Checking the 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 air conditioning (A/C) pressure 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 #14 and air conditioning (A/C) pressure sensor terminal 2. Check for an intermittent short-circuit to ground according to Short-circuit to ground, intermittent faults .

Check the power supply cable between engine control module (ECM) terminal #74 and air conditioning (A/C) pressure sensor terminal 3. Check for an intermittent open-circuit according to Open-circuit, intermittent faults .

Remedy as necessary.

HINT: The diagnostic trouble code (DTC) may be caused by low temperatures despite there being no faults.

Other information:

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

Fig 1: Identifying Knock Sensor (KS) 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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