Toyota Tundra. Manual — part 1131

TERMINALS OF ECM

Fig. 16: Identifying ECM Connectors Terminals

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.

Compression

ON-VEHICLE INSPECTION

Engine stalls soon after starting

Fuel pump control circuit

FUEL PUMP CONTROL
CIRCUIT

Spark plug

IGNITION COIL AND SPARK
PLUG

Ignition system

ON-VEHICLE INSPECTION

Injector

FUEL INJECTOR

Variable valve timing system

CAMSHAFT OIL CONTROL
VALVE

Electronic throttle control system THROTTLE BODY
Air induction system

ON-VEHICLE INSPECTION

PCV hose

ON-VEHICLE INSPECTION

Compression

ON-VEHICLE INSPECTION

Engine stalls only during A/C
operation

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

TERMINALS OF ECU

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

TERMINALS OF ECU

ECM

TERMINALS OF ECM

Unable/difficult to refuel

Refueling valve (canister)

CANISTER

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

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.

ECM TERMINAL REFERENCE

Terminal No.

(Symbols)

Wiring

Colors

Terminal Descriptions

Conditions

Specified

Condition

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

L - BR

Battery (for measuring the
battery voltage and for the
ECM memory)

Always

11 to 14 V

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

P - BR

Power source of throttle
motor

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-)

L-B - R-

B

Camshaft timing oil control
valve (OCV for bank 1)

Ignition switch ON

Pulse generation

(See 1waveform 1)

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

B - B-L

Camshaft timing oil control
valve (OCV for bank 2)

Ignition switch ON

Pulse generation

(See 1waveform 1)

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

W - BR EFI relay

Ignition switch ON

11 to 14 V

D74-67 (VCV1)
- D74-97
(ETHW)

L - BR

Power source of sensor
(specific voltage)

Ignition switch ON

4.5 to 5.5 V

D74-66 (VCV2)
- D74-98
(ETHA)

L - BR

Power source of sensor
(specific voltage)

Ignition switch ON

4.5 to 5.5 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) -
D74-98 (ETHA)

Y-B -

BR

Intake air temperature sensor

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

0.5 to 3.4 V

D74-76 (THW) -
D74-97 (ETHW)

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)

L - B

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-B

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, Throttle

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

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

Y - B-B

Throttle position sensor (for
sensor malfunction
detection)

valve fully closed

2.1 to 3.1 V

Ignition switch ON, Throttle

valve fully open

4.5 to 5.0 V

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

W - O

Accelerator pedal position
sensor (for engine control)

Ignition switch ON,
Accelerator pedal fully
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
malfunction detection)

Ignition switch ON,
Accelerator pedal fully
released

1.2 to 2.0 V

Ignition switch ON,

Accelerator pedal fully

depressed

3.4 to 5.0 V

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

B - O

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

L - W-B

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

(1)

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

V - BR A/F sensor

Ignition switch ON

3.3 V

(1)

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

R - BR A/F sensor

Ignition switch ON

2.9 V

(1)

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

P - BR A/F sensor

Ignition switch ON

2.9 V

(1)

D74-45 (HT1B)
- D74-81 (E1)
D74-44 (HT2B)
- D74-81 (E1)

G - BR
B - BR

Heated oxygen sensor heater

Idling

Below 3.0 V

Ignition switch ON

11 to 14 V

D74-114
(OX1B) - D74-
115 (EX1B)
D74-112
(OX2B) - D74-
113 (EX2B)

W - BR

B - BR

Heated oxygen sensor

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

Pulse generation

(See 2waveform 2)

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

R-L - W-

B

Ignition switch ON

11 to 14 V

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

L - W-B

Injector

Idling

Pulse generation

(See 3waveform 3)

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

R - W-B

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

Y - W-B

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

G - W-B

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

R - W-B

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

G - R

Knock sensor (bank 1)

Engine speed maintained at
4000 RPM after warming
up

Pulse generation

(See 4waveform 4)

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

W - B Knock sensor (bank 2)

Engine speed maintained at
4000 RPM after warming
up

Pulse generation

(See 4waveform 4)

D74-90 (VV1+)
- D74-89 (VV1-)

R - L-R

Variable valve timing
(VVT) sensor (bank 1)

Idling

Pulse generation

(See 5waveform 5)

D74-87 (VV2+)
- D74-88 (VV2-)

R - G

Variable valve timing
(VVT) sensor (bank 2)

Idling

Pulse generation

(See 5waveform 5)

D74-110 (NE+) -
D74-111 (NE-)

B - W Crankshaft position sensor

Idling

Pulse generation

(See 5waveform 5)

D74-40 (IGT1) -
D74-81 (E1)

B-R - BR

Ignition coil (ignition signal) Idling

Pulse generation

(See 6waveform 6)

D74-39 (IGT2) -
D74-81 (E1)

L-Y - BR

D74-38 (IGT3) -
D74-81 (E1)

B - BR

D74-37 (IGT4) -
D74-81 (E1)

L-B - BR

D74-36 (IGT5) -
D74-81 (E1)

G-R -

BR

D74-35 (IGT6) -
D74-81 (E1)

G - BR

D74-104 (IGF1)
- D74-81 (E1)

G-B -

BR

Ignition coil (ignition
confirmation signal)

Ignition switch ON

4.5 to 5.5 V

Idling

Pulse generation
(See 6waveform 6)

D74-63 (PRG) -
D74-81 (E1)

L-B - BR Purge VSV

Ignition switch ON

11 to 14 V

Idling

Pulse generation
(See 7waveform 7)

A24-13 (SPD) -
D74-81 (E1)

B - BR

Speed signal from
combination meter

Ignition switch ON, Driving
wheel rotated slowly

Pulse generation

(See 8waveform 8)

A24-46 (STA) -
D74-81 (E1)

R - BR Starter signal

Cranking

11 to 14 V

A24-36 (STP) -

Brake pedal depressed

7.5 to 14 V

2008 Toyota Tundra

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