Toyota Tundra. Manual — part 1483

HINT:

Due to the factors listed below, cold engine starting trouble, rough idle, poor driveability, and engine stall may
occur:



The vehicle is filled with fuel that has an alcohol concentration of 100% (E100).



The Data List item "Alcohol Density Learning" on the Techstream is "Incmpl" (if "Alcohol Density
Learning" is "Incmpl", this means that the alcohol concentration learning has not been completed).



"Alcohol Density Learning" does not change to "Incmpl" even though the vehicle is refueled (if the
amount refueled is 2 gallons or less, or the fuel sender gauge is malfunctioning, "Alcohol Density
Learning" may not change to "Incmpl"). The ECM does not perform alcohol concentration learning if
"Alcohol Density Learning" does not change to "Incmpl". If alcohol concentration learning is not
performed, the ECM cannot command the injectors to inject the appropriate amount of fuel for
combustion.

TERMINALS OF ECM

1. CHECK ECM

Fig. 16: Identifying Terminals Of ECM Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

a. Measure the voltage according to the value(s) in the table below.

HINT:

The standard normal voltage between each pair of ECM terminals is shown in the table below. The
appropriate conditions for checking each pair of terminals are also indicated. The result of checks
should be compared with the standard normal voltage for that pair of terminals, displayed in the
Specified Condition column. The illustration above can be used as a reference to identify the ECM
terminal locations.

Engine stalls only during A/C
operation

A/C signal circuit (for Manual
Air Conditioning System)

TERMINALS OF ECU

ECM

TERMINALS OF ECM

Unable/difficult to refuel

Refueling valve (canister)

-

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

VOLTAGE SPECIFIED CONDITION

Terminal No.

(Symbols)

Wiring

Color

Terminal Description

Condition

Specified

Condition

A24-1 (BATT)
- D74-81 (E1)

L - BR

Battery (for measuring
battery voltage arid for
ECM memory)

Always

11 to 14 V

D74-41 (+BM)
- D74-81 (E1)

P - BR

Power source of throttle
actuator

Always

11 to 14 V

A24-28 (IGSW)
- D74-81 (E1)

LG - BR Ignition switch

Ignition switch ON

11 to 14 V

A24-3 (+B) -
D74-81 (E1)

GR - BR Power source of ECM

Ignition switch ON

11 to 14 V

A24-2 (+B2) -
D74-81 (E1)

GR - BR Power source of ECM

Ignition switch ON

11 to 14 V

D74-58 (OC1+)
- D74-57 (OC1-
)

B - B-L

Camshaft timing oil control
valve (OCV) (for Intake
Side of Bank 1)

Idling

Pulse generation
(see waveform 1

a)

D74-52 (OC2+)
- D74-51 (OC2-
)

L-B - R-

B

Camshaft timing oil control
valve (OCV) (for Intake
Side of Bank 2)

Idling

Pulse generation
(see waveform 1

a)

D74-56 (OE1+)
- D74-55 (OE1-
)

L-W -

L-B

Camshaft timing oil control
valve (OCV) (for Exhaust
Side of Bank 1)

Idling

Pulse generation
(see waveform 1

a)

D74-50 (OE2+)
- D74-49 (OE2-
)

L-R - L

Camshaft timing oil control
valve (OCV) (for Exhaust
Side of Bank 2)

Idling

Pulse generation
(see waveform 1

a)

A24-34
(MREL) - D74-
81 (E1)

W - BR EFI relay

Ignition switch ON

11 to 14 V

D74-74 (VG) -
D74-75 (E2G)

L-Y - G-

W

Mass air flow meter

Idling, Shift lever position
P or N, A/C switch OFF

0.5 to 3.0 V

D74-73 (THA) -
D74-97
(ETHW)

Y-B -

BR

Intake air temperature
sensor

Idling, Intake air
temperature 20°C (68°F)

0.5 to 3.4 V

D74-76 (THW)
- D74-98
(ETHA)

G-B -

BR

Engine coolant temperature
sensor

Idling, Engine coolant
temperature 80°C (176°F)

0.2 to 1.0 V

D74-80
(VCTA) - D74-
79 (ETA)

Y - L

Power source of throttle
position sensor (specific
voltage)

Ignition switch ON

4.5 to 5.5 V

D74-78 (VTA1)
- D74-79 (ETA)

R-Y - L

Throttle position sensor
(for engine control)

Ignition switch ON,
Throttle valve fully closed

0.5 to 1.2 V

Ignition switch ON,

Throttle valve fully open

3.2 to 4.8 V

Ignition switch ON,

2.1 to 3.1 V

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

D74-77 (VTA2)
- D74-79 (ETA)

Y-B - L

Throttle position sensor
(for sensor malfunction
detection)

Throttle valve fully closed

Ignition switch ON,

Throttle valve fully open

4.5 to 5.5 V

A24-55 (VPA) -
A24-58 (EPA)

