Component Inspection
1.

Visual Inspection

(1)

IG "OFF"

(2)

Disconnect HO2S(B1/S1) connector.

(3)

Check that HO2S(B1S1) is contaminated or damaged by foreign materials.

(4)

Has a problem been found ?

YES

a.

Go to "Check HO2S(B1/S1) performance" as follows.

NO

a.

Substitute with a known - good HO2S(B1/S1) and check for proper operation.

If the problem is corrected, replace HO2S(B1/S1) and go to "Verification of Vehicle Repair" procedure.

2.

Check HO2S(B1/S1) performance

(1)

IG "OFF".

(2)

Connect probe to terminal 2 of HO2S(B1/S1) connector and select oscilloscope function with scantool.

(3)

Warm up the engine to normal operating temperature.

(4)

Measure signal waveform of HO2S(B1/S1) with scantool

(5)

Is the measured signal waveform within specification ?

YES

a.

Go to "Check ECM" as follows.

NO

a.

Substitute with a known - good HO2S(B1/S1) and check for proper operation.

If the problem is corrected, replace HO2S(B1/S1) and go to "Verification of Vehicle Repair" procedure.

3.

Check ECM

(1)

IG "OFF" and disconnect B1S1 connector.

(2)

Connect scantool and Key "ON".

(3)

Select simulation function on scantool.

(4)

Simulate voltage at terminal 2 of HO2S(B1/S1) signal connector.

(5)

Does the signal value of HO2S(B1/S1) change according to simulation voltage ?

YES

a.

Thoroughly check connectors for looseness, poor connection, bending, corrosion,contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.

NO

a.

Substitute with a known - good ECM and check for proper operation.

If the problem is corrected, replace ECM and go to "Verification of Vehicle Repair" procedure.

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