P2243

DTC P2243 Linear HO2S Reference Voltage Circuit/Open (Bank1, Sensor1)

Component Location:

DESCRIPTION

The linear oxygen sensor is mounted on the front side of the Catalytic Converter (warm-up catalytic converter) or in the front exhaust pipe, which detects a wide range of air/fuel ratio in the exhaust gas from rich to lean regions. This linear oxygen sensor produces a current that corresponds to a specific air/fuel ratio. The ECM monitors this signal and determines whether the air/fuel mixture is rich or lean. The ECM constantly monitors the HO2S and increases or decreases the fuel injection duration by using the HO2S signal, which is called closed-loop fuel control operation.

Detecting Condition & Limp Home:

DTC DETECTING CONDITION

1. DTC Description
The ECM monitors front O2 sensor tip temperature and signal at the same time to check open circuit of Reference Voltage Circuit ( ECM PIN No. 40). The ECM sets DTC P2243 if front O2 tip temperature is normal during predetermined time and front O2 sensor signal stuck is detected. If the same error code is set in the next driving cycle, the ECM illuminates the MIL.

2. Conditions for Setting the DTC

Schematic Diagram:

Step 1 - 2:

Inspection Procedure