Diagnosis System

CHECK DLC3

The vehicle's ECU uses ISO 15765-4 for communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.

Fig 1: Identifying DLC3 Connector Terminals (CANL And BAT)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

ECU CONNECTOR TERMINAL DESCRIPTION CHART

Symbols (Terminal No.)

Terminal Description

Condition

Specified Condition

SIL (7) - SG (5)

Bus "+" line

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

10 to 14 V

CANH (6) - CANL (14)

CAN bus line

Engine switch OFF⁽¹⁾

54 to 69 a

CANH (6) - CG (4)

HIGH-level CAN bus line

Engine switch OFF⁽¹⁾

200 Ω or higher

CANL (14) - CG (4)

LOW-level CAN bus line

Engine switch OFF⁽¹⁾

200 Ω or higher

CANH (6) - BAT (16)

HIGH-level CAN bus line

Engine switch OFF⁽¹⁾

6 Ω or higher

CANL (14) - BAT (16)

LOW-level CAN bus line

Engine switch OFF⁽¹⁾

6 Ω or higher

⁽¹⁾	Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the engine 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.

Connect the cable of the Techstream (with CAN VIM) to the DLC3, turn the engine switch on (IG) and attempt to use the Techstream. If the screen displays a communication error message, a problem exists on 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.