Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
Has a problem been found ?
YES
▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure
NO
▶ Go to "Signal Circuit Inspection" procedure.
■ Check short to ground in harness
IG "OFF" and disconnect HO2S(B2/S1) connector.
IG "ON" and ENG "OFF"
Measure voltage between signal terminal of HO2S(B2/S1) harness connector and chassis ground.
Specification :
Approx. 3.5V - when pumping current is ON
Approx. 0.45V - when pumping current is OFF
Is the measured voltage within specification?
YES
▶ Go to "Component Inspection" procedure.
NO
▶ Repair short to ground in harness, and go to "Verification of Vehicle Repair" procedure.
