Es

A115539E03

DTC No.

DTC Detection Conditions

Trouble Areas

P0136 P0156

• Abnormal voltage output:

During active air-fuel ratio control, following conditions (a) and (b) met for certain period of time (2 trip detection logic)

(a) Heated Oxygen (HO2) sensor voltage does not decrease to less than 0.21 V

(b) HO2 sensor voltage does not increase to more than 0.59 V

Sensor impedance less than 5 Q for more than 30 seconds when ECM presumes sensor to being warmed up and operating normally (2 trip detection logic)

• Open or short in HO2 sensor (bank 1, 2 sensor 2) circuit

• Air-Fuel Ratio (A/F) sensor (bank 1, 2 sensor 1)

• Gas leakage from exhaust system

P0137 P0157

During active air-fuel ratio control, following conditions (a) and (b) met for certain period of time (2 trip detection logic)

(a) HO2 sensor voltage output less than 0.21 V

(b) Target air-fuel ratio rich

Sensor impedance 15 kQ or more for more than 90 seconds when ECM presumes sensor to being warmed up and operating normally (2 trip detection logic)

• Open in HO2 sensor (bank 1, 2 sensor 2) circuit

• Gas leakage from exhaust system

P0138 P0158

During active air-fuel ratio control, following conditions (a) and (b) met for certain period of time (2 trip detection logic)

(a) HO2 sensor voltage output 0.59 V or more

(b) Target air-fuel ratio lean

• Extremely high voltage (short):

HO2 sensor voltage output exceeds 1.2 V for more than 10 seconds (2 trip detection logic)

• Short in HO2 sensor (bank 1, 2 sensor 2) circuit

• ECM internal circuit malfunction

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