Component Inspection
■ Visual Check(HO2S(S1))
1.

Inspect the front HO2S for any silicon contamination. This contamination will be indicated by a white powdery coating and this will result in a bad false voltage signal.

2.

Is sensor contaminated?

▶ Go to next step as below.

▶ Replace HO2S(S1) and then go to "Verification of Vehicle Repair" procedure.

■ Check HO2S(S1) performance

EURO4 - HO2S [Bank 1/Sensor1] (Binary type)

3.

Warm up the engine to normal operating temperature.

4.

Connect VMI to GDS and select "Oscilloscope".

5.

Connect Channel A positive probe to Pin No.1 (Signal) and Channel A negative probe to Pin No.2 (Gorund).

Specification : Signal is switching from rich(above 0.45V) to lean(below 0.45V) a minimum of 3 times in 10 seconds

Fig.1) Engine Idle - Signal waveforms of front HO2S(the upper) and rear HO2S(the lower)

Fig.2) Approx. 2000rpm(Warm Up) - Signal waveforms of front HO2S(the upper) and rear HO2S(the lower)

■ Confirm Part Inspection
6.

Does the HO2S(S1) operate properly? (Check variation)

▶ Go to "Verification of Vehicle Repair" procedure.

▶ If no problems were found with the circuits or connectors, Replace the HO2S(S1).

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