Ground Circuit Inspection

■ Check resistance 

1. IG "OFF". Disconnect HO2S connector.
2. Measure resistance between ground terminal of HO2S (B1/S1) harness connector and chassis ground.

   Specification:  Approx. 0Ω

3. Is resistance within the specification?

   YES 

   • Go to "Signal circuit inspection " procedure.

   NO 

   • Repair or replace as necessary and go to "Verification of Vehicle Repair " procedure.
   NOTE: HO2S must have a clean air reference to function properly. The air is obtained by way of the sensor wire (s). Do not attempt to repair the wire (s), connector, or the terminals.