Toyota Tundra (2015 year). Manual — part 1526
A
OK
This DTC relates to the thermostat.
Read freeze frame data using the Techstream. Freeze frame data records the engine condition when
malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle
was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and
other data from the time the malfunction occurred.
PROCEDURE
1.
CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0128)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
(e) Read DTCs.
Result
RESULT
PROCEED TO
P0128 is output
A
P0128 and other DTCs are output
B
HINT:
If any DTCs other than P0128 are output, troubleshoot those DTCs first.
B
GO TO DTC CHART
2.
CHECK COOLING SYSTEM
(a) Check for defects in the cooling system that might cause the system to be too cold, such as
abnormal radiator fan operation or any modifications.
NG
REPAIR OR REPLACE COOLING SYSTEM
3.
INSPECT THERMOSTAT
(a) Remove the thermostat
.
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0128; Coola...
OK
80 to 84°C (176 to 183°F)
HINT:
In addition to the above check, confirm that the valve is completely closed when the temperature is
below the standard.
(c) Reinstall the thermostat
.
NG
REPLACE THERMOSTAT
4.
INSPECT ENGINE COOLANT TEMPERATURE SENSOR
(a) Inspect the engine coolant temperature sensor
.
NG
REPLACE ENGINE COOLANT TEMPERATURE
SENSOR
OK
REPLACE ECM
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0128; Coola...
Last Modified: 9-16-2014
6.6 C
Doc ID: RM000000TEO0FNX
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: 3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0136-P0139,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
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.
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-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0136-P013...
DTC
CODE
DTC DETECTION CONDITION
TROUBLE AREA
P0136
P0156
Abnormal voltage output:
During active air-fuel ratio control, following conditions (a) and (b) met
less than 0.21 V
(b) HO2 sensor voltage does not increase to more than 0.59 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)
Open or short in HO2
sensor (for Bank 1, 2)
circuit
HO2 sensor (for Bank 1, 2)
HO2 sensor heater (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
(b) Target air-fuel ratio rich
High impedance:
Sensor impedance 15 kΩ or more for more than 90 seconds when
ECM presumes sensor to be warmed up and operating normally (2
trip detection logic)
Open in HO2 sensor (for
Bank 1, 2) circuit
HO2 sensor (for Bank 1, 2)
HO2 sensor heater (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)
Short in 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
HO2 sensor voltage does not drop below 0.2 V immediately after fuel cut
starts (2 trip detection logic)
HO2 sensor voltage does not drop from 0.35 V to 0.2 V immediately
after fuel cut starts (2 trip detection logic)
Short in HO2 sensor (for
Bank 1, 2 Sensor 2) circuit
HO2 sensor (for Bank 1, 2
Sensor 2)
ECM
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
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0136-P013...
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