Checking wiring

WARNING: This page is about a different car, the 2004 Volvo S40, 2003 Volvo S40, 2002 Volvo S40, 2001 Volvo S40, and 2000 Volvo S40. However, it is still accessible from the selected car via links, so may be relevant.

Check the engine control module (ECM) and atmospheric pressure sensor connectors 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 18 and atmospheric pressure sensor terminal 3 for an intermittent short-circuit to ground. Remedy according to Short-circuit to ground, intermittent faults and for an intermittent open-circuit according to Open-circuit, intermittent faults .

Check the voltage cable between engine control module (ECM) connector terminal 78 and atmospheric pressure sensor terminal 1 for an intermittent open-circuit. Remedy according to Open-circuit, intermittent faults .

The supply voltage should be 5 V.

Other information:

To connect the breakout box, see Connecting the breakout box. EMS 2000
To replace the atmospheric pressure sensor, see Replacing the air conditioning (A/C) system pressure sensor .

Fig 1: Identifying Atmospheric Pressure Sensor Connector Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Ohmmeter

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: EMS2000

Courtesy of VOLVO CARS OF NORTH AMERICA.

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