ON-BOARD DIAGNOSTIC SYSTEM [LASER SENSOR]

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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

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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 Smart Brake Support/Smart City Brake Support (SBS/SCBS) indicator light (amber) is illuminated. 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.
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Fail-safe function

•  When the malfunction detection function determines a malfunction, the Smart Brake Support/Smart City Brake Support (SBS/SCBS) indicator light (amber) illuminates to alert the driver. At this time, the Smart City Brake Support (SCBS) is inhibited.
Note
•  A warning message in the center display is displayed with the Smart Brake Support/Smart City Brake Support (SBS/SCBS) indicator light (amber) turned on or flashed. For the message content and verification method, refer to the CENTER DISPLAY.

DTC table

×: Applicable
-: Not applicable

DTC No.

Smart City Brake Support (SCBS) indicator light (amber)

Fail-safe function

Malfunction location

Drive cycle

Self test type*1

Memory function
U0001:00
Illuminated
Smart City Brake Support (SCBS) control disabled
CAN line
-
C
×
U0100:00
U0121:00
U0131:00
U0155:00
U0401:68
Illuminated
Smart City Brake Support (SCBS) control disabled
Abnormal message from PCM
-
C
×
U0415:68
Illuminated
Smart City Brake Support (SCBS) control disabled
Abnormal message from DSC HU/CM
-
C
×
U0420:68
Illuminated
Smart City Brake Support (SCBS) control disabled
Abnormal message from EPS CM
-
C
×
U0423:68
Illuminated
Smart City Brake Support (SCBS) control disabled
Abnormal message from instrument cluster
-
C
×
U1A14:49
Illuminated
Smart City Brake Support (SCBS) control disabled
Laser sensor
-
C
×
U2300:55
Illuminated
Smart City Brake Support (SCBS) control disabled
Configuration data not recorded or data error
-
C
×
U2300:56
Smart City Brake Support (SCBS) control disabled
-
C
×
U3000:00
Illuminated
Smart City Brake Support (SCBS) control disabled
Laser sensor (internal malfunction)
-
C
×
U3000:64
Smart City Brake Support (SCBS) control disabled
-
C
×
U3000:66
Illuminated
Smart City Brake Support (SCBS) control disabled
Laser sensor
-
C
×

*1  :C: CMDTC self-test


Status byte for DTC

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

Snapshot data item

Unit

Definition

Corresponding data monitor items
DSC_R_BRK
OK/Error
DSC response against brake request from SCBS module
—
DSC_R_BRK_C
OK/Error
DSC response against brake assist threshold change from SCBS module
—
DSC_R_NOREQ
OK/Error
DSC response while no request from SCBS module
—
DSC_R_PRECH
OK/Error
DSC response against pre-charge request from SCBS module
—
DSC_SYSTEM
OK/Error
DSC system condition
—
ECU_IN_TEMP
°C
ECU internal temperature
—
PCM_R_NOREQ
OK/Error
PCM response while no request from SCBS module
—
PCM_R_REQ
OK/Error
PCM response against request from SCBS module
—
PCM_SYSTEM
OK/Error
PCM system condition
—
TOTAL_DIST
km, ft, mi
Total distance
—
TOTAL_TIME
hh:mm:ss
Total time
—
VPWR
V
Power supply
—
VSPD
KPH, MPH
Vehicle speed
—


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.

PID/data monitor table

Mazda Modular Diagnostic System (M-MDS) display

Data contents

Unit/Operation (Mazda Modular Diagnostic System (M-MDS) display)
DIST_BMP_TGT
Distance from bumper to target that sensor has detected
m
VPWR_IG1
Module supply voltage (IG1)
V
VSPD
Vehicle speed
KPH, MPH


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.

Connections/communication contents

External tester

Mazda Modular Diagnostic System (M-MDS)

Connection

Communication method
On-board diagnostic (malfunction detection) function
Input/output: CAN_H (HS), CAN_L (HS) terminals
Serial communication
PID/data monitor function
Input/output: CAN_H (HS), CAN_L (HS) terminals
Serial communication

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).

Diagnostic function name

Signal received

Signal sent
Malfunction detection function
DTC verification signal
DTC
PID/data monitor function
Command signal to read selected monitor item
Monitored data for requested monitor item