Toyota Tundra (2015 year). Manual — part 1903
Last Modified: 9-16-2014
6.6 C
Doc ID: RM000000TEO0FOX
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: 3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0136-P0139,P013A,P013C,P0156-P0159; Oxygen Sensor Circuit
Malfunction (Bank 1 Sensor 2); 2015 MY Tundra [08/2014 - ]
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
P0139
Oxygen Sensor Circuit Slow Response (Bank 1 Sensor 2)
DTC
P013A
Oxygen Sensor Slow Response - Rich to Lean Bank 1 Sensor 2
DTC
P013C
Oxygen Sensor Slow Response - Rich to Lean Bank 2 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)
DTC
P0159
Oxygen Sensor Circuit Slow Response (Bank 2 Sensor 2)
DESCRIPTION
HINT:
Sensor 2 refers to the sensor mounted behind the Three-way catalytic converter (TWC) and located far from the engine
assembly.
A three-way catalytic converter (TWC) is used in order to convert the carbon monoxide (CO), hydrocarbon (HC), and nitrogen oxides
becomes 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
lean, and adjusts the fuel injection time accordingly. Thus, if the HO2 sensor is working improperly due to internal malfunctions, the
ECM is unable to compensate for deviations in the primary air-fuel ratio control.
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0136-P0139...
DTC
CODE
DTC DETECTION CONDITION
TROUBLE AREA
P0136
P0156
Abnormal voltage output:
During active air-fuel ratio control, following conditions (a) and (b) met for
than 0.21 V
(b) HO2 sensor voltage does not increase to more than 0.66 V
Low impedance:
Sensor impedance less than 5 Ω for more than 30 seconds when ECM
presumes sensor to be warmed up and operating normally (2 trip
detection logic)
HO2 sensor (for Bank 1,
2) circuit
HO2 sensor (for Bank 1,
2)
Air-fuel Ratio (A/F)
sensor (for Bank 1, 2)
Integration relay
Gas leakage from
exhaust system
P0137
P0157
Low voltage (open):
During active air-fuel ratio control, following conditions (a) and (b) met for
(b) Target air-fuel ratio rich
High impedance:
Sensor impedance 50 kΩ or more for more than 90 seconds when
ECM presumes sensor to be warmed up and operating normally (2
trip detection logic)
HO2 sensor (for Bank 1,
2) circuit
HO2 sensor (for Bank 1,
2)
Integration relay
Gas leakage from
exhaust system
Air fuel ratio sensor
P0138
P0158
Extremely high voltage (short):
HO2 sensor voltage output exceeds 1.2 V for more than 10 seconds
(2 trip detection logic)
HO2 sensor (for Bank 1,
2) circuit
HO2 sensor (for Bank 1,
2)
Air-Fuel ratio (A/F)
sensor (for Bank 1, 2)
ECM
P0139
P0159
The HO2 sensor voltage does not drop below 0.2 V immediately after fuel cut starts
(2 trip detection logic).
HO2 sensor (for Bank 1,
2 Sensor 2) circuit
HO2 sensor (for Bank 1,
2 Sensor 2)
ECM
P013A
P013C
The HO2 sensor voltage does not drop from 0.35 V to 0.2 V immediately after fuel cut
starts (1 trip detection logic).
HO2 sensor (for Bank 1,
2 Sensor 2) circuit
HO2 sensor (for Bank 1,
2 Sensor 2)
ECM
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0136-P0139...
For Mexico Models
DTC
CODE
DTC DETECTION CONDITION
TROUBLE AREA
P0136
P0156
Not applicable
None
P0137
P0157
Low voltage (open):
During active air-fuel ratio control, following conditions (a) and (b) met
(b) Target air-fuel ratio rich
HO2 sensor (bank 1, 2
sensor 2) circuit
HO2 sensor (bank 1, 2
sensor 2)
HO2 sensor heater (bank
1, 2 sensor 2)
Integration relay
Gas leakage from exhaust
system
P0138
P0158
Not applicable
None
P0139
P0159
Not applicable
None
MONITOR DESCRIPTION
Active Air-Fuel Ratio Control
The ECM usually performs air-fuel ratio feedback control so that the Air-Fuel Ratio (A/F) sensor output indicates a near stoichiometric
air-fuel level. This vehicle includes active air-fuel ratio control in addition to regular air-fuel ratio control. The ECM performs active
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 0.66 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 (HO2) Sensor Circuit (DTC P0137 and P0157)
sensor noticeably decreases, the OSC indicates an extraordinarily high value. Even if the ECM attempts to continue regulating the
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0136-P0139...
air-fuel ratio to become rich or lean, the HO2 sensor output does not change.
While performing active air-fuel ratio control, when the target air-fuel ratio is rich and the HO2 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 standard range.
*: The effective resistance in an alternating current electrical circuit.
HINT:
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0136-P0139...
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