Mazda 5 Technical Guide Steering

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

  1. 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.
  2. 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 WDS or equivalent to the DLC-2.
  3. 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, providing enhanced malfunction diagnosis and improved serviceability.

Malfunction Detection Function

  1. The malfunction detection function detects malfunctions in the input/output signal system of the EHPAS control module (built into the electric power steering oil pump) when the ignition switch is at the ON position or driving the vehicle.
  2. The EHPAS warning light illuminates according to the following figure when the ignition switch is turned to the ON position to inspect for open circuits in the light.

Malfunction Display Function

  1. When the malfunction detection function detects a malfunction, the EHPAS warning light illuminates to advise the driver. Using the external tester communication function, DTCs can be output to the DLC-2 via the CAN line. At the same time, malfunction detection results are sent to the memory and fail-safe functions.

Memory Function

  1. The memory function stores DTCs of malfunctions in input/output signal systems. With this function, once a DTC is stored it is not cleared after the ignition switch has been turned off (LOCK position), even if the malfunctioning signal system has returned to normal.
  2. Since the EHPAS control module has a built-in non-volatile memory, DTCs are not cleared even if the battery is removed. Therefore, it is necessary to clear the memory after performing repairs. Refer to the Workshop Manual for the DTC clearing procedure.

Fail-safe Function
When the malfunction detection function determines a malfunction, the EHPAS warning light illuminates to advise the driver. At this time, the fail-safe function disables system control or gradually reduces the assist power.

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