Toyota Tundra. Manual — part 1314

Total FT #1

for fuel trim
system of bank
1/
Min.: -0.5 V,
Max.: 0.496 V

-0.2 to 0.2: Idling

-

Total FT #2

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

-0.2 to 0.2: Idling

-

Short FT #1

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

-20 to +20%

This item refers to the short-term fuel
compensation used to maintain the air fuel
ratio at stoichiometric air-fuel ratio

Long FT #1

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

-20 to +20%

This item refers to the overall fuel
compensation carried out in long-term to
compensate a continual deviation of the
short-term fuel trim from the central value

Short FT #2

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

-20 to +20%

This item refers to the short-term fuel
compensation used to maintain the air fuel
ratio at stoichiometric air-fuel ratio

Long FT #2

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

-20 to +20%

This item refers to the overall fuel
compensation carried out in long-term to
compensate a continual deviation of the
short-term fuel trim from the central value

Fuel System
Status (Bank 1)

Fuel system
status (bank 1)/
OL, CL, OL
Drive, OL Fault
or CL Fault

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



OL Drive: Open loop due to driving
conditions (fuel enrichment)



OL Fault: Open loop due to
detected system fault



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



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

2008 Toyota Tundra

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

Fuel System
Status (Bank 2)

Fuel system
status (bank 2)/
OL, CL, OL
Drive, OL Fault
or CL Fault

CL: Idling after
warming up



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



OL Drive: Open loop due to driving
conditions (fuel enrichment)



OL Fault: Open loop due to
detected system fault



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

AF FT B1 S1

Short-term fuel
trim associated
with the 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

-

AFS B1 S1

Air fuel ratio
sensor current
bank 1 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 current of
sensor

AF FT B2 S1

Short-term fuel
trim associated
with the 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.: 6513.5X

-

-

2008 Toyota Tundra

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

Catalyst Temp
(B2S1)

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)1 Min.: 0
ohms, Max.:
21247.68 ohms

5 to 15000 ohms

After driving approx. 10 min. in urban
area

Sub O2S
Impedance
B2S2

Sub heated
oxygen sensor
impedance
(bank 2 sensor
2)1 Min.: 0
ohms, Max.:
21247.68 ohms

5 to 15000 ohms

After driving approx. 10 min. in urban
area

Initial Engine
Coolant Temp

Initial engine
coolant
temperature/
Min.: -40°C,
Max.: 120°C

Close to ambient air
temperature

Service data

Initial Intake
Air Temp

Initial intake air
temperature/
Min.: -40°C,
Max.: 120°C

Close to ambient air
temperature

Service data

Injection Volum
(Cylinder1)

Injection
volume
(cylinder 1)/
Min.: 0 ml,
Max.: 2.048 ml

0 to 0.5 ml

Quantity of fuel injection volume for 10
times

Atmospheric

2008 Toyota Tundra

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

Air pump
pressure
(absolute)

Air pump
pressure
(absolute)/
Min.: 0 kPa,
Max.: 320 kPa

pressure +1 kPa or
more: Air pump ON,
Air switching valve
open
Close to atmospheric
pressure: Air pump
OFF, Air switching
valve close

Refer to DTC P2431

Air Pump
Pulsation
Pressure

Air pump
pulsation
pressure/
Min.: 0 kPa,
Max.: 639.9 kPa

-



Cumulative pulsation pressure
calculated by ECM



(see DTC P2431 SECONDARY
AIR INJECTION SYSTEM AIR
FLOW/PRESSURE SENSOR
CIRCUIT
RANGE/PERFORMANCE
BANK 1; DTC P2432
SECONDARY AIR INJECTION
SYSTEM AIR
FLOW/PRESSURE SENSOR
CIRCUIT LOW BANK 1; DTC
P2433 SECONDARY AIR
INJECTION SYSTEM AIR
FLOW/PRESSURE SENSOR
CIRCUIT HIGH BANK 1; DTC
P2436 SECONDARY AIR
INJECTION SYSTEM AIR
FLOW/PRESSURE SENSOR
CIRCUIT
RANGE/PERFORMANCE
BANK 2; DTC P2437
SECONDARY AIR INJECTION
SYSTEM AIR
FLOW/PRESSURE SENSOR
CIRCUIT LOW BANK 2; DTC
P2438 SECONDARY AIR
INJECTION SYSTEM AIR
FLOW/PRESSURE SENSOR
CIRCUIT HIGH BANK 2 )

Air Pump2
Pressure
(Absolute)

Air pump
pressure
(absolute)/
Min.: 0 kPa,
Max.: 320 kPa

Atmospheric
pressure +1 kPa or
more: Air pump ON,
Air switching valve
open
Close to atmospheric
pressure: Air pump
OFF, Air switching
valve close

Refer to DTC P2431

2008 Toyota Tundra

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