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DI-806
DIAGNOSTICS - ENGINE (2UZ-FE)
DIDS4-01
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-807
DIAGNOSTICS - ENGINE (2UZ-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
DI-808
DIAGNOSTICS - ENGINE (2UZ-FE)
DTC No. DTC Detection Conditions Trouble Areas
P2195 While fuel-cut operation (during vehicle deceleration), air-fuel S A/F sensor (sensor 1)
P2197 ratio sensor current is 3.6 mA or more for 3 seconds. S ECM
S Open or short in A/F sensor (sensor 1) circuit
S A/F sensor (sensor 1)
S A/F sensor (sensor 1) heater
Conditions (a) and (b) continue for 2 seconds or more
S EFI relay
(2 trip detection logic):
P2195 S A/F sensor heater and relay circuits
(a) Air-Fuel Ratio (A/F) sensor voltage more than 3.8 V
S Air induction system
(b) Heated Oxygen (HO2) sensor voltage 0.15 V or more
S Fuel pressure
S Injector
S ECM
P2196 While fuel-cut operation (during vehicle deceleration), air-fuel S A/F sensor (sensor 1)
P2198 ratio sensor current is less than 1.4 mA for 3 seconds. S ECM
S Open or short in A/F sensor (sensor 1) circuit
S A/F sensor (sensor 1)
S A/F sensor (sensor 1) heater
Conditions (a) and (b) continue for 2 seconds or more
S EFI relay
(2 trip detection logic):
P2196 S A/F sensor heater and relay circuits
(a) A/F sensor voltage less than 2.8 V
S Air induction system
(b) HO2 sensor voltage less than 0.85 V
S Fuel pressure
S Injector
S ECM
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.
S The ECM regulates the voltage at the A1A+ and A1A- terminals of the ECM at a constant level. There-
fore, the A/F sensor voltage output cannot be confirmed without using a hand-held tester.
S If the A/F sensor functional malfunction is detected, the ECM sets this DTC.
MONITOR DESCRIPTION
S Sensor voltage detection monitor:
Under the air-fuel ratio feedback control, if the A/F sensor voltage output indicates rich or lean for a
certain period of time, the ECM determines that there is a malfunction in the A/F sensor. The ECM illu-
minates the MIL and sets a DTC.
Example:
If the A/F sensor voltage output is less than 2.8 V (very rich condition) for 10 seconds, despite the HO2
sensor voltage output being less than 0.85 V, the ECM sets DTC P2196. Alternatively, if the A/F sensor
voltage output is more than 3.8 V (very lean condition) for 10 seconds, despite the HO2 sensor voltage
output being 0.15 V or more, DTC P2195 or P2197 is set.
DI-809
DIAGNOSTICS - ENGINE (2UZ-FE)
S Sensor current detection monitor:
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 unusual current value.
If the cumulative time the sensor output is out of range exceeds 3 seconds, the ECM interprets a mal-
function 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 Threshold
Normal
Low Side Threshold
3 sec. or more t1 t2
Time
Cumulative 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 Once per driving cycle
15 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-810
DIAGNOSTICS - ENGINE (2UZ-FE)
TYPICAL ENABLING CONDITIONS
Specification
Item
It
Minimum Maximum
The monitor will run whenever these
See page DI-437
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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