Checking Components

Check the exhaust system for air leakage

Check the cable for a short-circuit to supply voltage or ground.

Check between:

• The cable between engine control module (ECM) terminal #A93 (#B33) and heated oxygen sensor (HO2S) terminal #5
• The cable for pump current between engine control module (ECM) terminal #A70 (#B10) and heated oxygen sensor (HO2S) terminal #6
• The cable for calibration current between engine control module (ECM) terminal #B94 (#B34) and heated oxygen sensor (HO2S) terminal #2.

Check the cable between engine control module (ECM) terminal #A69 (#B9) and heated oxygen sensor (HO2S) terminal #1. Check for an open-circuit.

HINT: If the above fault-tracing does not remedy the fault, try replacing the heated oxygen sensors (HO2S), as the diagnostic trouble code (DTC) can also be stored by a defective front/rear heated oxygen sensor (HO2S). 

Remedy as necessary.

Other information 

• see AIR LEAKAGE EXHAUST SYSTEM, CHECK
• see OXYGEN SENSOR (CATALYST MONITOR SENSOR)
• see CHECKING WIRING AND TERMINALS

Fig 1: Identifying VCT2000 Diagnostic Tool Symbol In VIDA

Courtesy of VOLVO CARS CORPORATION

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  Refer to VERIFICATION