Terminals Of Ecu [10/2016 - ]

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CHECK 4WD ECU ASSEMBLY

Fig 1: Identifying 4WD ECU Assembly Connector Terminal Identification

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the voltage and resistance of the connector.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
A58-3 (IG1) - A58-4 (GND)	G - W-B	Power source voltage	Engine switch on (IG)	11 to 14 V
A58-2 (SLC+) - A58-1 (SLC-)	B - R	Transfer control solenoid signal	Shift lever in D, engine idling	Pulse generation (See waveform 1)
A58-4 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
A58-6 (CANH) - A58-5 (CANL)	W - B	HIGH-level CAN bus wire - LOW-level CAN bus wire	Cable disconnected from negative (-) battery terminal	54 to 69 Ω

If the result is not as specified, the 4WD ECU assembly may have a malfunction.

Using an oscilloscope, check the waveform 1.

WAVEFORM 1 (REFERENCE)

Item	Content
Terminal No. (Symbol)	A58-2 (SLC+) - A58-1 (SLC-)
Tester Range	2 V/DIV., 1 msec./DIV.
Condition	Shift lever in D, engine idling

Fig 2: Identifying Waveform 1