Diagnosis System

CHECK DLC3

The ECU uses CAN and ISO 9142-2 for communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 9142-2 format.

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

TERMINAL DESCRIPTION CHART

Terminal No. (Symbols)

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

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.

Connect the cable of the intelligent tester to the DLC3, turn the ignition switch to the ON position, and attempt to use the tester. If the display indicates that communication error has occurred, there is a problem with either the vehicle or the tester.
- If communication is normal when the tester is connected to another vehicle, inspect the DLC3 of the original vehicle.
- If communication is still not possible when the tester is connected to another vehicle, the problem may be in the tester itself. Consult the Service Department listed in the tester's instruction information.