ON-BOARD DIAGNOSTIC

id100200001500


Features

•  The CAN system-related modules have an on-board diagnostic function. The on-board diagnostic function consists of the following functions: A malfunction detection function, which detects malfunctions in the CAN system-related parts; a memory function, which stores detected DTCs; a display function, which indicates malfunctioning areas and status via DTC display.

On-board diagnostic function


Malfunction detection function

•  Detects errors in the input and output signals.
•  If a malfunction is detected, a DTC is output to the DLC-2 through the malfunction indication function. At the same time, malfunction detection results are sent to the memory function.


Memory function

•  The memory function stores malfunctions in input/output signal systems. With this function, malfunction data is not cleared after the ignition is switched off (LOCK), even if the malfunctioning signal system has returned to normal.
•  The stored malfunction information can be cleared by connecting the Mazda Modular Diagnostic System (M-MDS) to the DLC-2 following the Workshop Manual procedure for clearing codes.


Display Function

•  This function is for outputting present or past malfunctions via the DLC-2 as DTCs.
•  To read DTCs output to the DLC-2, use the Mazda Modular Diagnostic System (M-MDS).

DTC table (HS-CAN)

DTC output module (M-MDS display)

DTC

Malfunction location
PCM
(PCM)
U0073:00
Unit communication error
U0101:00
Communication error with TCM
U0104:00
Communication error with vehicle control module (V/C-module)
U0121:00
Communication error with DSC HU/CM
U0131:00
Communication error with EPS control module
U0140:00
Communication error with front body control module (FBCM)
U0151:00
Communication error with SAS control module
U0155:00
Communication error with instrument cluster
U0214:00
Communication error with start stop unit
U0235:00
Communication error with laser sensor
U0298:00
Communication error with DC-DC converter (i-ELOOP)
DSC HU/CM
(ABS)
U0001:88
Unit communication error
U0100:00
Communication error with PCM
U0101:00
Communication error with TCM
U0104:00
Communication error with vehicle control module (V/C-module)
U0131:00
Communication error with EPS control module
U0154:00
Communication error with SAS control module
U0155:00
Communication error with instrument cluster
U0214:00
Communication error with start stop unit
U0235:00
Communication error with laser sensor
TCM*1
(TCM)
U0073:00
Unit communication error
U0100:00
Communication error with PCM
U0121:00
Communication error with DSC HU/CM
U0131:00
Communication error with EPS control module
U0141:00
Communication error with front body control module (FBCM)
U0155:00
Communication error with instrument cluster
Front body control module (FBCM)
(F_BCM)
U0001:88
Unit communication error
U0100:00
Communication error with PCM
U0101:00
Communication error with TCM
U0121:00
Communication error with DSC HU/CM
U0155:00
Communication error with instrument cluster
U0214:00
Communication error with start stop unit
U023A:00
Communication error with forward sensing camera
U0515:00
Communication error with SAS control module
AFS control module*2
(AFS)
U0001:88
Unit communication error
U0100:00
Communication error with PCM
U0131:00
Communication error with EPS control module
U0140:00
Communication error with front body control module (FBCM)
U0155:00
Communication error with instrument cluster
Vehicle control module (V/C-module)*3
(SBS/MRCC)
U0001:88
Unit communication error
U0100:00
Communication error with PCM
U0101:00
Communication error with TCM
U0121:00
Communication error with DSC HU/CM
U0140:00
Communication error with front body control module (FBCM)
U0214:00
Communication error with start stop unit
U0151:00
Communication error with SAS control module
U0155:00
Communication error with instrument cluster
U0131:00
Communication error with EPS control module
U023A:00
Communication error with forward sensing camera
U0285:68
Communication error with laser sensor
DC-DC converter (i-ELOOP)*4
(DCDC)
U0001:88
Unit communication error
U0100:00
Communication error with PCM
U0155:00
Communication error with instrument cluster
Position memory control module*5
(DSM)
U0100:00
Communication error with PCM
U0101:00
Communication error with TCM
U0151:00
Communication error with SAS control module
U0155:00
Communication error with instrument cluster
U0214:00
Communication error with start stop unit
Laser sensor*6
(SCBS)
U0001:00
Unit communication error
U0100:00
Communication error with PCM
U0121:00
Communication error with DSC HU/CM
U0131:00
Communication error with EPS control module
U0155:00
Communication error with instrument cluster
Forward sensing camera*7
(FSC)
U0001:88
Unit communication error
U0100:00
Communication error with PCM
U0121:00
Communication error with DSC HU/CM
U0131:00
Communication error with EPS control module
U0140:00
Communication error with front body control module (FBCM)
U0155:00
Communication error with instrument cluster
U0214:00
Communication error with start stop unit
EPS control module
(EPS)
U0001:88
Unit communication error
U0100:00
Communication error with PCM
U0121:00
Communication error with DSC HU/CM
U0155:00
Communication error with instrument cluster
SAS control module
(RCM)
U0001:88
Unit communication error
U0155:00
Communication error with instrument cluster
Start stop unit
(SSU)
U0001:88
Unit communication error
U0100:00
Communication error with PCM
U0101:00
Communication error with TCM
U0121:00
Communication error with DSC HU/CM
U0121:87
Communication error with DSC HU/CM
U0131:00
Communication error with EPS control module
U0140:00
Communication error with front body control module (FBCM)
U0146:00
Communication error with instrument cluster
U0151:00
Communication error with SAS control module
U0155:00
Communication error with instrument cluster
Audio amplifier*8
(AM)
U0001:88
Unit communication error
Instrument cluster
(IC)
U0001:88
Unit communication error
U0100:00
Communication error with PCM
U0101:00
Communication error with TCM
U0104:00
Communication error with vehicle control module (V/C-module)
U0121:00
Communication error with DSC HU/CM
U0131:00
Communication error with EPS control module
U0140:00
Communication error with front body control module (FBCM)
U0151:00
Communication error with SAS control module
U0182:00
Communication error with AFS control module
U0214:00
Communication error with start stop unit
U0235:00
Communication error with laser sensor
U023A:00
Communication error with forward sensing camera

