Checking components 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 the cable for calibration current between engine control module (ECM) terminal #A28 (#A28) and heated oxygen sensor (HO2S) terminal #2.

Check the cable for pump current between heated oxygen sensor (HO2S) terminal #6 and engine control module (ECM) terminal #A24 (#A24). Check for a short-circuit to each other.

Check the cable for an open-circuit.

Check between:
- Heated oxygen sensor (HO2S) terminal #5 and engine control module (ECM) terminal #A42 (#A42)
- Heated oxygen sensor (HO2S) terminal #2 and engine control module (ECM) terminal #A28 (#A28).
Remedy as necessary.

Other information
- See Connecting the breakout box
- For information about signals for 5 cylinder engines: Signal specification
- For information about signals for 6 cylinder engines:
  - 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 Heated oxygen sensor (HO2S), replacing
- See Contents
Fig 1: Identifying Front Heated Oxygen Sensor Connector Terminals
Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying VCT2000 Diagnostic Tool Symbol In VIDA
Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying Rear Heated Oxygen Sensor
Courtesy of VOLVO CARS OF NORTH AMERICA.

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Refer to Verification