Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Terminals Of Ecu

TERMINALS OF ECU

1. CHECK 4 WHEEL DRIVE CONTROL ECU

Text in Illustration

*a

Component with harness connected

(4 Wheel Drive Control ECU)

-

-

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

F13-1 (4WD) - F12-10 (GND)

BE - W-B*3

LG - W-B*4

4WD detection switch signal input

Ignition switch ON

Transfer position 2WD

10 to 14 V

Ignition switch ON

Transfer position 4WD

Below 1.5 V

F13-2 (ADD) - F12-10 (GND)

G - W-B

A.D.D. position switch input

Ignition switch ON

Transfer position 2WD (A.D.D. actuator Free)

10 to 14 V

Ignition switch ON

Transfer position 4WD (A.D.D. actuator Lock)

Below 1.5 V

F13-3 (4WDL) - F12-10 (GND)

Y - W-B

L4 detection switch signal input

Ignition switch ON

Transfer position not in L4

10 to 14 V

Ignition switch ON

Transfer position L4

Below 1.5 V

F13-5 (DT) - F13-25 (DGND)

BE - V

Oil temperature sensor signal input

Ignition switch ON

0.9 to 4.9 V

F13-7 (DL2) - F12-10 (GND)

P - W-B

A.D.D. actuator limit switch input

Ignition switch ON

Transfer position 2WD (A.D.D. actuator Free)

10 to 14 V

Ignition switch ON

Transfer position 4WD (A.D.D. actuator Lock)

Below 1.5 V

F13-8 (DL1) - F12-10 (GND)

LG - W-B

A.D.D. actuator limit switch input

Ignition switch ON

Transfer position 2WD (A.D.D. actuator Free)

Below 1.5 V

Ignition switch ON

Transfer position 4WD (A.D.D. actuator Lock)

10 to 14 V

F13-9 (TL3) - F12-10 (GND)

B - W-B

Transfer shift actuator limit switch input

Ignition switch ON

TL3 terminal limit switch off (transfer 2WD or L4)

10 to 14 V

Ignition switch ON

TL3 terminal limit switch on (transfer H4)

Below 1.5 V

F13-10 (TL2) - F12-10 (GND)

SB - W-B

Transfer shift actuator limit switch input

Ignition switch ON

TL2 terminal limit switch off (transfer 2WD or H4)

10 to 14 V

Ignition switch ON

TL2 terminal limit switch on (transfer L4)

Below 1.5 V

F13-11 (TL1) - F12-10 (GND)

Y - W-B

Transfer shift actuator limit switch input

Ignition switch ON

TL1 terminal limit switch off (transfer H4 or L4)

10 to 14 V

Ignition switch ON

TL1 terminal limit switch on (transfer 2WD)

Below 1.5 V

F13-13 (LO) - F12-10 (GND)

V - W-B

Transfer position switch input

Ignition switch ON

Transfer position switch 2WD

10 to 14 V

Ignition switch ON

Transfer position switch H4

Below 1.5 V

Ignition switch ON

Transfer position switch L4

Below 1.5 V

F13-14 (2-4) - F12-10 (GND)

GR - W-B

Transfer position switch input

Ignition switch ON

Transfer position switch 2WD

Below 1.5 V

Ignition switch ON

Transfer position switch H4

Below 1.5 V

Ignition switch ON

Transfer position switch L4

10 to 14 V

F13-18 (MTN) - F12-10 (GND)*2

V - W-B

Clutch start switch input

Ignition switch ON

Clutch pedal released

10 to 14 V

Ignition switch ON

Clutch pedal depressed

Below 2 V

F13-20 (CANH) - F13-40 (CANL)

BE - W

HIGH-level CAN bus wire - LOW-level CAN bus wire

Ignition switch off

Cable disconnected from negative (-) battery terminal

54 to 69 Ω

F13-21 (+B) - F12-10 (GND)

W - W-B

ECU power supply

Always

11 to 14 V

F12-2 (DM1) - F12-10 (GND)

R - W-B

A. D. D. shift motor output

Ignition switch ON

Transfer position switch H4 to 2WD

(during A.D.D. actuator Lock to Free operation)

Pulse generation

(see waveform 1)

