Diagnosis System

MULTIPLEX COMMUNICATION: MULTIPLEX COMMUNICATION SYSTEM: DIAGNOSIS SYSTEM

1. DESCRIPTION

(a) Multiplex communication system data can be read in the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioning, use Techstream to check for malfunctions and make necessary repairs.

2. INSPECT BATTERY VOLTAGE

Standard:

11 to 14 V

If the voltage is below 11 V, recharge or replace the battery before proceeding.

3. CHECK DLC3

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









NOTICE:
*Before measuring the resistance, leave the vehicle as it is for at least 1 minute and do not operate the ignition switch, or any other switches or the doors.

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

HINT
* If communication is normal when the tester is connected to another vehicle, inspect 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 instruction manual.