ON-BOARD DIAGNOSTIC SYSTEM EXTERNAL DIAGNOSTIC UNIT COMMUNICATION FUNCTION [L8, LF]

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Outline

• Function for allowing both the PCM and external tester to receive and send data.
• The DLC-2 has been adopted as the communication medium.

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Function

• The types of data which the PCM and external tester can receive and send using the external tester communication function include the following items:

  ― Recording of engine control system information in the PCM.
  ― Data related to exhaust emission such as input/output signals, the PCM-calculated values and system status.

DLC-2 Outline

  • The DLC-2 located in the driver compartment is a service connector defined by EOBD regulations.
  • The following are functions for each terminal.

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Terminal | Function
--- | ---
B+ | Battery positive voltage
CAN-L | Serial communication Lo terminal
CAN-H | Serial communication Hi terminal
GND1 | Ground (chassis)
GND2 | Ground (signal)