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Power Circuit Inspection

Ignition "OFF" disconnect HO2S (S1) connector.
Ignition "ON".
Measure voltage between Pin No. 4 (power) terminal of HO2S (S1) harness connector and chassis ground.
Specification: Approx 12V
Is the measured voltage within specification?
YES
- Go to "Control Circuit Inspection " procedure
NO
- Repair or replace as necessary and then, go to "Verification of Vehicle Repair " procedure.