W - BE

Accelerator pedal position
sensor (for engine control)

Ignition switch ON,
Accelerator pedal released

0.5 to 1.1 V

Ignition switch ON,

Accelerator pedal fully

depressed

2.6 to 4.5 V

A24-56 (VPA2)
- A24-60
(EPA2)

LG - BR

Accelerator pedal position
sensor (for sensor
malfunctioning detection)

Ignition switch ON,
Accelerator pedal released

1.2 to 2.0 V

Ignition switch ON,

Accelerator pedal fully

depressed

3.4 to 5.3 V

A24-57 (VCPA)
- A24-58 (EPA)

B - BE

Power source of accelerator
pedal position sensor (for
VPA)

Ignition switch ON

4.5 to 5.5 V

A24-59 (VCP2)
- A24-60
(EPA2)

V - BR

Power source of accelerator
pedal position sensor (for
VPA2)

Ignition switch ON

4.5 to 5.5 V

D74-22 (HA1A)
- D74-23 (E04)

L - W-B A/F sensor heater

Idling

Below 3.0 V

Ignition switch ON

11 to 14 V

D74-20 (HA2A)
- D74-21 (E05)

G - W-B A/F sensor heater

Idling

Below 3.0 V

Ignition switch ON

11 to 14 V

D74-126
(A1A+) - D74-
81 (E1)

G - BR A/F sensor

Ignition switch ON

3.3 V*

D74-125 (A1A-
) - D74-81 (E1)

R - BR A/F sensor

Ignition switch ON

2.9 V*

D74-103
(A2A+) - D74-
81 (E1)

P - BR A/F sensor

Ignition switch ON

3.3 V*

D74-102 (A2A-
) - D74-81 (E1)

L - BR A/F sensor

Ignition switch ON

2.9 V*

D74-45 (HT1B)
- D74-46 (E03)

G-B -

W-B

Heated oxygen sensor
heater

Idling

Below 3.0 V

Ignition switch ON

11 to 14 V

D74-44 (HT2B)
- D74-46 (E03)

B - W-B

Heated oxygen sensor
heater

Idling

Below 3.0 V

Ignition switch ON

11 to 14 V

D74-114
(OX1B) - D74-
115 (EX1B)

G - L

Heated oxygen sensor

Engine speed maintained
at 2500 RPM for 2
minutes after warming up
sensor

Pulse generation
(see waveform 2

b)

D74-112
(OX2B) - D74-
113 (EX2B)

R - W Heated oxygen sensor

Engine speed maintained
at 2500 RPM for 2
minutes after warming up

Pulse generation
(see waveform 2

b)

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

sensor

D74-86 (#10) -
D74-43 (E01)

R-L -

W-B

Injector

Ignition switch ON

11 to 14 V

Idling

Pulse generation
(see waveform 3
c)

D74-109 (#20) -
D74-43 (E01)

L - W-B Injector

Ignition switch ON

11 to 14 V

Idling

Pulse generation
(see waveform 3
c)

D74-85 (#30) -
D74-43 (E01)

R - W-B Injector

Ignition switch ON

11 to 14 V

Idling

Pulse generation
(see waveform 3
c)

D74-108 (#40) -
D74-43 (E01)

Y - W-B Injector

Ignition switch ON

11 to 14 V

Idling

Pulse generation
(see waveform 3
c)

D74-84 (#50) -
D74-43 (E01)

G - W-B Injector

Ignition switch ON

11 to 14 V

Idling

Pulse generation
(see waveform 3
c)

D74-107 (#60) -
D74-43 (E01)

R - W-B Injector

Ignition switch ON

11 to 14 V

Idling

Pulse generation
(see waveform 3
c)

D74-83 (#70) -
D74-43 (E01)

W - W-

B

Injector

Ignition switch ON

11 to 14 V

Idling

Pulse generation
(see waveform 3
c)

D74-106 (#80) -
D74-43 (E01)

R-B -

W-B

Injector

Ignition switch ON

11 to 14 V

Idling

Pulse generation
(see waveform 3
c)

D74-94 (KNK1)
- D74-93
(EKNK)

R - G Knock sensor

Engine speed maintained
at 4000 RPM after
warming up engine

Pulse generation
(see waveform 3

d)

D74-117
(KNK2) - D74-
116 (EKN2)

W - B Knock sensor

Engine speed maintained
at 4000 RPM after
warming up engine

Pulse generation
(see waveform 4

d)

D74-96 (KNK3)
- D74-95
(EKN3)

W - B Knock sensor

Engine speed maintained
at 4000 RPM after
warming up engine

Pulse generation
(see waveform 4

d)

D74-119
(KNK4) - D74-
118 (EKN4)

R - G Knock sensor

Engine speed maintained
at 4000 RPM after
warming up engine

Pulse generation
(see waveform 4

d)

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra