Toyota Tundra. Manual — part 1139

Motor

Min.: 0 A, Max.:
80 A

Throttle
Motor Current

Whether or not
throttle actuator
control permitted:
ON or OFF

ON: Idling

Read value with ignition switch ON (do
not start engine)

Throttle
Motor DUTY

Throttle actuator
duty:
Min.: 0%, Max.:
100%

0.5 to 40%: Idling

-

Throttle
Motor Current

Throttle actuator
current:
Min.: 0 A, Max.:
19.92 A

0 to 3.0 A: Idling

-

Throttle
Motor Open
Duty

Throttle actuator
opening duty
ratio:
Min.: 0%, Max.:
100%

0 to 40%: Idling

When accelerator pedal depressed, duty
ratio increased

Throttle
Motor Close
Duty

Throttle actuator
closed duty ratio:
Min.: 0%, Max.:
100%

0 to 40%: Idling

When accelerator pedal released
quickly, duty ratio increased

Throttle
Motor Duty
(Open)

Throttle actuator
duty ratio (open):
Min.: 0%, Max.:
100%

-

-

Throttle
Motor Duty
(Close)

Throttle actuator
duty ratio (close):
Min.: 0%, Max.:
100%

-

-

O2S B1 S2

Heated oxygen
sensor output
voltage bank 1
sensor 2:
Min.: 0 V, Max.:
1.275 V

0.1 to 0.9 V:
Driving at 44 mph (70
km/h)

Performing Control the Injection
Volume or Control the Injection
Volume for A/F sensor function of
Active Test enables technician to check
output voltage of sensor

O2S B2 S2

Heated oxygen
sensor output
voltage bank 2
sensor 2:
Min.: 0 V, Max.:
1.275 V

0.1 to 0.9 V:
Driving at 44 mph (70
km/h)

Performing Control the Injection
Volume or Control the Injection
Volume for A/F sensor function of
Active Test enables technician to check
output voltage of sensor

AFS B1 S1

A/F sensor output
voltage bank 1
sensor 1:

2.8 to 3.8 V: Idling

Performing Control the Injection
Volume or Control the Injection
Volume for A/F sensor function of

2008 Toyota Tundra

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

Min.: 0 V, Max.:
7.999 V

Active Test enables technician to check
output voltage of sensor

AFS B2 S1

A/F sensor output
voltage bank 2
sensor 1:
Min.: 0 V, Max.:
7.999 V

2.8 to 3.8 V: Idling

Performing Control the Injection
Volume or Control the Injection
Volume for A/F sensor function of
Active Test enables technician to check
output voltage of sensor

AFS B2 S1

A/F sensor output
current bank 2
sensor 1:
Min.: -128 mA,
Max.: 127.99 mA

-0.5 to 0.5 mA: Idling

Performing Control the Injection
Volume or Control the Injection
Volume for A/F sensor function of
Active Test enables technician to check
output voltage of sensor

Total FT #1

Total fuel trim of
bank 1 Average
value for fuel trim
system of bank 1:
Min.: -0.5, Max.:
0.496

-0.28 to 0.2: Idling

-

Total FT #2

Total fuel trim of
bank 1 Average
value for fuel trim
system of bank 2:
Min.: -0.5, Max.:
0.496

-0.28 to 0.2: Idling

-

Short FT #1

Short-term fuel
trim of bank 1:
Min.: -100%,
Max.: 99.2%

-20 to 20%

Short-term fuel compensation used to
maintain air-fuel ratio at stoichiometric
air-fuel ratio

Long FT #1

Long-term fuel
trim of bank 1:
Min.: -100%,
Max.: 99.2%

-30 to 30%

Overall fuel compensation carried out in
long-term to compensate continual
deviation of short-term fuel trim from
central value

Short FT #2

Short-term fuel
trim of bank 2:
Min.:-100%,
Max.: 99.2%

-20 to 20%

Short-term fuel compensation used to
maintain air-fuel ratio at stoichiometric
air-fuel ratio

