Signal Circuit Inspection

Ignition "OFF".
Disconnect the HO2S connector and PCM connector.
Measure the resistance between terminal "1" of the HO2S harness connector and "C4" of the PCM harness connector.
1. Specification: Approx. 0Ω
  
  Fig 1: Measuring Resistance Between Terminal 1 Of HO2S And C4 Of PCM Harness Connector
Is the resistance within specifications?
YES
1. Go to "GROUND CIRCUIT INSPECTION " procedure.
NO
1. Check for open in Signal harness. Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.