Toyota 4Runner: Terminals Of Ecu

Toyota 4Runner Service Manual / Drivetrain / Vf2a Transfer / 4wd / Awd / Transfer System / Terminals Of Ecu

TERMINALS OF ECU

1. CHECK 4WD CONTROL ECU

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
F47-2 (4WDL) - F46-4 (GND)	L - W-B	Transfer indicator switch (L4 position)	Ignition switch ON Transfer shift lever position H2 or H4	10.5 to 14 V
F47-2 (4WDL) - F46-4 (GND)	L - W-B	Transfer indicator switch (L4 position)	Ignition switch ON Transfer shift lever position L4 or N	Below 1.5 V
F47-3 (4WD) - F46-4 (GND)	B - W-B	Transfer indicator switch (4WD position)	Ignition switch ON Transfer shift lever position H2	10.5 to 14 V
F47-3 (4WD) - F46-4 (GND)	B - W-B	Transfer indicator switch (4WD position)	Ignition switch ON Transfer shift lever position H4, L4 or N	Below 1.5 V
F47-9 (DL1) - F46-4 (GND)	LG - W-B	A.D.D. actuator limit switch	Ignition switch ON Transfer shift lever position H2	Below 1.5 V
F47-9 (DL1) - F46-4 (GND)	LG - W-B	A.D.D. actuator limit switch	Ignition switch ON Transfer shift lever position H4, L4 or N	10.5 to 14 V
F47-10 (DL2) - F46-4 (GND)	GR - W-B	A.D.D. actuator limit switch	Ignition switch ON Transfer shift lever position H2	10.5 to 14 V
F47-10 (DL2) - F46-4 (GND)	GR - W-B	A.D.D. actuator limit switch	Ignition switch ON Transfer shift lever position H4, L4 or N	Below 1.5 V
F47-15 (ADD) - F46-4 (GND)	W - W-B	A.D.D. detection switch	Ignition switch ON Transfer shift lever position H2	9.5 to 14 V
F47-15 (ADD) - F46-4 (GND)	W - W-B	A.D.D. detection switch	Ignition switch ON Transfer shift lever position H4, L4 or N	Below 1.5 V
F47-16 (NP) - F46-4 (GND)	R - W-B	Transfer indicator switch (Neutral position)	Ignition switch ON Transfer shift lever position N	Below 1.5 V
F47-16 (NP) - F46-4 (GND)	R - W-B	Transfer indicator switch (Neutral position)	Ignition switch ON Transfer shift lever position not N	10.5 to 14 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 shift lever position H2 or H4	10 to 14 V
F47-21 (L4) - F46-4 (GND)	R - W-B	Transfer L4 signal	Ignition switch ON Transfer shift lever position L4 or N	Below 1.5 V
F46-1 (DM1) - F46-4 (GND)	B - W-B	A.D.D. actuator motor	Ignition switch ON Transfer shift lever position H2 → H4, L4 or N (During operation of A.D.D. actuator motor from FREE to LOCK)	10 to 14 V
F46-1 (DM1) - F46-4 (GND)	B - W-B	A.D.D. actuator motor	Ignition switch ON Transfer shift lever position H2 → H4, L4 or N (A.D.D. 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
F46-5 (DM2) - F46-4 (GND)	Y - W-B	A.D.D. actuator motor	Ignition switch ON Transfer shift lever position H4, L4 or N → H2 (During operation of A.D.D. actuator motor from LOCK to FREE)	10 to 14 V
F46-5 (DM2) - F46-4 (GND)	Y - W-B	A.D.D. actuator motor	Ignition switch ON Transfer shift lever position H4, L4 or N → H2 (A.D.D. actuator motor stopped)	Below 1.5 V

(b) Using an oscilloscope, check 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

Text in Illustration

*1	Waveform 1

HINT:

The waveform varies depending on the CAN communication signal.

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

Text in Illustration

*1	Waveform 2

HINT:

The waveform varies depending on the CAN communication signal.

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