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DI-142
DIAGNOSTICS - ENGINE (1GR-FE)
DIDTH-01
DTC P0136 Oxygen Sensor Circuit Malfunction (Bank 1
Sensor 2)
DTC P0137 Oxygen Sensor Circuit Low Voltage (Bank 1
Sensor 2)
DTC P0138 Oxygen Sensor Circuit High Voltage (Bank 1
Sensor 2)
DTC P0156 Oxygen Sensor Circuit Malfunction (Bank 2
Sensor 2)
DTC P0157 Oxygen Sensor Circuit Low Voltage (Bank 2
Sensor 2)
DTC P0158 Oxygen Sensor Circuit High Voltage (Bank 2
Sensor 2)
HINT:
Sensor 2 refers to the sensor mounted behind the Three-Way Catalytic Converter (TWC) and located far
from the engine assembly.
CIRCUIT DESCRIPTION
In order to obtain a high purification rate of the carbon monoxide (CO), hydrocarbon (HC) and nitrogen oxide
(NOx) components in the exhaust gas, a TWC is used. For the most efficient use of the TWC, the air-fuel
ratio must be precisely controlled so that it is always close to the stoichiometric air-fuel level. For the purpose
of helping the ECM to deliver accurate air-fuel ratio control, a Heated Oxygen (HO2) sensor is used.
The HO2 sensor is located behind the TWC, and detects the oxygen concentration in the exhaust gas. Since
the sensor is integrated with the heater that heats the sensing portion, it is possible to detect the oxygen
concentration even when the intake air volume is low (the exhaust gas temperature is low).
When the air-fuel ratio becomes lean, the oxygen concentration in the exhaust gas is rich. The HO2 sensor
informs the ECM that the post-TWC air-fuel ratio is lean (low voltage, i.e. less than 0.45 V).
Conversely, when the air-fuel ratio is richer than the stoichiometric air-fuel level, the oxygen concentration
in the exhaust gas becomes lean. The HO2 sensor informs the ECM that the post-TWC air-fuel ratio is rich
(high voltage, i.e. more than 0.45 V). The HO2 sensor has the property of changing its output voltage drasti-
cally when the air-fuel ratio is close to the stoichiometric level.
The ECM uses the supplementary information from the HO2 sensor to determine whether the air-fuel ratio
after the TWC is rich or lean, and adjusts the fuel injection time accordingly. Thus, if the HO2 sensor is work-
DI-143
DIAGNOSTICS - ENGINE (1GR-FE)
ing improperly due to internal malfunctions, the ECM is unable to compensate for deviations in the primary
air-fuel ratio control.
Atmospheric Air
Ideal Air-Fuel Mixture
Housing
Output Voltage
Solid Electrolyte
(Zirconia Element)
Platinum Electrode
Heater
Coating (Ceramic)
Cover Richer - Air Fuel Ratio - Leaner
Exhaust Gas
B17386
DTC No. DTC Detecting Condition Trouble Area
S Open or short in HO2 sensor (sensor 2) circuit
S HO2 sensor (sensor 2)
The rear heated oxygen sensor voltage during active control is
P0136 S HO2 sensor heater (sensor 2)
0.2 V or less, or 0.6 V or more.
P0156 S Air-Fuel Ratio (A/F) sensor (sensor 1)
(2 trip detection logic)
S EFI relay
S Gas leakage from exhaust system
S Open or short in HO2 sensor (sensor 2) circuit
(a) and (b) is met for more than 30 seconds : S HO2 sensor (sensor 2)
P0136 (a) Estimated rear oxygen sensor temperature is less than S HO2 sensor heater (sensor 2)
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