Toyota Tundra. Manual — part 1146

(bank 1 sensor 1)



Integration relay
(A/F relay)



A/F sensor heater
circuits



PCV valve and
hose



PCV hose
connections



ECM

P0172

System Too Rich
(Bank 1)



Injector leakage
or blockage



MAF meter



ECT sensor



Ignition system



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
(bank 1 sensor 1)



Integration relay
(A/F relay)



A/F sensor heater
circuits



ECM

Comes on

DTC Stored

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

Comes on

DTC Stored

2008 Toyota Tundra

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

exhaust system



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



A/F sensor (bank
2 sensor 1)



A/F sensor heater
(bank 2 sensor 1)



Integration relay
(A/F relay)



A/F sensor heater
circuits



PCV valve and
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(bank
2 sensor 1)
circuit



A/F sensor (bank
2 sensor 1)



A/F sensor heater
(bank 2 sensor 1)



Integration relay
(A/F relay)



A/F sensor heater
circuits



ECM

Comes on

DTC Stored

P0220

Throttle/Pedal Position
Sensor/Switch "B"
Circuit



TP sensor (built
into throttle
body)

Comes on

DTC Stored

2008 Toyota Tundra

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



ECM

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

P0223

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



TP sensor (built
into throttle
body)



Open in VTA2
circuit



Open in E2
circuit



Short between
VC and VTA2
circuits



ECM

Comes on

DTC Stored

P0230

Fuel Pump Primary
Circuit



Open or short in
fuel pump circuit



Fuel pump



Fuel pump ECU



ECM

-

DTC Stored

P0300

Random/Multiple
Cylinder Misfire
Detected



Open or short in
engine wire
harness



Connector
connection



Vacuum hose
connections



Ignition system



Injector



Fuel pressure



Mass Air Flow
(MAF) meter



Engine Coolant
Temperature
(ECT) sensor



Compression

Comes on/Blinks* DTC Stored

2008 Toyota Tundra

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

pressure



Valve clearance



Valve timing



PCV valve and
hose



PCV hose
connections



Air induction
system



ECM

P0301

Cylinder 1 Misfire
Detected



Open or short in
engine wire
harness



Connector
connection



Vacuum hose
connections



Ignition system



Injector



Fuel pressure



Mass Air Flow
(MAF) meter



Engine Coolant
Temperature
(ECT) sensor



Compression
pressure



Valve clearance



Valve timing



PCV valve and
hose



PCV hose
connections



Air induction
system



ECM

Comes on/Blinks* DTC Stored

P0302

Cylinder 2 Misfire
Detected



Open or short in
engine wire
harness



Connector
connection

Comes on/Blinks* DTC Stored

2008 Toyota Tundra

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