Toyota Tundra (2015 year). Manual — part 1265
Last Modified: 9-16-2014
6.6 C
Doc ID: RM000000WC40WGX
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: 1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2195-P2198; Oxygen (A/F) Sensor Signal Stuck Lean
(Bank 1 Sensor 1); 2015 MY Tundra [08/2014 - ]
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)
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, and regulates the fuel injection time. If the A/F sensor malfunctions, 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 temperature
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 the narrow type. The heat generated by the heater is conducted to
the solid electrolyte through the alumina, and therefore the sensor activation is accelerated.
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 a current output element, a current is converted into a
voltage inside the ECM. Any measurements taken at the A/F sensor or ECM connectors will show a constant
voltage.
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2195-P2198;...
DTC
NO.
DTC DETECTION CONDITION
TROUBLE AREA
P2195
P2197
Conditions (a) and (b) continue for 5 seconds or more
(2 trip detection logic):
(a) A/F sensor voltage more than 3.8 V
(b) Heated oxygen (HO2) sensor voltage is 0.21 V or higher
Open or short in A/F
sensor (for Sensor 1)
circuit
A/F sensor (for Sensor 1)
A/F sensor heater (for
Sensor 1)
Integration relay
A/F sensor heater and
integration relay circuits
Intake system
Fuel pressure
Fuel injector assembly
EGR valve assembly
ECM
While fuel-cut operation performed (during vehicle deceleration),
A/F sensor current 2.2 mA or more for 3 seconds (2 trip
detection logic)
A/F sensor
EGR valve assembly
ECM
P2196
P2198
Conditions (a) and (b) continue for 5 seconds or more
(2 trip detection logic):
(a) A/F sensor voltage less than 2.8 V
(b) HO2 sensor voltage is below 0.66 V
Open or short in A/F
sensor (for Sensor 1)
circuit
A/F sensor (for Sensor 1)
A/F sensor heater (for
Sensor 1)
Integration relay
A/F sensor heater and
integration relay circuits
Intake system
Fuel pressure
Fuel injector assembly
EGR valve assembly
ECM
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2195-P2198;...
DTC
NO.
DTC DETECTION CONDITION
TROUBLE AREA
While fuel-cut operation performed (during vehicle deceleration),
A/F sensor current less than 0.7 mA for 3 seconds (2 trip
detection logic)
A/F sensor
EGR valve assembly
ECM
HINT:
Sensor voltage detection monitor
Under the air-fuel ratio feedback control, if the A/F sensor output voltage indicates rich or lean for a certain
Example:
If the A/F sensor output voltage is less than 2.8 V (very rich condition) for 5 seconds, despite the rear HO2
sensor output voltage being less than 0.66 V, the ECM stores DTC P2196 or P2198. Alternatively, if the A/F
sensor output voltage is more than 3.8 V (very lean condition) for 5 seconds despite the rear HO2 sensor output
voltage being 0.21 V or more, DTC P2195 or P2197 is stored.
Sensor current detection monitor
A rich air-fuel mixture causes a low A/F sensor current, and a lean air-fuel mixture causes a high A/F sensor
current. Therefore, the sensor output becomes low during acceleration, and it becomes high during deceleration
with the throttle valve fully closed. The ECM monitors the A/F sensor current during fuel-cut and detects any
abnormal current values.
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2195-P2198;...
MONITOR STRATEGY
Related DTCs
P2195: A/F sensor signal stuck lean (Bank 1)
P2196: A/F sensor signal stuck rich (Bank 1)
P2197: A/F sensor signal stuck lean (Bank 2)
P2198: A/F sensor signal stuck rich (Bank 2)
Required Sensors/Components (Main)
A/F sensor
Required Sensors/Components (Related)
HO2 sensor
Once per driving cycle: Sensor current detection monitor
Duration
5 seconds: Sensor voltage detection monitor
3 seconds: Sensor current detection monitor
MIL Operation
2 driving cycles
TYPICAL ENABLING CONDITIONS
All
Monitor runs whenever following
DTCs not present
P0016, P0018 (VVT system - Misalignment)
P0017, P0019 (Exhaust VVT system - Misalignment)
P0031, P0032, P0051, P0052, P101D, P103D (Air fuel ratio sensor
heater)
P006A, P0107, P0108 (Manifold absolute pressure)
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2195-P2198;...
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