Long FT #2

Long-term fuel
trim of bank 2:
Min.: -100%,
Max.: 99.2%

-30 to 30%

Overall fuel compensation carried out in
long-term to compensate continual
deviation of short-term fuel trim from
central value

Fuel system status
(bank 1):



OL (Open Loop): Has not yet
satisfied conditions to go closed
loop



CL (Closed Loop): Using heated
oxygen sensor as feedback for
fuel control

2008 Toyota Tundra

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

Fuel System
Status (Bank
1)

OL or CL or
OLDrive or
OLFault or
CLFault

CL: Idling after
warming up



OLDrive: Open loop due to
driving conditions (fuel
enrichment)



OLFault: Open loop due to
detected system fault



CLFault: Closed loop but heated
oxygen sensor, which used for
fuel control malfunctioning

Fuel System
Status (Bank
2)

Fuel system status
(bank 2):
OL or CL or
OLDrive or
OLFault or
CLFault

CL: Idling after
warming up



OL (Open Loop): Has not yet
satisfied conditions to go closed
loop



CL (Closed Loop): Using heated
oxygen sensor as feedback for
fuel control



OLDrive: Open loop due to
driving conditions (fuel
enrichment)



OLFault: Open loop due to
detected system fault



CLFault: Closed loop but heated
oxygen sensor, which used for
fuel control malfunctioning

O2FT B1 S2

Short-term fuel
trim associated
with bank 1 sensor
2:
Min.: -100%,
Max.: 99.2%

-20 to 20%

-

O2FT B2 S2

Short-term fuel
trim associated
with bank 2 sensor
2:
Min.:-100%,
Max.: 99.2%

-20 to 20%

-

AF FT B1 S1

Short-term fuel
trim associated
with bank 1 sensor
1:
Min.: 0, Max.:
1.999



Value less than 1
(0.000 to 0.999)
= Rich



Stoichiometric
air-fuel ratio = 1



Value greater
than 1 (1.001 to
1.999) = Lean

-

A/F sensor output
current bank 1

Performing Control the Injection
Volume or Control the Injection

2008 Toyota Tundra

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

AFS B1 S1

sensor 1:
Min.: -128 mA,
Max.: 127.99 mA

-0.5 to 0.5 mA: Idling

Volume for A/F sensor function of
Active Test enables technician to check
output voltage of sensor

AF FT B2 S1

Short-term fuel
trim associated
with bank 2 sensor
1:
Min.: 0, Max.:
1.999



Value less than 1
(0.000 to 0.999)
= Rich



Stoichiometric
air-fuel ratio = 1



Value greater
than 1 (1.001 to
1.999) = Lean

-

Catalyst
Temp (B1 S1)

Catalyst
temperature (bank
1 sensor 1):
Min.: -40°C,
Max.: 6513.5°C

-

-

Catalyst
Temp (B2 S1)

Catalyst
temperature (bank
2 sensor 1):
Min.: -40°C,
Max.: 6513.5°C

-

-

Catalyst
Temp (B1 S2)

Catalyst
temperature (bank
1 sensor 2):
Min.: -40°C,
Max.: 6513.5°C

-

-

Catalyst
Temp (B2 S2)

Catalyst
temperature (bank
2 sensor 2):
Min.: -40°C,
Max.: 6513.5°C

-

-

Sub O2S
Impedance
B1S2

Sub heated
oxygen sensor
impedance (bank
1 sensor 2):
Min.: On, Max.:
21247.68 ohms

5 to 15000: After
driving approx. 10
min. in urban area

-

Sub O2S
Impedance
B2S2

Sub heated
oxygen sensor
impedance (bank
2 sensor 2):
Min.: On, Max.:
21247.68 ohms

5 to 15000: After
driving approx. 10
min. in urban area

-

Initial Engine

Initial engine
coolant
temperature:

Coolant temperature

Service data

2008 Toyota Tundra

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