Toyota 4Runner: Terminals Of Ecu

Toyota 4Runner Service Manual / Drivetrain / Axle And Differential / Differential 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
F47-6 (RLY1) - F46-4 (GND)	G - W-B	Rear differential lock actuator limit switch	Ignition switch ON Rear differential lock actuator limit switch on	Below 1.5 V
F47-6 (RLY1) - F46-4 (GND)	G - W-B	Rear differential lock actuator limit switch	Ignition switch ON Rear differential lock actuator limit switch off	11 to 14 V
F47-7 (RLY2) - F46-4 (GND)	P - W-B	Rear differential lock actuator limit switch	Ignition switch ON Rear differential lock actuator limit switch on	Below 1.5 V
F47-7 (RLY2) - F46-4 (GND)	P - W-B	Rear differential lock actuator limit switch	Ignition switch ON Rear differential lock actuator limit switch off	11 to 14 V
F47-11 (R) - F46-4 (GND)	SB - W-B	Rear differential lock switch	Ignition switch ON Rear differential lock switch on	Below 1.5 V
F47-11 (R) - F46-4 (GND)	SB - W-B	Rear differential lock switch	Ignition switch ON Rear differential lock switch off	11 to 14 V
F47-14 (RLP) - F46-4 (GND)	V - W-B	Rear differential lock detection switch	Ignition switch ON Rear differential lock detection switch on	Below 1.5 V
F47-14 (RLP) - F46-4 (GND)	V - W-B	Rear differential lock detection switch	Ignition switch ON Rear differential lock detection switch off	9.5 to 14 V
F46-8 (M1) - F46-4 (GND)	LG - W-B	Differential lock actuator motor	Ignition switch ON Differential lock switch off → on (Differential lock switch OFF → ON (For 5 seconds after power supplied or until switching of limit switch is complete during FREE to LOCK switching))	11 to 14 V
F46-8 (M1) - F46-4 (GND)	LG - W-B	Differential lock actuator motor	Ignition switch ON Differential lock switch off → on (Differential lock 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
F46-7 (M2) - F46-4 (GND)	L - W-B	Differential lock actuator motor	Ignition switch ON Differential lock switch on → off (Differential lock switch ON → OFF (For 5 seconds after power supplied or until switching of limit switch is complete during LOCK to FREE switching))	11 to 14 V
F46-7 (M2) - F46-4 (GND)	L - W-B	Differential lock actuator motor	Ignition switch ON Differential lock switch on → off (Differential lock actuator motor stopped)	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)

(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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