F12-4 (IG) - F12-10 (GND)

Y - W-B

ECU and actuator power supply

Ignition switch ON

11 to 14 V

F12-6 (DM2) - F12-10 (GND)

SB - W-B

A. D. D. shift motor output

Ignition switch ON

Transfer position switch 2WD to H4

(during A.D.D. actuator Free to Lock operation)

Pulse generation

(see waveform 1)

F12-7 (TM2) - F12-10 (GND)

L - W-B

Transfer shift motor output

Ignition switch ON

Shift lever in N*1

Shift lever in neutral*2

Transfer position switch turned from 2WD to H4 (switching from 2WD to H4)

Transfer position switch turned from H4 to L4 (switching from H4 to L4)

Pulse generation

(see waveform 2)

F12-8 (TM1) - F12-10 (GND)

G - W-B

Transfer shift motor output

Ignition switch ON

Shift lever in N*1

Shift lever in neutral*2

Transfer position switch turned from L4 to H4 (switching from L4 to H4)

Pulse generation

F12-10 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

  • *1: for Automatic Transmission
  • *2: for Manual Transmission
  • *3: 2GR-FKS
  • *4: 2TR-FE

(b) Waveform 1

(1) When a gear is engaged and switching is performed

Item

Content

Tester Connection

F12-2 (DM1) - F12-10 (GND)

Tool Setting

5 V/DIV., 100 ms./DIV.

Condition

Ignition switch ON

Transfer position switch H4 to 2WD

(during A.D.D. actuator Lock to Free operation)

Item

Content

Tester Connection

F12-6 (DM2) - F12-10 (GND)

Tool Setting

5 V/DIV., 100 ms./DIV.

Condition

Ignition switch ON

Transfer position switch 2WD to H4

(during A.D.D. actuator Free to Lock operation)

(2) When a gear is not engaged and switching is not performed

Item

Content

Tester Connection

F12-2 (DM1) - F12-10 (GND)

Tool Setting

5 V/DIV., 500 ms./DIV.

Condition

Ignition switch ON

Transfer position switch H4 to 2WD

(during A.D.D. actuator Lock to Free operation)

Item

Content

Tester Connection

F12-6 (DM2) - F12-10 (GND)

Tool Setting

5 V/DIV., 500 ms./DIV.

Condition

Ignition switch ON

Transfer position switch 2WD to H4

(during A.D.D. actuator Free to Lock operation)

(c) Waveform 2

(1) When a gear is engaged and switching is performed

Item

Content

Tester Connection

F12-8 (TM1) - F12-10 (GND)

Tool Setting

5 V/DIV., 100 ms./DIV.

Condition

Ignition switch ON

Shift lever in N*1

Shift lever in neutral*2

Transfer position switch turned from L4 to H4 (switching from L4 to H4)

  • *1: for Automatic Transmission
  • *2: for Manual Transmission

Item

Content

Tester Connection

F12-7 (TM2) - F12-10 (GND)

Tool Setting

5 V/DIV., 100 ms./DIV.

Condition

Ignition switch ON

Shift lever in N*1

Shift lever in neutral*2

Transfer position switch turned from 2WD to H4 (switching from 2WD to H4)

Transfer position switch turned from H4 to L4 (switching from H4 to L4)

  • *1: for Automatic Transmission
  • *2: for Manual Transmission

(2) When a gear is not engaged and switching is not performed

Item

Content

Tester Connection

F12-8 (TM1) - F12-10 (GND)

Tool Setting

5 V/DIV., 1 s./DIV.

Condition

Ignition switch ON

Shift lever in N*1

Shift lever in neutral*2

Transfer position switch turned from L4 to H4 (switching from L4 to H4)

  • *1: for Automatic Transmission
  • *2: for Manual Transmission

Item

Content

Tester Connection

F12-7 (TM2) - F12-10 (GND)

Tool Setting

5 V/DIV., 1 s./DIV.

Condition

Ignition switch ON

Shift lever in N*1

Shift lever in neutral*2

Transfer position switch turned from 2WD to H4 (switching from 2WD to H4)

Transfer position switch turned from H4 to L4 (switching from H4 to L4)

  • *1: for Automatic Transmission
  • *2: for Manual Transmission
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