Checking wiring and connectors

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.

Fig 1: Identifying Ignition OFF

Courtesy of VOLVO CARS OF NORTH AMERICA.

Ignition off
Check the front heated oxygen sensor (HO2S) connector for contact resistance and oxidation according to Contact resistance and oxidation .
Check the cable between control module terminal #63 and heated oxygen sensor (HO2S) connector terminal #2. Check for an intermittent short-circuit to ground according to Short-circuit to ground, intermittent faults .

Remedy as necessary.

Other information
- To connect the breakout box and access the control module, see Connecting the breakout box. EMS 2000
- To access or replace the front heated oxygen sensor (HO2S), see Replacing lambda sonde front
- For information about signals see Signal specification .
Fig 2: Identifying Heated Oxygen Sensor (HO2S) Connector Terminals
Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying Ohmmeter
Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 4: Identifying EMS2000
Courtesy of VOLVO CARS OF NORTH AMERICA.

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