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)

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

    System Diagram

    Lost Communication With Vehicle Dynamics Control Module (U0122)

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