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ON-BOARD DIAGNOSTIC SYSTEM OUTLINE (ELECTRIC POWER STEERING)

BHE060201038T01

• 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 simulation function that allows for override operation of output parts and is used to set the system to the neutral position.

• The Data Link Connector 2 (DLC-2), which groups together all the connectors used for malfunction diagnosis 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 data monitor and simulation functions, providing enhanced malfunction diagnosis and improved serviceability.

## Block Diagram

1 | EPS control module
2 | On-board diagnostic function
3 | Memory function
4 | Malfunction indication function
5 | External tester communication function
6 | CAN driver
7 | EPS warning light
8 | DLC-2
9 | WDS or equivalent
10 | Other unit (PCM)
11 | Malfunction detection function
12 | PID/data monitor function
13 | Active command function
14 | Fail-safe function
15 | Input parts
16 | EPS normal control area
17 | Output parts