Checking wiring

Check the engine control module (ECM) and mass air flow (MAF) sensor connectors. Check for contact resistance and oxidation according to Contact resistance and oxidation .

Check in particular for damage or loose terminal pins.

Check the signal cable between engine control module (ECM) terminal #16 and mass air flow (MAF) sensor terminal #2. Check for an intermittent short-circuit to supply voltage according to Short-circuit to supply voltage, intermittent faults . Remedy if necessary.

Check the ground lead between engine control module (ECM) terminal #15 and mass air flow (MAF) sensor terminal #1. Check for an intermittent short-circuit to supply voltage according to Short-circuit to supply voltage, intermittent faults . Remedy if necessary.

Other information: 

• To connect the breakout box, see Connecting the breakout box. EMS 2000 .

Fig 1: Identifying Mass Air Flow (MAF) Sensor Connector Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Ohmmeter

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying EMS2000

Courtesy of VOLVO CARS OF NORTH AMERICA.

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