Diagnosis System

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

CHECK DLC3

If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector.

Fig 1: Identifying DL3C Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Condition	Specified Condition
7 (Bus "+" line) - 5 (Signal ground)	During transmission	Pulse generation
4 (Chassis ground) - Body ground	Always	Below 1
5 (Signal ground) - Body ground	Always	Below 1
16 (B+) - Body ground	Always	9 to 14 V

HINT:

If the display shows UNABLE TO CONNECT TO VEHICLE when you have connected the cable of the intelligent tester to the DLC3, turned the ignition switch to the ON position and operated the tester, a problem exists in either the vehicle or tester.

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