Toyota Tundra (2015 year). Manual — part 1527
air-fuel ratio control to detect any deterioration in the Three-Way Catalytic Converter (TWC) and Heated Oxygen (HO2) sensor
malfunctions (refer to the diagram below).
Active air-fuel ratio control is performed for approximately 15 to 20 seconds while driving with a warm engine. During active air-fuel
ratio control, the air-fuel ratio is forcibly regulated to become lean or rich by the ECM. If the ECM detects a malfunction, a DTC is set.
not functioning properly, the voltage output variation is small. For example, when the HO2 sensor voltage does not decrease to less
than 0.21 V and does not increase to more than 0.59 V during active air-fuel ratio control, the ECM determines that the sensor
voltage output is abnormal and sets DTC P0136 or P0156.
Open in Heated Oxygen Sensor Circuit (DTC P0137 or P0157)
heated oxygen sensor output does not change.
While performing active air fuel ratio control, when the target air fuel ratio is rich and the heated oxygen sensor voltage output is
0.21 V or less (lean), the ECM interprets this as an abnormally low sensor output voltage and stores DTC P0137 or P0157.
HINT:
*: The three-way catalytic converter has the capability to store oxygen. The oxygen storage capacity and the emission
.
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0136-P013...
deviates from the standard range.
*: The effective resistance in an alternating current electrical circuit.
HINT:
The ECM continuously monitors the heated oxygen sensor output voltage while the engine is running. DTC P0138 is set if the heated
oxygen sensor voltage output is higher than 1.2 V for 10 seconds or more.
Heated Oxygen Sensor Output Voltage During Fuel Cut (P0139 or P0159)
The sensor output voltage drops to below 0.2 V (extremely lean status) immediately when the vehicle decelerates and fuel cut is
operating. If the voltage does not drop to below 0.2 V when accumulated intake air mass is more than 16.6 g, or voltage does not
drop from 0.35 V to 0.2 V for 1 second or more, the ECM determines that the sensor response has deteriorated, illuminates the MIL
and stores a DTC.
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0136-P013...
MONITOR STRATEGY
Related DTCs
P0136: Heated oxygen sensor (for Bank 1) output voltage (Abnormal voltage output)
P0136: Heated oxygen sensor (for Bank 1) impedance (Low)
P0137: Heated oxygen sensor (for Bank 1) output voltage (Low voltage)
P0137: Heated oxygen sensor (for Bank 1) impedance (High)
P0138: Heated oxygen sensor (for Bank 1) output voltage (Extremely high)
P0139: Heated oxygen sensor output voltage during fuel cut (for Bank 1)
P0156: Heated oxygen sensor (for Bank 2) output voltage (Abnormal voltage output)
P0156: Heated oxygen sensor (for Bank 2) impedance (Low)
P0157: Heated oxygen sensor (for Bank 2) output voltage (Low voltage)
P0157: Heated oxygen sensor (for Bank 2) impedance (High)
P0158: Heated oxygen sensor (for Bank 2) output voltage (Extremely high)
P0159: Heated oxygen sensor output voltage during fuel cut (for Bank 2)
Required Sensors/Components
(Main)
Heated oxygen sensor
Required Sensors/Components
(Related)
Crankshaft position sensor, engine coolant temperature sensor, mass air flow meter and
throttle position sensor
(During fuel cut)
Continuous: Other
Duration
20 seconds: Active air-fuel ratio control detection
90 seconds: Heated oxygen sensor impedance (High)
30 seconds: Heated oxygen sensor impedance (Low)
10 seconds: Output voltage (Stuck high)
7 seconds: Heated oxygen sensor voltage (During fuel cut)
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)
P0037, P0038, P0057, P0058, P102D, P105D (Rear oxygen sensor heater)
P0102, P0103 (Mass air flow meter)
P0112, P0113 (Intake air temperature sensor)
P0115, P0117, P0118 (Engine coolant temperature sensor)
P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2135 (Throttle position sensor)
P0125 (Insufficient coolant temperature for closed loop fuel control)
P0128 (Thermostat)
P0171, P0172, P0174, P0175 (Fuel system)
P0301 - P0308 (Misfire)
P0335 (Crankshaft position sensor)
P1340 (Camshaft position sensor)
P0451, P0452, P0453 (EVAP system)
P0412, P0415, P0418, P0419, P1613, P1614 (Secondary air injection system control)
P2440 - P2447 (Secondary air injection system)
P0500, P0722 (Vehicle Speed Sensor)
P014C, P014D, P014E, P014F, P015A, P015B, P015C, P015D, P2195, P2196, P2197, P2198, P2237,
P2238, P2239, P2240, P2241, P2242, P2252, P2253, P2255, P2256 (Air fuel ratio sensor)
Heated Oxygen Sensor Output Voltage (Abnormal Voltage Output and Low Voltage):
Active air-fuel ratio control
Executing
Battery voltage
11 V or more
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0136-P013...
Atmospheric pressure
76 kPa (570 mmHg) or higher
Engine coolant temperature
75°C (167°F) or more
Idling
OFF
Engine speed
Less than 3200 rpm
A/F sensor status
Activated
Fuel system status
Closed loop
Fuel cut
OFF
Engine load
10 to 75%
Shift position
4th or higher
Heated Oxygen Sensor Impedance (Low):
Battery voltage
11 V or more
Estimated rear HO2 sensor temperature
Less than 700°C (1292°F)
ECM monitor
Completed
DTC P0607
Not set
Heated Oxygen Sensor Impedance (High):
Battery voltage
11 V or more
Estimated rear HO2 sensor temperature
450 to 750°C (842 to 1382°F)
DTC P0607
Not set
Heated Oxygen Sensor Output Voltage (Extremely High):
Battery voltage
11 V or more
Time after engine start
2 seconds or more
Heated Oxygen Sensor Output Voltage during fuel cut:
Engine coolant temperature
75°C (167°F) or higher
Estimated catalyst temperature
400°C (752°F) or higher
Fuel cut
ON
TYPICAL MALFUNCTION THRESHOLDS
Heated Oxygen Sensor Output Voltage (Abnormal Voltage Output):
(a) Commanded air-fuel ratio
14.3 or less
(b) Rear HO2 sensor voltage
0.21 to 0.59 V
Heated Oxygen Sensor Output Voltage (Low):
(a) Commanded air-fuel ratio
14.3 or less
(b) Rear HO2 sensor voltage
Less than 0.21 V
(c) OSC
2.5 g or more
Heated Oxygen Sensor Impedance (Low):
Heated oxygen sensor impedance
Less than 5 Ω
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0136-P013...
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