Diagnosis System

Total OBD & ECU Auto Diagnostics

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1. DESCRIPTION

(a) Lighting system data and the Diagnostic Trouble Codes (DTCs) can be read from the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioning, use the intelligent tester to check for malfunctions and perform repairs.

2. CHECK DLC3

(a) The ECU uses ISO 15765-4 for communication. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.

J H100769E16

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 Q

SG (5) - Body ground

Signal ground

Always

Below 1 Q

BAT (16) - Body ground

Battery positive

Always

11 to 14 V

CANH (6) - CANL (14)

CAN bus line

Ignition switch off*

54 to 69 Q

CANH (6) - CG (4)

HIGH-level CAN bus line

Ignition switch off*

200 Q or higher

CANL (14) - CG (4)

LOW-level CAN bus line

Ignition switch off*

200 Q or higher

CANH (6) - BAT (16)

HIGH-level CAN bus line

Ignition switch off*

6 kQ or higher

CANL (14) - BAT (16)

LOW-level CAN bus line

Ignition switch off*

*Before measuring the resistance, leave the vehicle as is for at least Iminute 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.

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