Toyota Tundra Service Manual: Terminals Of Ecu

TERMINALS OF ECU

CHECK ECM (for 1UR-FE)

HINT:

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

Terminal No. (Symbols)

Wiring Color

Terminal Description

Condition

Specified Condition

D74-27 (D) - D74-81 (E1)

G - BR

D shift position signal

Ignition switch ON, shift lever in D

11 to 14 V

D74-27 (D) - D74-81 (E1)

G - BR

D shift position signal

Ignition switch ON, shift lever not in D

Below 1 V

A24-25 (S) - D74-81 (E1)

Y - BR

S shift position signal

Ignition switch ON, shift lever in S

11 to 14 V

A24-25 (S) - D74-81 (E1)

Y - BR

S shift position signal

Ignition switch ON, shift lever not in S

Below 1 V

A24-36 (STP) - D74-81 (E1)

SB - BR

Stop light switch assembly signal

Brake pedal depressed

11 to 14 V

A24-36 (STP) - D74-81 (E1)

SB - BR

Stop light switch assembly signal

Brake pedal released

Below 1 V

A24-27 (SFTD) - D74-81 (E1)

BE - BR

Down-shift position switch signal

Ignition switch ON, shift lever in S

11 to 14 V

A24-27 (SFTD) - D74-81 (E1)

BE - BR

Down-shift position switch signal

Ignition switch ON, shift lever in "-"

Below 1 V

A24-38 (SFTU) - D74-81 (E1)

G - BR

Up-shift position switch signal

Ignition switch ON, shift lever in S

11 to 14 V

A24-38 (SFTU) - D74-81 (E1)

G - BR

Up-shift position switch signal

Ignition switch ON, shift lever in "+"

Below 1 V

A24-45 (CCS) - D74-81 (E1)

W - BR

Cruise control main switch circuit

Cruise control main switch (ON-OFF button) not pushed

1 MΩ or higher

A24-45 (CCS) - D74-81 (E1)

W - BR

Cruise control main switch circuit

Cruise control main switch (ON-OFF button) pushed

Below 2.5 Ω

A24-45 (CCS) - D74-81 (E1)

W - BR

Cruise control main switch circuit

+RES switch ON

235 to 245 Ω

A24-45 (CCS) - D74-81 (E1)

W - BR

Cruise control main switch circuit

-SET switch ON

617 to 643 Ω

A24-45 (CCS) - D74-81 (E1)

W - BR

Cruise control main switch circuit

CANCEL switch ON

1509 to 1571 Ω

A24-35 (ST1-) - D74-81 (E1)

G - BR

Stop light switch assembly signal

Ignition switch ON, brake pedal depressed

Below 1 V

A24-35 (ST1-) - D74-81 (E1)

G - BR

Stop light switch assembly signal

Ignition switch ON, brake pedal released

11 to 14 V

CHECK ECM (for 3UR-FE, 3UR-FBE)

HINT:

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

Terminal No. (Symbols)

Wiring Color

Terminal Description

Condition

Specified Condition

D74-49 (D) - D74-81 (E1)

G - BR

D shift position signal

Ignition switch ON, shift lever in D

11 to 14 V

D74-49 (D) - D74-81 (E1)

G - BR

D shift position signal

Ignition switch ON, shift lever not in D

Below 1 V

A24-27 (S) - D74-81 (E1)

Y - BR

S shift position signal

Ignition switch ON, shift lever in S

11 to 14 V

A24-27 (S) - D74-81 (E1)

Y - BR

S shift position signal

Ignition switch ON, shift lever not in S

Below 1 V

A24-7 (STP) - D74-81 (E1)

SB - BR

Stop light switch assembly signal

Brake pedal depressed

11 to 14 V

A24-7 (STP) - D74-81 (E1)

SB - BR

Stop light switch assembly signal

Brake pedal released

Below 1 V

A24-47 (SFTD) - D74-81 (E1)

BE - BR

Down-shift position switch signal

Ignition switch ON, shift lever in S

11 to 14 V

A24-47 (SFTD) - D74-81 (E1)

BE - BR

Down-shift position switch signal

Ignition switch ON, shift lever in "-"

Below 1 V

A24-39 (SFTU) - D74-81 (E1)

G - BR

Up-shift position switch signal

Ignition switch ON, shift lever in S

11 to 14 V

A24-39 (SFTU) - D74-81 (E1)

G - BR

Up-shift position switch signal

Ignition switch ON, shift lever in "+"

Below 1 V

A24-60 (CCS) - A24-59 (ECCS)

W - BR

Cruise control main switch circuit

Cruise control main switch (ON-OFF button) not pushed

1 MΩ or higher

A24-60 (CCS) - A24-59 (ECCS)

W - BR

Cruise control main switch circuit

Cruise control main switch (ON-OFF button) pushed

Below 2.5 Ω

A24-60 (CCS) - A24-59 (ECCS)

