Terminals Of Ecu

HINT:

Inspect the connector from the back side while connector is connected.

1. 4WD CONTROL ECU: 
   Fig 1: Identifying 4WD Control ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TERMINAL DESCRIPTION SPECIFIED CONDITION CHART
   
   

   Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
   CANH (A48-1) - CANL (A48-14)	B-W	CAN communication line	Engine switch off	54 to 67 Ω
   RRO (A48-2) - GND (A48-30)	P-W-B	Rear right wheel speed sensor signal	Engine switch on (IG), driving at approximately 18mph(30km/h)	Pulse generation (see  awaveform 1)
   FRO (A48-3) - GND (A48-30)	G-W - W-B	Front right wheel speed sensor signal	Engine switch on (IG), driving at approximately 18mph (30km/h)	Pulse generation (see  awaveform 1)
   IG1 (A48-9) - GND (A48-30)	B - W-B	Power source voltage	Engine switch on (IG)	10 to 14 V
   SLC+ (A48-13) - SLC- (A48-32)	P-L - G-R	Transfer control solenoid signal	Engine switch on (IG)	Pulse generation (see  bwaveform 2)
   RLO (A48-15) - GND (A48-30)	L - W-B	Rear left wheel speed sensor signal	Engine switch on (IG), driving at approximately 18mph (30km/h)	Pulse generation (see  awaveform 1)
   FLO (A48-16) - GND (A48-30)	R-L - W-B	Front left wheel speed sensor signal	Engine switch on (IG), driving at approximately 18mph (30km/h)	Pulse generation (see  awaveform 1)
   FREE (A48-23) -GND (A48-30)	GR - W-B	Sets the center differential free	Engine switch on (IG), open and short terminals OPA and CG of the DLC3.	10 to 14 → 0 to 1.5 V
   GND (A48-30) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

   1. Waveform 1 (Reference):
      WAVEFORM REFERENCE
      
      

      Item	Contents
      Tool setting	2 V/DIV, 2 ms/DIV
      Vehicle condition	Driving at approximately 18 mph (30 km/h)

      HINT:

      As vehicle speed (wheel rotation speed) increases, the width of the waveform narrows.

      Fig 2: Identifying Waveform 1

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Waveform 2 (Reference):
      WAVEFORM REFERENCE
      
      

      Item	Contents
      Tool setting	5 V/DIV, 2 ms/DIV
      Vehicle condition	Engine stop, Engine switch on (IG)

   Fig 3: Identifying Waveform 2

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002