Diagnosis System

CHECK DLC3

The vehicle's combination meter (ECU) uses CAN and the ISO 9141-2 for communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 9141-2 format.

Fig 1: Identifying DLC3 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

DLC3 CONNECTOR TERMINALS REFERENCE

Symbols (Terminals No.)	Terminals Description	Condition	Specified condition
CG(4) - Body ground	Chassis ground	Always	Below 1 Ω
BAT(16) - Body ground	Battery positive	Always	11 to 14 V
CANH(6) - CANL(14)	HIGH-level CAN bus line	IG switch OFF	54 Ω to 67Ω
CANH(6) - Body ground	HIGH-level CAN bus line	IG switch OFF	1 MΩ or higher
CANH(6) - CG(4)	HIGH-level CAN bus line	IG switch OFF	3 KΩ or higher
CANL(14) - Body ground	LOW-level CAN bus line	IG switch OFF	1 MΩ or higher
CANL(14) - CG(4)	LOW-level CAN bus line	IG switch OFF	3 KΩ or higher

HINT:

If the display shows UNABLE TO CONNECT TO VEHICLE when you have connected the cable of the hand-held tester to the DLC3, turned the ignition switch ON and operated the tester, there is a problem on the vehicle side or tool side.

If the communication is normal when the tool is connected to another vehicle, inspect the DLC3 on the original vehicle.
If the communication is still impossible when the tool is connected to another vehicle, the problem is probably in the tool itself, so consult the Service Department listed in the tool's instruction manual.

DIAGNOSIS CHECK (MULTI- INFORMATION DISPLAY)
1. Switch to diagnosis mode
  1. Connect terminal 13 (TC) and 4 (CG) of the DLC3 using SST.
    
    Fig 2: Identifying Terminal 13 (TC) And 4 (CG) Of DLC3
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. The display in the warning area shows "DIAG" when the ignition switch is turned to the ON position.
  3. Each system can be switched by pushing the "DISP1" switch on the steering pad switch.
  HINT:
  
  Diagnosis checks for the EFI, VSC and CRUISE systems can be done by using the displayed items in the warning area.
  - SFI (EFI) system (see SYSTEM DIAGRAM )
  - VSC system (see HOW TO PROCEED WITH TROUBLESHOOTING )
  - CRUISE system (see HOW TO PROCEED WITH TROUBLESHOOTING )
  Fig 3: Display Items In Warning Area
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Read DTCs
  1. "OK" is displayed if the system is normal while "NG" is displayed if it is malfunctioning.
  HINT:
  
  When the ignition switch is turned to any position but ON during diagnosis mode, the mode is canceled.
  
  Fig 4: Display OK And NG
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. "- -" is displayed if there is an open or short circuit in communication lines between the meter and each ECU being checked. "E" is displayed if there is a problem with diagnosis communication signal data.
Fig 5: Display E And - -
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002