Toyota Tundra Service Manual: Terminals Of Ecm

TERMINALS OF ECM

1. CHECK ECM

HINT:

The standard voltage at each ECM terminal is shown in the table below.

In the table, first follow the information under "Condition". Look under "Terminal No. (Symbol)" for the terminals to inspect. The standard voltage between the terminals is shown under "Specified Condition".

Use the illustration above as a reference for the ECM terminals.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

D74-120 (NSW) - D74-81 (E1)

L - BR

PNP switch signal

  • Ignition switch ON
  • Shift lever in P or N

Below 1 V

  • Ignition switch ON
  • Shift lever not in P or N

11 to 14 V

D74-2 (P) - D74-81 (E1)

G-B - BR

P shift position switch signal

  • Ignition switch ON
  • Shift lever in P

11 to 14 V

  • Ignition switch ON
  • Shift lever not in P

Below 1 V

D74-26 (R) - D74-81 (E1)

L-R - BR

R shift position switch signal

  • Ignition switch ON
  • Shift lever in R

11 to 14 V

  • Ignition switch ON
  • Shift lever not in R

Below 1 V

D74-25 (N) - D74-81 (E1)

G-W - BR

N shift position switch signal

  • Ignition switch ON
  • Shift lever in N

11 to 14 V

  • Ignition switch ON
  • Shift lever not in N

Below 1 V

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

G - BR

D shift position switch signal

  • Ignition switch ON
  • Shift lever in D

11 to 14 V

  • Ignition switch ON
  • Shift lever not in D

Below 1 V

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

Y - BR

S shift position switch signal

  • Ignition switch ON
  • Shift lever in S

11 to 14 V

  • Ignition switch ON
  • Shift lever not in S

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

  • Ignition switch ON
  • Shift lever in "+" (up-shift)

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

  • Ignition switch ON
  • Shift lever in "-" (down-shift)

Below 1 V

D74-7 (S1) - D74-81 (E1)

R - BR

S1 solenoid signal

1st gear

Below 1 V

Not in 1st gear

11 to 14 V

D74-6 (S2) - D74-81 (E1)

W - BR

S2 solenoid signal

1st, 2nd or 6th gear

11 to 14 V

3rd, 4th or 5th gear

Below 1 V

D74-3 (S3) - D74-81 (E1)

G-W - BR

S3 solenoid signal

1st, 2nd or 3rd gear

11 to 14 V

4th, 5th or 6th gear

Below 1 V

D74-5 (S4) - D74-81 (E1)

G-R - BR

S4 solenoid signal

5th or 6th gear

11 to 14 V

1st, 2nd, 3rd or 4th gear

Below 1 V

D74-4 (SR) - D74-81 (E1)

G - BR

SR solenoid signal

1st, 2nd, 3rd or 4th gear

11 to 14 V

5th or 6th gear

Below 1 V

D74-14 (SL1+) - D74-15 (SL1-)

Y - L

SL1 solenoid signal

5th or 6th gear

Pulse generation

D74-12 (SL2+) - D74-13 (SL2-)

G-R - L-W

SL2 solenoid signal

Engine is idling

Pulse generation

D74-9 (SLT+) - D74-8 (SLT-)

B - G-B

SLT solenoid signal

Engine is idling

Pulse generation

D74-10 (SLU+) - D74-11 (SLU-)

L-Y - L-R

SLU solenoid signal

5th gear (lock-up) or 6th gear (lock-up)

Pulse generation

D74-122 (THO1) - D74-98 (E2)

G-Y - BR

No. 1 ATF temperature sensor signal

No. 1 ATF temperature: 115°C (239°F) or more

Below 1.5 V

D74-99 (THO2) - D74-98 (E2)

L - BR

No. 2 ATF temperature sensor signal

No. 2 ATF temperature: 115°C (239°F) or more

Below 1.5 V

D74-101 (SP2+) - D74-100 (SP2-)

Y - B

Speed sensor SP2 signal

Vehicle speed 20 km/h (12 mph)

Pulse generation

(see waveform 1)

D74-124 (NT+) - D74-123 (NT-)

Y - B

Speed sensor NT signal

Engine idling

(shift lever in P or N)

Pulse generation

(see waveform 2)

A24-10 (CANH) - D74-81 (E1)

GR - BR

CAN communication line

Ignition switch ON

Pulse generation

(see waveform 3)

A24-11 (CANL) - D74-81 (E1)

W - BR

CAN communication line

Ignition switch ON

Pulse generation

(see waveform 4)

(a) Using an oscilloscope, check waveform 1.

Reference

Terminal No. (Symbol)

Tool Setting

Condition

D74-101 (SP2+) - D74-100 (SP2-)

2 V/DIV., 20 msec./DIV.

Vehicle speed 20 km/h (12 mph)

(b) Using an oscilloscope, check waveform 2.

Reference

Terminal No. (Symbol)

Tool Setting

Condition

D74-124 (NT+) - D74-123 (NT-)

1 V/DIV., 2 msec./DIV.

Engine idling (shift lever in P or N)

(c) Using an oscilloscope, check waveform 3.

Reference

Terminal No. (Symbol)

Tool Setting

Condition

A24-10 (CANH) - D74-81 (E1)

1 V/DIV., 10 μsec./DIV.

Ignition switch ON

(d) Using an oscilloscope, check waveform 4.

Reference

Terminal No. (Symbol)

Tool Setting

Condition

A24-11 (CANL) - D74-81 (E1)

1 V/DIV., 10 μsec./DIV.

Ignition switch ON

    System Diagram

    Transmission Control Switch Circuit

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