ON-BOARD DIAGNOSTIC SYSTEM OUTLINE[ELECTRO HYDRAULIC POWER ASSIST STEERING (EHPAS)]

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•  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 and a PID/data monitor function that reads out specified input/output signals.
•  The Data Link Connector 2 (DLC-2), which groups together all the connectors used for malfunction diagnosis into a single place, has been adopted, thereby improving serviceability. Diagnosis is performed by connecting the Mazda Modular Diagnostic System (M-MDS) to the DLC-2.
•  In addition to DTC read-out, the Mazda Modular Diagnostic System (M-MDS) is used to clear DTCs using the display screen of the diagnostic tester, and to access the PID/data monitor, providing enhanced malfunction diagnosis and improved serviceability.

Block Diagram

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1
EHPAS control module
2
On-board diagnostic function
3
Memory function
4
Malfunction Display Function
5
External tester communication function
6
CAN driver
7
EHPAS warning light
8
Mazda Modular Diagnostic System (M-MDS)
9
Other modules
10
Malfunction detection function
11
PID/DATA monitor function
12
Fail-safe function
13
Input device
14
Normal control area
15
Output device