Toyota Tundra (2015 year). Manual — part 1134
A
OK
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 WATER INLET WITH THERMOSTAT SUB-ASSEMBLY
(a) Remove the water inlet with thermostat sub-assembly
.
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0128; Thermo...
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.
NG
REPLACE WATER INLET WITH THERMOSTAT
SUB-ASSEMBLY
4.
INSPECT ENGINE COOLANT TEMPERATURE SENSOR
(a) Inspect the engine coolant temperature sensor
.
NG
REPLACE ENGINE COOLANT TEMPERATURE
SENSOR
OK
REPLACE ECM
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0128; Thermo...
Last Modified: 9-16-2014
6.6 C
Doc ID: RM000000TEO0FPX
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: 1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0136-P0139,P013A,P013C,P0156-P0159; Oxygen Sensor Circuit (Bank 1
Sensor 2); 2015 MY Tundra [08/2014 - ]
DTC
P0136
Oxygen Sensor Circuit (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 (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
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 ratio, 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
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0136-P0139,...
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.
DTC
NO.
DTC DETECTION CONDITION
TROUBLE AREA
P0136
P0156
Either condition is met:
Abnormal voltage output:
During active air-fuel ratio control, HO2 sensor voltage does not increase
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 leak from exhaust
system
EGR valve assembly
P0137
P0157
Either condition is met:
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 15 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)
Air-Fuel Ratio (A/F)
sensor (for Bank 1, 2)
Integration relay
Gas leak from exhaust
system
EGR valve assembly
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)
ECM
P0139
P0159
Heated oxygen 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)
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0136-P0139,...
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