Signal Circuit Inspection

Check for Resistance of Harness

1. Ignition "OFF".
2. Connect HO2S connector and PCM connector
3. Measure 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

      
4. Is the resistance within specifications?

   YES

   1. Go to "HEATER CIRCUIT INSPECTION " procedure.

   NO

   1. Check for high resistance of wire in Signal harness. Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.