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ON-BOARD DIAGNOSTIC SYSTEM OUTLINE

id040200175000
• The on-board diagnostic system consists of a malfunction detection system that detects abnormalities in input/output signals when the ignition switch is at the ON position, a data monitor function that reads out specified input/output signals and a active command modes function that allows for override operation of output parts (such as solenoid valves).
• The data link connector 2 (DLC-2), which groups together all the connectors used for malfunction diagnosis and detecting/repair into a single location, has been adopted, thereby improving serviceability. Diagnosis is performed by connecting the WDS or equivalent to the DLC-2.
• In addition to DTC read-out, the WDS or equivalent is used to clear DTCs using the display screen of the diagnostic tester, and to access the PID/data monitor and active command modes functions, providing enhanced malfunction diagnosis and improved serviceability.

Block diagram

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1 | TCS indicator light (with ABS/TCS) or DSC indicator light (with DSC)
2 | TCS OFF light (with ABS/TCS) or DSC OFF light (with DSC)
3 | ABS warning light
4 | Brake system warning light
5 | On-board diagnostic function
6 | Memory function
7 | Malfunction display function
8 | Serial communication
9 | Malfunction detection function
10 | PID/DATA monitor function
11 | Active command modes function
12 | Fail-safe function
13 | HU inspection function
14 | Input device
15 | Normal control area
16 | Output device
17 | WDS or equivalent