Toyota Tundra. Manual — part 1499



Short between
VC and VTA1
circuits



ECM

P0125

Insufficient Coolant
Temperature for
Closed Loop Fuel
Control



ECT sensor



Cooling system



Thermostat

Comes on

DTC stored

P0128

Coolant Thermostat
(Coolant Temperature
Below Thermostat
Regulating
Temperature)



Thermostat



Cooling system



ECT sensor



ECM

Comes on

DTC stored

P0136

Oxygen Sensor
Circuit Malfunction
(Bank 1 Sensor 2)



Open or short in
HO2 sensor (for
Bank 1) circuit



HO2 sensor (for
Bank 1)



HO2 sensor
heater (for Bank
1)



Air-fuel Ratio
(A/F) sensor
(for Bank 1)



Integration relay



Gas leakage
from exhaust
system

Comes on

DTC stored

P0137

Oxygen Sensor
Circuit Low Voltage
(Bank 1 Sensor 2)



Open in HO2
sensor (for Bank
1) circuit



HO2 sensor (for
Bank 1)



HO2 sensor
heater (for Bank
1)



Integration relay



Gas leakage
from exhaust
system

Comes on

DTC stored

P0138

Oxygen Sensor
Circuit High Voltage
(Bank 1 Sensor 2)



Short in HO2
sensor (for Bank
1) circuit

Comes on

DTC stored

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra



HO2 sensor (for
Bank 1)



ECM internal
circuit
malfunction



Air-Fuel ratio
(A/F) sensor
(for Bank 1)

P0139

Oxygen Sensor
Circuit Slow
Response(Bank 1
Sensor 2)



Short in HO2
sensor (for Bank
1 Sensor 2)
circuit



HO2 sensor (for
Bank 1 Sensor
2)



ECM

Comes on

DTC stored

P0141

Oxygen Sensor
Heater Circuit
Malfunction (Bank 1
Sensor 2)



Open or short in
HO2 sensor
heater circuit



HO2 sensor
heater (for
Sensor 2)



Integration relay



ECM

Comes on

DTC stored

P0156

Oxygen Sensor
Circuit Malfunction
(Bank 2 Sensor 2)



Open or short in
HO2 sensor (for
Bank 2) circuit



HO2 sensor (for
Bank 2)



HO2 sensor
heater (for Bank
2)



Air-fuel Ratio
(A/F) sensor
(for Bank 2)



Integration relay



Gas leakage
from exhaust
system

Comes on

DTC stored

P0157

Oxygen Sensor
Circuit Low Voltage
(Bank 2 Sensor 2)



Open in HO2
sensor (for Bank
2) circuit

Comes on

DTC stored

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra



HO2 sensor (for
Bank 2)



HO2 sensor
heater (for Bank
2)



Integration relay



Gas leakage
from exhaust
system

P0158

Oxygen Sensor
Circuit High Voltage
(Bank 2 Sensor 2)



Short in HO2
sensor (for Bank
2) circuit



HO2 sensor (for
Bank 2)



ECM internal
circuit
malfunction



Air-Fuel ratio
(A/F) sensor
(for Bank 2)

Comes on

DTC stored

P0159

Oxygen Sensor
Circuit Slow
Response (Bank 2
Sensor 2)



Short in HO2
sensor (for Bank
2 Sensor 2)
circuit



HO2 sensor (for
Bank 2 Sensor
2)



ECM

Comes on

DTC stored

P0161

Oxygen Sensor
Heater Circuit
Malfunction (Bank 2
Sensor 2)



Open or short in
HO2 sensor
heater circuit



HO2 sensor
heater (for
Sensor 2)



Integration relay



ECM

Comes on

DTC stored

P0171

System Too Lean
(Bank 1)



Air induction
system



Injector
blockage



Mass Air Flow
(MAF) meter

Comes on

DTC stored

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra



Engine Coolant
Temperature
(ECT) sensor



Fuel pressure



Gas leakage
from exhaust
system



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



PCV valve and
hose



PCV hose
connections



ECM



Fuel pressure
switching valve



Fuel pressure
regulator



Fuel pressure
regulator for
high pressure



Fuel pump



Fuel pump ECU

P0172

System Too Rich
(Bank 1)



Injector leakage
or blockage



MAF meter



ECT sensor



Ignition system



Fuel pressure



Gas leakage
from exhaust

Comes on

DTC stored

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra