Toyota Tundra. Manual — part 1145

Temperature Circuit
Range/Performance
Problem



Thermostat



ECT sensor

P0117

Engine Coolant
Temperature Circuit
Low Input



Short in ECT
sensor



ECT sensor



ECM

Comes on

DTC Stored

P0118

Engine Coolant
Temperature Circuit
High Input



Open in ECT
sensor circuit



ECT sensor



ECM

Comes on

DTC Stored

P011B

Engine Coolant
Temperature/Intake
Air Temperature
Correlation



IAT sensor



ECT sensor



ECM

Comes on

DTC Stored

P0120

Throttle/Pedal Position
Sensor/Switch "A"
Circuit Malfunction



Throttle Position
(TP) sensor (built
into throttle
body)



ECM

Comes on

DTC Stored

P0121

Throttle/Pedal Position
Sensor/Switch "A"
Circuit
Range/Performance
Problem

TP sensor (built into
throttle body)

Comes on

DTC Stored

P0122

Throttle/Pedal Position
Sensor/Switch "A"
Circuit Low Input



TP sensor (built
into throttle
body)



Short in VTA1
circuit



Open in VC
circuit



ECM

Comes on

DTC Stored

P0123

Throttle/Pedal Position
Sensor/Switch "A"
Circuit High Input



TP sensor (built
into throttle
body)



Open in VTA1
circuit



Open in E2
circuit



Short between
VC and VTA1

Comes on

DTC Stored

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

circuits



ECM

P0125

Insufficient Coolant
Temperature for
Closed Loop Fuel
Control



Cooling system



Engine coolant
temperature
sensor



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
(bank 1 sensor 2)
circuit



HO2 sensor
(bank 1 sensor 2)



HO2 sensor
heater (bank 1
sensor 2)



Air-Fuel Ratio
(A/F) sensor
(bank 1 sensor 1)



Gas leakage from
exhaust system

Comes on

DTC Stored

P0137

Oxygen Sensor Circuit
Low Voltage (Bank 1
Sensor 2)



Open in HO2
sensor (bank 1
sensor 2) circuit



HO2 sensor
(bank 1 sensor 2)



HO2 sensor
heater (bank 1
sensor 2)



Gas leakage from
exhaust system

Comes on

DTC Stored

P0138

Oxygen Sensor Circuit
High Voltage (Bank 1
Sensor 2)



Short in HO2
sensor (bank 1
sensor 2) circuit



HO2 sensor
(bank 1 sensor 2)



ECM internal

Comes on

DTC Stored

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

circuit
malfunction



A/F sensor (bank
1 sensor 1)

P0139

Oxygen Sensor Circuit
Slow Response (Bank
1 Sensor 2)



Short in HO2
sensor (bank 1
sensor 2) circuit



HO2 sensor
(bank 1 sensor 2)

Comes on

DTC Stored

P0141

Oxygen Sensor Heater
Circuit Malfunction
(Bank 1 Sensor 2)



Open or short in
HO2 sensor
(bank 1 sensor 2)
heater circuit



HO2 sensor
(bank 1 sensor 2)
heater



EFI NO. 2 fuse



ECM

Comes on

DTC Stored

P0156

Oxygen Sensor Circuit
Malfunction (Bank 2
Sensor 2)



Open or short in
HO2 sensor
(bank 2 sensor 2)
circuit



HO2 sensor
(bank 2 sensor 2)



HO2 sensor
heater (bank 2
sensor 2)



Air-Fuel Ratio
(A/F) sensor
(bank 2 sensor 1)



Gas leakage from
exhaust system

Comes on

DTC Stored

P0157

Oxygen Sensor Circuit
Low Voltage (Bank 2
Sensor 2)



Open in HO2
sensor (bank 2
sensor 2) circuit



HO2 sensor
(bank 2 sensor 2)



HO2 sensor
heater (bank 2
sensor 2)



Gas leakage from
exhaust system

Comes on

DTC Stored

P0158

Oxygen Sensor Circuit

Comes on

DTC Stored

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

High Voltage (Bank 2
Sensor 2)



Short in HO2
sensor (bank 2
sensor 2) circuit



HO2 sensor
(bank 2 sensor 2)



ECM internal
circuit
malfunction



A/F sensor (bank
2 sensor 1)

P0159

Oxygen Sensor Circuit
Slow Response(Bank 2
Sensor 2)



Short in HO2
sensor (bank 2
sensor 2) circuit



HO2 sensor
(bank 2 sensor 2)

Comes on

DTC Stored

P0161

Oxygen Sensor Heater
Circuit Malfunction
(Bank 2 Sensor 2)



Open or short in
HO2 sensor
(bank 2 sensor 2)
heater circuit



HO2 sensor
(bank 2 sensor 2)
heater



EFI NO. 2 fuse



ECM

Comes on

DTC Stored

P0171

System Too Lean
(Bank 1)



Air induction
system



Injector blockage



Mass Air Flow
(MAF) meter



Engine Coolant
Temperature
(ECT) sensor



Fuel pressure



Gas leakage from
exhaust system



Open or short in
A/F sensor(bank
1 sensor 1)
circuit



A/F sensor (bank
1 sensor 1)



A/F sensor heater

Comes on

DTC Stored

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra