OBD System Description - A/F Sensor and HO2S Monitor

OBD System Description - A/F Sensor and HO2S Monitor

System Description / Monitoring Procedure

A/F sensor

The following values of A/F sensor are monitored when monitoring conditions are met:

- Maximum and minimum voltage�
- Maximum and minimum current
- Lean-to-rich response rate
- Rich-to-lean response rate

HO2S

HO2S is used for catalyst monitoring and fuel control system (sub feedback). During monitoring, HO2S monitors max. and min. output voltages and compares the voltages with malfunction criteria.

DTC Description / Detecting / Confirmation Procedure

P0131, P0132

Refer to P0131 DTC P0131 / P0132 / P0134 / P2237.

P0133

Refer to P0133 DTC P0133.

P0134

Refer to P0131 DTC P0131 / P0132 / P0134 / P2237.

P0137, P0138

Refer to P0137 DTC P0137 / P0138.

P0139, P013E

Refer to P0139 DTC P0139 / P013E.

P2195, P2196

Refer to P2195 DTC P2195 / P2196.

P2237

Refer to P0131 DTC P0131 / P0132 / P0134 / P2237.

P2A01

Refer to P2A01 DTC P2A01.

A/F Sensor Monitor

Operation