W - BR

Cruise control main switch circuit

+RES switch ON

235 to 245 Ω

A24-60 (CCS) - A24-59 (ECCS)

W - BR

Cruise control main switch circuit

-SET switch ON

617 to 643 Ω

A24-60 (CCS) - A24-59 (ECCS)

W - BR

Cruise control main switch circuit

CANCEL switch ON

1509 to 1571 Ω

A24-8 (ST1-) - D74-81 (E1)

G - BR

Stop light switch assembly signal

Ignition switch ON, brake pedal depressed

Below 1 V

A24-8 (ST1-) - D74-81 (E1)

G - BR

Stop light switch assembly signal

Ignition switch ON, brake pedal released

11 to 14 V

NOTICE:

Do not apply excessive force to the connector. If a force of 10 kg or more is applied, the connector may be broken.

CHECK FORWARD RECOGNITION CAMERA

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

W9-8 (BZ) - W9-10 (GND)

SB - W-B

Skid control buzzer output

Ignition switch to ON, buzzer not sounding

11 to 14 V

Ignition switch to ON, buzzer sounding

Below 1 V

W9-7 (IGB) - W9-10 (GND)

R - W-B

Power source

Ignition switch to ON

11 to 14 V

Ignition switch off

Below 1 V

W9-5 (CA1P) - W9-10 (GND)

BE - W-B

CAN communication signal

Ignition switch to ON

Pulse generation

(See waveform 1)

W9-11 (CA1N) - W9-10 (GND)

W - W-B

CAN communication signal

Ignition switch to ON

Pulse generation

(See waveform 2)

W9-6 (CANH) - W9-10 (GND)

G - W-B

CAN communication signal

Ignition switch to ON

Pulse generation

(See waveform 1)

W9-12 (CANL) - W9-10 (GND)

W - W-B

CAN communication signal

Ignition switch to ON

Pulse generation

(See waveform 2)

W9-3 (LKSW) - W9-10 (GND)

L - W-B

Steering pad switch assembly signal (distance control signal)

Ignition switch to ON, steering pad switch assembly (distance control switch) off

4.75 to 5.25 V

Ignition switch to ON, steering pad switch assembly (distance control switch) on

Below 1 V

W9-10 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

(a) Waveform 1

(1) CAN communication signal

Item

Content

Tester Connection

  • Between W9-5 (CA1P) and W9-10 (GND)
  • Between W9-6 (CANH) and W9-10 (GND)

Tool Setting

1 V/DIV., 10 μsec./DIV.

Condition

Ignition switch to ON

HINT:

The waveform varies depending on the CAN communication signal.

(b) Waveform 2

(1) CAN communication signal

Item

Content

Tester Connection

  • Between W9-11 (CA1N) and W9-10 (GND)
  • Between W9-12 (CANL) and W9-10 (GND)

Tool Setting

1 V/DIV., 10 μsec./DIV.

Condition

Ignition switch to ON

HINT:

The waveform varies depending on the CAN communication signal.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

d1-1 (SGND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

d1-2 (CA2L) - d1-1 (SGND)

W - W-B

CAN communication signal

Ignition switch to ON

Pulse generation

(See waveform 2)

d1-3 (CA2H) - d1-1 (SGND)

R - W-B

CAN communication signal

Ignition switch to ON

Pulse generation

(See waveform 1)

d1-5 (CA1P) - d1-1 (SGND)

Y - W-B

CAN communication signal

Ignition switch to ON

Pulse generation

(See waveform 1)

d1-6 (CA1N) - d1-1 (SGND)

W - W-B

CAN communication signal

Ignition switch to ON

Pulse generation

(See waveform 2)

d1-8 (IGB) - d1-1 (SGND)

R - W-B

Power source

Ignition switch to ON

11 to 14 V

CHECK MILLIMETER WAVE RADAR SENSOR

(a) Waveform 1

(1) CAN communication signal

Item

Content

Tester Connection

  • Between d1-3 (CA2H) and d1-1 (SGND)
  • Between d1-5 (CA1P) and d1-1 (SGND)

Tool Setting

1 V/DIV., 10 μsec./DIV.

Condition

Ignition switch to ON

HINT:

The waveform varies depending on the CAN communication signal.

(b) Waveform 2

(1) CAN communication signal

Item

Content

Tester Connection

  • Between d1-2 (CA2L) and d1-1 (SGND)
  • Between d1-6 (CA1N) and d1-1 (SGND)

Tool Setting

1 V/DIV., 10 μsec./DIV.

Condition

Ignition switch to ON

HINT:

The waveform varies depending on the CAN communication signal.

    System Diagram

    Lost Communication with ECM / PCM "A" (U0100,U0104,U0122,U0125,U0126,U0129,U0137)

    See More:

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