Terminals Of Ecu [10/2014 - ]

WARNING: This page is about a different variant/trim than selected.

CHECK 4WD ECU ASSEMBLY

Fig 1: 4WD ECU Assembly Connector End View

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the voltage and resistance of the connector.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
I55-10 (4WDS) - I55-4 (GND)	R - W-B	AWD lock mode switch signal	Engine switch on (IG) AWD lock mode switch released → pressed and held	11 to 14 V → Below 1 V
I55-6 (CANH) - I55-5 (CANL)	GR - W	HIGH-level CAN bus wire - LOW-level CAN bus wire	Cable disconnected from negative (-) battery terminal	54 to 69 Ω
I55-4 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
I55-3 (IG1) - I55-4 (GND)	B - W-B	Power source voltage	Engine switch on (IG)	11 to 14 V
I55-2 (SLC+) - I55-1 (SLC-)	W - B	4WD linear solenoid signal	Shift lever in D, engine idling	Pulse generation (See waveform 1)

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)	I55-2 (SLC+) - I55-1 (SLC-)
Tester Range	2 V/DIV., 1 msec./DIV.
Condition	Shift lever in D, engine idling

Fig 2: Identifying Waveform 1