2074084

Visual Inspection of HO2S

(1)

Visually/physically inspect following items:

Inspect the rear HO2S for Contaminated, deteriorated or aged Rear HO2S.

If contamination is evident on the HO2S, replace contaminated sensor.

(2)

Is the HO2S visually / physically O.K ?

YES

▶ Go to "Check PCM" as below.

▶ Substitute with a known - good HO2S and check for proper operation.

▶ If the problem is corrected, replace HO2S and go to "Verification of Vehicle Repair" procedure.

Check PCM

(1)

Ignition "OFF"

(2)

Connect Scantool and Ignition "ON "

(3)

Select simulation function on scantool.

(4)

Simulate voltage at terminal 1 of HO2 sensor signal connector.

(5)

Does the HO2 sensor signal value changes according to simulation voltage ?

YES

▶ Fault is intermittent caused by poor contact in the sensor’s and/or PCM’s connector. 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.

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

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