Signal Circuit Inspection
- Check Open or Short in signal circuit
- IG KEY "OFF".
- Disconnect HO2S (S1)_UP connector.
- IG KEY "ON" & ENG "OFF"
- Measure the voltage between Virtual Ground terminal "3" of HO2S (S1)_UP harness connector and chassis ground.
Measure the voltage between Nernst Voltage terminal "1" of HO2S (S1)_UPharness connector and chassis ground.
Measure the voltage between Current Pump terminal "1" of HO2S (S1)_UP harness connector and chassis ground.
Measure the voltage between Trim Resistor terminal "4" of HO2S (S1)_UP harness connector and chassis ground.
Specification:
Virtual Ground: Approx 2.5V
Nernst Voltage: Approx 2.9V
Current Pump: Approx 2.8V
Trim Resistor: Approx 2.8V
- Is the measured voltage within specification?
YES
- Go to "COMPONENT INSPECTION " procedure.
NO
- Repair Open or Short circuit and then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.