2014 - Mazda6 - Brakes

ON-BOARD DIAGNOSTIC SYSTEM [LASER SENSOR]

OUTLINE

• The on-board diagnostic system consists of a malfunction detection system that detects malfunctions in input/output signals when the ignition is switched ON, a PID/data monitor function that reads out specified input/output signals, and an active command mode 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 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 and active command modes functions, providing enhanced malfunction diagnosis and improved serviceability.

Block diagram

FUNCTION

Malfunction detection function

• The malfunction detection function detects and displays malfunctions in the input/output signal system of the laser sensor when the ignition is switched ON.

• If the laser sensor malfunction is detected, the master warning light is illuminated and the message “SCBS Inspection Required” is indicated in the TFT LCD display. DTCs can be output through the CAN_H and CAN_L of the DLC-2 using the external tester communication function. At the same time, malfunction detection results are sent to the memory and fail-safe functions.

Memory function

• 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 has been switched off, even if the malfunctioning signal system has returned to normal.

• Since the laser sensor 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.

DTC 7-digit code definition

• When related systems or components have failed, the sensor stores the DTC of the malfunctioning part in the sensor memory, and allows for the retrieval of the stored data using the scanning tool when necessary. The DTCs are indicated using seven digits. Each digit indicates the following.

  

Fail-safe function

• When the malfunction detection function determines a malfunction, the master warning light illuminates and the message “SCBS Inspection Required” is indicated in the TFT LCD display to alert the driver. At this time, the Smart City Brake Support (SCBS) is inhibited.

*¹

C: CMDTC self-test

Status byte for DTC

• The status byte is the two-digit code (two digits after hyphen (-)) after the DTC.

  

• The status byte is a code which indicates the pending code, current/past malfunction status, or warning illumination status.

• The status byte can be read by performing a CMDTC self test using the Mazda Modular Diagnostic System (M-MDS).

• For details on the status byte, refer to the explanation on the Mazda Modular Diagnostic System (M-MDS) when reading the DTC.

Snapshot data

• The snapshot data stores the currently detected DTC data

PID/data monitor function

• The PID/data monitor function is used for optionally selecting input/output signal monitor items preset in the laser sensor and reading them out in real-time.

External tester communication function

• The external tester communication function enables communication of diagnostic data (DTC read-outs, input/output signal read-outs, operation of input/output parts) between the laser sensor and an external tester.

Serial communication

• Serial communication (two-way communication) allows for multiple data to be sent and received instantly along the same line.

• By connecting the Mazda Modular Diagnostic System (M-MDS) to the DLC-2, diagnostic data can be sent and received between the Mazda Modular Diagnostic System (M-MDS) and the laser sensor using the CAN_H and CAN_L terminals (within the DLC-2).

• The laser sensor receives the command signals of the malfunction detection function and PID/data monitor function based on the Mazda Modular Diagnostic System (M-MDS), and sends DTCs and data regarding the operating condition and status of each input/output part to the Mazda Modular Diagnostic System (M-MDS).