Checking wiring and components: Notes

Check heated oxygen sensor (HO2S) resistance between #1 and #2.

Check signal cable between heated oxygen sensor (HO2S) #2 and control module #A35 (#A35) 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) for 5 cylinder engines, see Replacing lambda probes .
To access/replace the heated oxygen sensor (HO2S) for 6 cylinder engines, see Heated oxygen sensors (HO2S), replacing .
For resistance values, see Component specifications .
For information about signals on 5-cylinder engines, see Signal specification .
For information about signals on 6-cylinder engines, see Signal specification .

Fig 1: Identifying Rear Heated Oxygen Sensor Connector

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Voltmeter

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying Rear Heated Oxygen Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.