Toyota Tundra. Manual — part 1320



Air-fuel Ratio
(A/F) sensor
(for bank 1,2)



Integration relay



Gas leakage
from exhaust
system

P0157

Oxygen Sensor
Circuit Low Voltage
(Bank 2 Sensor 2)



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

Comes on

DTC stored

Applies

P0158

Oxygen Sensor
Circuit High
Voltage (Bank 2
Sensor 2)



Short in HO2
sensor (for bank
1,2) circuit



HO2 sensor (for
bank 1,2)



ECM internal
circuit
malfunction



Air-Fuel ratio
(A/F) sensor
(for bank 1,2)

Comes on

DTC stored

-

P0159

Oxygen Sensor
Circuit Slow
Response (Bank 2
Sensor 2)



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



HO2 sensor (for
Bank 1,2 Sensor
2)

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)

Comes on

DTC stored

Applies

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra



Integration relay
(EFI)



ECM

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 (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

Comes on

DTC stored

Applies

P0172

System Too Rich
(Bank 1)



Injector leakage
or blockage



MAF meter



ECT sensor



Ignition system



Fuel pressure



Gas leakage

Comes on

DTC stored

Applies

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra

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



ECM

P0174

System Too Lean
(Bank 2)



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 (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

Comes on

DTC stored

Applies

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra

hose



PCV hose
connections



ECM

P0175

System Too Rich
(Bank 2)



Injector leakage
or blockage



MAF meter



ECT sensor



Ignition system



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



ECM

Comes on

DTC stored

Applies

P0220

Throttle/Pedal
Position
Sensor/Switch "B"
Circuit



TP sensor (built
into throttle
body)



ECM

Comes on

DTC stored

Applies

P0222

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



TP sensor (built
into throttle
body)



Short in VTA2
circuit



Open in VC
circuit



ECM

Comes on

DTC stored

Applies

P0223

Throttle/Pedal
Position
Sensor/Switch "B"

TP sensor (built into
throttle body)

Comes on

DTC stored

Applies

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra