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DI-312
DIAGNOSTICS - ENGINE (1GR-FE)
DIDU5-01
DTC P2195 Oxygen (A/F) Sensor Signal Stuck Lean
(Bank 1 Sensor 1)
DTC P2196 Oxygen (A/F) Sensor Signal Stuck Rich
(Bank 1 Sensor 1)
DTC P2197 Oxygen (A/F) Sensor Signal Stuck Lean
(Bank 2 Sensor 1)
DTC P2198 Oxygen (A/F) Sensor Signal Stuck Rich
(Bank 2 Sensor 1)
HINT:
S Although the DTC titles say oxygen sensor, these DTCs relate to the Air-Fuel Ratio (A/F) sensor.
S Sensor 1 refers to the sensor mounted in front of the Three-Way Catalytic Converter (TWC) and lo-
cated near the engine assembly.
DI-313
DIAGNOSTICS - ENGINE (1GR-FE)
CIRCUIT DESCRIPTION
The A/F sensor generates a voltage* that corresponds to the actual air-fuel ratio. This sensor voltage is used
to provide the ECM with feedback so that it can control the air-fuel ratio. The ECM determines the deviation
from the stoichiometric air-fuel ratio level, and regulates the fuel injection time. If the A/F sensor malfunc-
tions, the ECM is unable to control the air-fuel ratio accurately.
The A/F sensor is the planar type and is integrated with the heater, which heats the solid electrolyte (zirconia
element). This heater is controlled by the ECM. When the intake air volume is low (the exhaust gas tempera-
ture is low), a current flows into the heater to heat the sensor, in order to facilitate accurate air-fuel ratio
detection. In addition, the sensor and heater portions are narrower than the conventional type. The heat
generated by the heater is conducted to the solid electrolyte though the alumina, therefore the sensor activa-
tion is accelerated.
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 level.
*: Value changes inside the ECM. Since the A/F sensor is the current output element, a current is converted
to a voltage inside the ECM. Any measurements taken at the A/F sensor or ECM connectors will show a
constant voltage.
Solid Electrolyte
(Zirconia Element)
A/F Sensor Voltage
4.0
Alumina
ECM Monitored
Heater
3.0
Platinum
Electrode
Element 2.0
Cover
12 13 14 15 16 17
Exhaust Gas Atmospheric Air
A A Air-Fuel Ratio
A-A Cross Section A23473
DTC No. DTC Detection Conditions Trouble Areas
While fuel-cut operation performing (during vehicle decelera-
P2195 S A/F sensor (sensor 1)
tion), air-fuel ratio sensor current is 3.6 mA or more for 3 se-
P2197 S ECM
conds.
While fuel-cut operation performing (during vehicle decelera-
P2196 S A/F sensor (sensor 1)
tion), air-fuel ratio sensor current is less than 1.4 mA for 3
P2198 S ECM
seconds.
DI-314
DIAGNOSTICS - ENGINE (1GR-FE)
HINT:
S When any of these DTCs are set, check the A/F sensor voltage output by selecting the following menu
items on a hand-held tester: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / AFS B1S1.
S Short-term fuel trim values can also be read using a hand-held tester.
MONITOR DESCRIPTION
A rich air-fuel mixture causes a low air-fuel ratio sensor current, and a lean air fuel mixture causes a high
air fuel ratio sensor current. Therefore, the sensor output becomes high during acceleration, and the sensor
becomes low during deceleration.
The ECM monitors the air-fuel ratio sensor current during fuel-cut and detects an unusual current value.
If the cumulative time the sensor output is out of range exceeds more than 3 seconds, the ECM interprets
a malfunction in the air-fuel ratio sensor and sets a DTC.
Air-fuel Ratio Sensor Current Monitor:
ON
Fuel-cut
OFF
Sensor Current 3 sec. 3 sec. 3 sec.
Delay Delay Malfunction Delay
(mA)
A/F Sensor
Current
High Side Thresh
Normal
Low Side Thresh
3 sec. or more t1 t2
Time
t1 + t2 = 3 sec. or more
A23456
MONITOR STRATEGY
A/F sensor (Bank 1) signal stuck lean
P2195
A/F sensor (Bank 1) current (high side)
A/F sensor (Bank 1) signal stuck rich
P2196
A/F sensor (Bank 1) current (low side)
Related DTC
R l t d DTCs
A/F sensor (Bank 2) signal stuck lean
P2197
A/F sensor (Bank 2) current (high side)
A/F sensor (Bank 2) signal stuck rich
P2198
A/F sensor (Bank 2) current (low side)
Required sensors/components A/F sensor
Frequency of operation Continuous
10 sec.: A/F sensor signal stuck lean/rich
Duration
3 sec.: A/F sensor current (high/low side)
MIL operation 2 driving cycles
Sequence of operation None
DI-315
DIAGNOSTICS - ENGINE (1GR-FE)
TYPICAL ENABLING CONDITIONS
Specification
Item
It
Minimum Maximum
The monitor will run whenever these
See page DI-18
DTCs are not present
P2195, P2197 (A/F sensor signal stuck lean):
Duration while all of following conditions
2 sec. -
met
Rear HO2S voltage 0.15 V -
Time after engine start 30 sec. -
A/F sensor status Activated
Fuel system status Closed-loop
Engine Running
P2196, P2198 (A/F sensor signal stuck rich):
Duration while all of following conditions
2 sec. -
met
Rear HO2S voltage - 0.6 V
Time after engine start 30 sec. -
A/F sensor status Activated
Fuel system status Closed-loop
Engine Running
P2195, P2197 (A/F sensor current (High side)):
Battery voltage 11 V -
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