Checking wiring and components: Notes

Check the heated oxygen sensor (HO2S) resistance between #3 and #4.

Check signal cable between heated oxygen sensor (HO2S) #4 and control module #A17 (#A17) for a short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults

HINT: Use a test lamp with at least a 3 W bulb to determine whether the cable is short-circuited to supply voltage.

Remedy as necessary.

Other information

Connecting the breakout box/accessing the control module, see Connecting the breakout box .
To access/replace the heated oxygen sensor (HO2S), see Heated oxygen sensors (HO2S), replacing .
For resistance values, see Component specifications .
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 .

Fig 1: Identifying Front Heated Oxygen Sensor Connector Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Voltage Display

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying Front Heated Oxygen Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.