Diagnosis System

WARNING: This page is about a different car, the 2007 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.

DESCRIPTION
1. Data of the system can be read through the Data Link Connector 3 (DLC3) of the vehicle.
  Therefore, when the system seems to be malfunctioning, use the intelligent tester to check for a malfunction and repair it.

CHECK DLC3

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

HINT:

Connect the cable of the intelligent tester to the DLC3, turn the ignition switch ON and attempt to use the tester. If the display indicates that a communication error has occurred, there is a problem either with the vehicle or with the tester.

If communication is normal when the tester is connected to another vehicle, inspect the DLC3 of the original vehicle.

Fig 1: Identifying DLC3 Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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 manual.

Fig 2: Connecting Intelligent Tester To DLC3

DLC3 TERMINALS VOLTAGE AND RESISTANCE SPECIFICATION

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	11 to 14 V
CANH (6) - CANL (14) HIGH-level	CAN bus line	Ignition switch OFF	54 to 69 Ω
CANH (6) - Battery positive HIGH-level	CAN bus line	Ignition switch OFF	1 MΩ or higher
CANH (6) - CG (4) HIGH-level	CAN bus line	Ignition switch OFF	1 kΩ or higher
CANL (14) - Battery positive LOW-level	CAN bus line	Ignition switch OFF	1 MΩ or higher
CANL (14) - CG (4) LOW-level	CAN bus line	Ignition switch OFF	1 kΩ or higher