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Home >> Kia >> 2021 >> Forte GT, Automatic DCT Trans >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System Diagnosis - 1.6L (6 Of 6) >> DTC P2251-00: O2 Sensor Reference Ground Circuit/Open (Bank 1 Sensor 1) >> Wiring Inspection >> Circuit Inspection
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Circuit Inspection

G13292683Courtesy of KIA MOTORS AMERICA, INC.
Inspection Condition (+) Probe (-) Probe Specification
Connector Terminal Connector Terminal
  1. Disconnect the electrical connector(s) from the concerned component.
  2. Ignition "ON".
HO2S (Bank 1, Sensor 1) connector 2 (nernst voltage) Chassis ground - 0V
HO2S (Bank 1, Sensor 1) connector 1 (virtual ground) Chassis ground - 0V
HO2S (Bank1, Sensor1) connector 3 (pumping current) Chassis ground - 0V
HO2S (Bank1, Sensor1) connector 6 (trim resistor) Chassis ground - 0V
  1. Ignition "OFF".
  2. Disconnect the electrical connector(s) from the concerned component.
HO2S (Bank1, Sensor1) connector 2 (nernst voltage) ECM connector 59 (nernst voltage) Approx. below 1Ω
HO2S (Bank1, Sensor1) connector 1 (virtual ground) ECM connector 80 (virtual ground) Approx. below 1Ω
HO2S (Bank1, Sensor1) connector 3 (pumping current) ECM connector 81 (pumping current) Approx. below 1Ω
HO2S (Bank1, Sensor1) connector 6 (trim resistor) ECM connector 60 (trim resistor) Approx. below 1Ω

Good 

No Good