF) sensor .
  Fig 3: Identifying VCT2000 Diagnostic Tool

  Courtesy of VOLVO CARS OF NORTH AMERICA.

Is the signal OK? 

• YES 

  Refer to Verification 

• NO 

  Refer to Checking the wiring and component