Toyota Tundra. Manual — part 1312

P0031, P0032, P0051 and
P0052

(A/F) Sensor
Heater

ECM turns off A/F sensor heater.

Ignition switch off

P0037, P0038, P0057 and
P0058

Heated Oxygen
(HO2) Sensor
Heater

ECM turns off HO2 sensor heater.

Ignition switch off

P0102 and P0103

Mass Air Flow
(MAF) Meter

ECM calculates ignition timing
according to engine speed and throttle
valve position.

Pass condition
detected

P0110, P0112 and P0113

Intake Air
Temperature
(IAT) Sensor

ECM estimates IAT to be 20°C (68°F).

Pass condition
detected

P0115, P0117 and P0118

Engine Coolant
Temperature
(ECT) Sensor

ECM estimates ECT to be 80°C (176°
F).

Pass condition
detected

P0120, P0121, P0122,
P0123, P0220, P0222,
P0223, P0604, P0606,
P060A, P060D, P060E,
P0657, P2102, P2103,
P2111, P2112, P2118,
P2119 and P2135

Electronic
Throttle Control
System (ETCS)

ECM cuts off throttle actuator current
and throttle valve returned to 7° throttle
position by return spring.
ECM then adjusts engine output by
controlling fuel injection (intermittent
fuel-cut) and ignition timing in
accordance with accelerator pedal
opening angle to allow vehicle to
continue at minimal speed*.

Pass condition
detected and then
ignition switch
turned off

P0327, P0328, P0332 and
P0333

Knock Sensor

ECM sets ignition timing to maximum
retard.

Ignition switch off

P0351 to P0358

Igniter

ECM cuts fuel.

Pass condition
detected

P0504

Stop Light
Switch

Accelerator pedal angle is fixed.

Accelerator pedal
angle is fixed

P2120, P2121, P2122,
P2123, P2125, P2127,
P2128 and P2138

Accelerator
Pedal Position
(APP) Sensor

APP sensor has 2 sensor circuits: Main
and Sub.
If either circuit malfunctions, ECM
controls engine using other circuit.
If both circuits malfunction, ECM
regards accelerator pedal as being
released. As a result, throttle valve
closed and engine idles.

Pass condition
detected and then
ignition switch
turned off

P2432, P2433, P2437 and
P2438

Secondary Air
Injection System

Throttle valve opening angle control is
performed

Pass condition
detected

P2440 and P2442

Secondary Air
Injection System

Throttle valve opening angle control is
performed

Pass condition
detected

P2445 and P2447

Secondary Air
Injection System

Throttle valve opening angle control is
performed

Pass condition
detected

HINT:
*: The vehicle can be driven slowly when the accelerator pedal is depressed firmly and slowly. If the
accelerator pedal is depressed quickly, the vehicle may speed up and slow down erratically.

2008 Toyota Tundra

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

DATA LIST/ACTIVE TEST

1. DATA LIST

HINT:

Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and
other items to be read without removing any parts. This non-intrusive inspection can be very useful
because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading
the Data List information early in troubleshooting is one way to save diagnostic time.

a. Warm up the engine.

b. Turn the ignition switch off.

c. Connect the Techstream to the DLC3.

d. Turn the ignition switch to ON.

e. Turn the Techstream ON.

f. Enter the following menus: Powertrain/Engine and ECT/Data List.

g. According to the display on the Techstream, use the Data List.

DATA LIST REFERENCE

NOTE:

In the table below, the values listed under "Normal Condition" are
reference values. Do not depend solely on these reference values when
deciding whether a part is faulty or not.

Tester Display

Measurement

Item/Range

Normal Condition

Diagnostic Note

Injector (Port)

Injection period
of the No. 1
cylinder
Min.: 0 ms.
Max.: 32.64 ms

2.0 to 4.0 ms: idling

-

IGN Advance

Ignition timing
advance for No.
1 cylinder
Min.: -64 deg.,
Max.: 63.5 deg.

