Checking connectors and wiring

CAUTION:

Do not apply rust solvent spray or grease to the heated oxygen sensor (HO2S) connector.

Check the heated oxygen sensor (HO2S) connector. Check for contact resistance and oxidation. Check for loose connections.

Check the signal cable (-) between heated oxygen sensor (HO2S) terminal #5 and control module terminal #A44 (#A44). Check the cable for calibration current between heated oxygen sensor (HO2S) terminal #2 and heated oxygen sensor (HO2S) terminal #A69 (#B9). Check for an intermittent open-circuit.

Check the cable for calibration current between heated oxygen sensor (HO2S) terminal #2 and control module terminal #A69 (#B9). Check the cable for pump current between heated oxygen sensor (HO2S) terminal #6 and control module terminal #A25 (#A25). Check for an intermittent short-circuit to each other.

Other information:

To connect the breakout box / access the control module, see Connecting the breakout box
To access or replace the heated oxygen sensor (HO2S), see Heated oxygen sensor (HO2S), replacing
For information about signals:
- For 6 cylinder engines -2001, see Signal specification
- For 6 cylinder engines 2002-, see Signal specification
- For 6 cylinder engines -2004, see Signal specification
- For 6 cylinder engines 2005-, see Signal specification .
See Contents .

Fig 1: Identifying Front Heated Oxygen Sensor (HO2S) Connector Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Ohmmeter

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying Front Heated Oxygen Sensor (HO2S)

Courtesy of VOLVO CARS OF NORTH AMERICA.

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