Terminals Of Ecu

WARNING: This page is about a different car, the 2010 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOUR WHEEL DRIVE CONTROL ECU

Fig 1: Identifying Four Wheel Drive Control ECU Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
F47-1 (HL1) - F46-4 (GND)	GR - W-B	High-low transfer shift actuator limit switch	Ignition switch ON Transfer position switch H4F or H4L	10.5 to 14 V
F47-1 (HL1) - F46-4 (GND)	GR - W-B	High-low transfer shift actuator limit switch	Ignition switch ON Transfer position switch L4L	Below 1.5 V
F47-2 (HL2) - F46-4 (GND)	LG - W-B	High-low transfer shift actuator limit switch	Ignition switch ON Transfer position switch H4F or H4L	Below 1.5 V
F47-2 (HL2) - F46-4 (GND)	LG - W-B	High-low transfer shift actuator limit switch	Ignition switch ON Transfer position switch L4L	10.5 to 14 V
F47-6 (TL1) - F46-4 (GND)	W-B - W-B	Transfer operating switch mode selection signal	Always	Below 1 Ω
F47-7 (TL2) - F46-4 (GND)	L - W-B	Multi mode transfer shift actuator limit switch	Ignition switch ON Transfer position switch H4L or L4L	Below 1.5 V
F47-7 (TL2) - F46-4 (GND)	L - W-B	Multi mode transfer shift actuator limit switch	Ignition switch ON Transfer position switch H4F	10.5 to 14 V
F47-8 (TL3) - F46-4 (GND)	R - W-B	Multi mode transfer shift actuator limit switch	Ignition switch ON Transfer position switch H4L or L4L	10.5 to 14 V
F47-8 (TL3) - F46-4 (GND)	R - W-B	Multi mode transfer shift actuator limit switch	Ignition switch ON Transfer position switch H4F	Below 1.5 V
F47-11 (2-4) - F46-4 (GND)	W - W-B	Transfer position switch	Ignition switch ON Transfer position switch H4F or H4L	Below 1.5 V
F47-11 (2-4) - F46-4 (GND)	W - W-B	Transfer position switch	Ignition switch ON Transfer position switch L4L	10.5 to 14 V
F47-13 (LO) - F46-4 (GND)	B - W-B	Transfer position switch	Ignition switch ON Transfer position switch H4F	10.5 to 14 V
F47-13 (LO) - F46-4 (GND)	B - W-B	Transfer position switch	Ignition switch ON Transfer position switch H4L or L4L	Below 1.5 V
F47-14 (P1) - F46-4 (GND)	W - W-B	Multi mode transfer shift actuator Center differential lock position detection switch	Ignition switch ON Transfer position switch H4F	9.5 to 14 V
F47-14 (P1) - F46-4 (GND)	W - W-B		Ignition switch ON Transfer position switch H4L or L4L	Below 1.5 V
F47-19 (CANH) - F46-4 (GND)	G - W-B	CAN communication line	Ignition switch ON	Pulse generation (See waveform 1)
F47-20 (CANL) - F46-4 (GND)	W - W-B	CAN communication line	Ignition switch ON	Pulse generation (See waveform 2)
F47-21 (L4) - F46-4 (GND)	R - W-B	Transfer L4 signal	Ignition switch ON Transfer position switch H4F or H4L	10 to 14 V
F47-21 (L4) - F46-4 (GND)	R - W-B	Transfer L4 signal	Ignition switch ON Transfer position switch L4L	Below 1.5 V
F46-2 (HM1) - F46-4 (GND)	B - W-B	High-low transfer shift actuator motor	Ignition switch ON Transfer position switch H4L → L4L (During operation of high-low transfer shift actuator motor from HIGH to LOW)	10 to 14 V
F46-2 (HM1) - F46-4 (GND)	B - W-B	High-low transfer shift actuator motor	Ignition switch ON Transfer position switch H4L → L4L (High-low transfer shift actuator motor stopped)	Below 1.5 V
F46-3 (IG) - F46-4 (GND)	R - W-B	IG power	Ignition switch ON	11 to 14 V
F46-4 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
F46-6 (HM2) - F46-4 (GND)	W - W-B	High-low transfer shift actuator motor	Ignition switch ON Transfer position switch L4L → H4L (During operation of high-low transfer shift actuator motor from LOW to HIGH)	10 to 14 V
F46-6 (HM2) - F46-4 (GND)	W - W-B	High-low transfer shift actuator motor	Ignition switch ON Transfer position switch L4L → H4L (High-low transfer shift actuator motor stopped)	Below 1.5 V
F46-7 (TM2) - F46-4 (GND)	V - W-B	Multi mode transfer shift actuator motor	Ignition switch ON Transfer position switch H4L → H4F (During operation of multi mode transfer shift actuator motor from LOCK to FREE)	10 to 14 V
F46-7 (TM2) - F46-4 (GND)	V - W-B	Multi mode transfer shift actuator motor	Ignition switch ON Transfer position switch H4L → H4F (Multi mode transfer shift actuator motor stopped)	Below 1.5 V
F46-8 (TM1) - F46-4 (GND)	P - W-B	Multi mode transfer shift actuator motor	Ignition switch ON Transfer position switch H4F → H4L (During operation of multi mode transfer shift actuator motor from FREE to LOCK)	10 to 14 V
F46-8 (TM1) - F46-4 (GND)	P - W-B	Multi mode transfer shift actuator motor	Ignition switch ON Transfer position switch H4F → H4L (Multi mode transfer shift actuator motor stopped)	Below 1.5 V

Using an oscilloscope, check waveform 1.

Fig 2: Identifying Waveform 1

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*1	Waveform 1

WAVEFORM 1 (REFERENCE)

Item	Content
Terminal No. (Symbols)	F47-19 (CANH) - F46-4 (GND)
Tool setting	1 V/DIV., 10 μsec./DIV.
Condition	Engine stopped and ignition switch ON

HINT:

The waveform varies depending on the CAN communication signal.

Using an oscilloscope, check waveform 2.

Fig 3: Identifying Waveform 2

*1	Waveform 2

WAVEFORM 2 (REFERENCE)

Item	Content
Terminal No. (Symbols)	F47-20 (CANL) - F46-4 (GND)
Tool setting	1 V/DIV., 10 μsec./DIV.
Condition	Engine stopped and ignition switch ON

HINT:

The waveform varies depending on the CAN communication signal.