BTDC 5 to 15°:
Idling

-

Calculate Load

Calculated load
by ECM/
Min.: 0%, Max.:
100%



11 to 25%:
Idling



12 to 26%:
Running
without load
(2500 RPM)

-

Vehicle Load

Vehicle load/
Min.: 0%, Max.:

Actual vehicle load

-

2008 Toyota Tundra

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

25700%

MAF

Air flow rate
from Mass Air
Flow (MAF)
meter
Min.: 0 g/sec,
Max.: 655 g/sec.

4.0 to 8.0 g/sec.:
Idling

If the value approximately 0.0 g/sec:



Mass air flow meter power source
circuit open



VG circuit open or short if the value
160.0 g/sec. or more:



E2G circuit open

Engine Speed

Engine speed
Min.: 0 RPM,
Max.: 16383
RPM

650 to 750 RPM:
Idling

-

Vehicle Speed

Vehicle speed
Min.: 0 km/h,
Max.: 255 km/h

Actual vehicle speed Speed indicated on speedometer

Coolant Temp

Engine coolant
temperature:
Min.: -40°C,
Max.: 140°C

80 to 100°C (176 to
212°F): After
warming up

If the value -40°C (-40°F): sensor circuit
open
If the value 140°C (284°F): sensor circuit
shorted

Intake Air

Intake air
temperature
Min.: -40°C,
Max.: 140°C

Equivalent to
ambient air
temperature

If the value -40°C (-40°F): sensor circuit
open
If the value 140°C (284°F): sensor circuit
shorted

2nd Air System
Status

Secondary air
system status
ON or OFF

ON: Secondary air
system operation

-

Air-Fuel Ratio

Air fuel ratio:
Min.: 0, Max.:
1.999

0.8 to 1.2: During
idling

-

Purge Density
Learn Value

Learning value
of purge density
Min.: -50, Max.:
350

Idling: -40 to 0%

Service data

Evap Purge
Flow

Purge flow
Min.: 0%, Max.:
102.4%

0 to 100%: Idling

-

EVAP (Purge)
VSV

Purge VSV
control duty
Min.: 0%, Max.:
100%

0 to 100%: During
idling

Order signal from ECM

Vapor Pressure
Pump

Vapor pressure/
Min.: 33.853
kPa, Max.:
125.596 kPa

Approximately 100
kPa: Ignition switch
ON

EVAP system pressure monitored by
canister pressure sensor

Calculated

2008 Toyota Tundra

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

Vapor Pressure
(Calculated)

EVAP system
pressure/
Min.: -5.632
kPa, Max.:
715.264 kPa

Approximately 100
kPa: Ignition switch
ON

-

Knock Correct
Learn Value

Correction
learning value of
knocking/
Min.:-64 CA,
Max.: 1984 CA

0 to 22°CA:
Driving, 70 km/h (44
mph)

Service data

Knock
Feedback Value

Feedback value
of knocking/
Min.: -64 CA,
Max.: 1984 CA

-22 to 0°CA:
Driving, 70 km/h (44
mph)

Service data

Clutch Current

Clutch current/
Min.: 0 A, Max.:
2.49 A

-

-

Accelerator
Position No.1

Absolute
Accelerator
Pedal Position
(APP) No. 1/
Min.: 0%, Max.:
100%

10 to 22%:
accelerator pedal is
released
54 to 86%:
accelerator pedal is
fully depressed

-

Accelerator
Position No.2

Absolute APP
No. 2/
Min.: 0%, Max.:
100%

12 to 42%:
accelerator pedal is
released
66 to 98%:
accelerator pedal is
fully depressed

-

Accelerator
Position No.1

APP sensor No.
1 voltage/
Min.: 0 V, Max.:
4.98 V

-

ETCS freeze data

Accelerator
Position No.2

APP sensor No.
2 voltage/
Min.: 0 V, Max.:
4.98 V

-

ETCS freeze data

Accelerator
Position No.1

APP sensor No.
1 voltage/
Min.: 0 V, Max.:
5 V

0.5 to 1.1 V:
accelerator pedal is
released
2.6 to 4.5 V:
accelerator pedal is
fully depressed

-

Accelerator

APP sensor No.
2 voltage/

1.2 to 2.0 V:
accelerator pedal is
released

-

2008 Toyota Tundra

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