Diagnosis System

1. The vehicle's ECU uses ISO 15765-4 for communication protocol. The terminal arrangement of the DLC3 complies with ISO 15031-3 and matches the ISO 15765-4 format.
   Fig 1: Identifying DLC3 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TERMINAL DESCRIPTION REFERENCE CHART
   
   

   Symbols (Terminal No.)	Terminal Description	Condition	Specified Condition
   SIL (7) - SG (5)	Bus "+" tine	During transmission	Pulse generation
   CG (4) - Body ground	Chassis ground	Always	Below 1 Ω
   SG (5) - Body ground	Signal ground	Always	Below 1 Ω
   BAT (16) - Body ground	Battery positive	Always	11 to 14 V
   CANH (6) - CANL (14)	CAN bus line	Ignition switch OFF(1)	54 to 69 Ω
   CANH (6) - CG (4)	HIGH-level CAN bus line	Ignition switch OFF(1)	200 Ω or higher
   CANL (14) - CG (4)	LOW-level CAN bus line	Ignition switch OFF(1)	200 Ω or higher
   CANH (6) - BAT (16)	HIGH-level CAN bus line	Ignition switch OFF(1)	6 kΩ or higher
   CANL (14) - BAT (16)	LOW-level CAN bus line	Ignition switch OFF(1)	6 kΩ or higher
   (1) Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors.

   If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector.

2. Connect the cable of the Techstream to the DLC3, turn the ignition switch to the ON position and attempt to use the Techstream. If the screen displays a communication error message, a problem exists in the vehicle side or tester side.

   HINT:

   • If communication is normal when the tool is connected to another vehicle, inspect the DLC3 on the original vehicle.
   • If communication is still impossible when the tool is connected to another vehicle, the problem is probably in the tool itself. Consult the service department listed in the tool's instruction manual.

Standard voltage: 

11 to 14 V 

If the voltage is below 11V, recharge or replace the battery before proceeding.