*1  :ATX vehicles
*2  :With AFS system
*3  :With smart brake support
*4  :With i-ELOOP system
*5  :With power seat
*6  :With smart city brake support
*7  :With forward sensing camera
*8  :With Bose®

DTC table (MS-CAN)

DTC output module (M-MDS display)

DTC

Malfunction location
Instrument cluster
(IC)
U0010:88
Unit communication error
U0142:00
Communication error with rear body control module (RBCM)
U0232:00
Communication error with rear vehicle monitoring control module (LH)
Climate control unit
(EATC)
U0010:88
Unit communication error
U0155:00
Communication error with instrument cluster
Audio unit*1
(ACU)
U0010:88
(16:Er12)
Unit communication error
U0142:00
Communication error with rear body control module (RBCM)
U0155:00
Communication error with instrument cluster
Rear vehicle monitoring control module (LH)*2
(RVM)
U0010:88
Unit communication error
U0100:00
Communication error with PCM
U0121:00
Communication error with DSC HU/CM
U0155:00
Communication error with instrument cluster
U0214:00
Communication error with start stop unit
BSM control module (LH)*3
(BSML)
U0001:88
Unit communication error
U0100
Communication error with PCM
U0131
Communication error with EPS control module
U0155
Communication error with instrument cluster
U0214
Communication error with start stop unit
Rear body control module (RBCM)
(R_BCM)
U0010:88
Unit communication error
U0155:00
Communication error with instrument cluster

*1  :With Bluetooth system
*2  :With rear vehicle monitoring system
*3  :With Blind spot monitoring (BSM) system


Malfunction diagnosis procedure

•  After the vehicle is brought in, verify the repair order form and the malfunctioning symptom, and if a CAN malfunction is considered to be the cause, perform CAN malfunction diagnosis to determine if the malfunction is in the CAN system or not.
•  For CAN malfunction diagnosis, the voltage at the CAN connection terminal on the DLC-2 is measured, and based on the measured value, the CAN circuit can be examined or the malfunction symptom can be determined.
•  If the malfunction symptom is not an open circuit, inspect the voltage or continuity at the CAN circuit and determine the malfunctioning part.
•  If the malfunction symptom is an open circuit, determine the area of the open circuit by using the displayed communication error DTC and the module in which communication has failed.

Example: determining open circuit location

1.  Verify the CAN system-related module DTCs and the failed module using the Mazda Modular Diagnostic System (M-MDS).

DTC output module

Mazda Modular Diagnostic System (M-MDS) display

Displayed DTC

System malfunction location
PCM
PCM
U0121:00
Communication error with DSC HU/CM
TCM
TCM
U0121:00
Communication error with DSC HU/CM
Front body control module (FBCM)
F_BCM
U0121:00
Communication error with DSC HU/CM
Vehicle control module (V/C-module)
SBS/MRCC
U0121:00
Communication error with DSC HU/CM
Laser sensor
SCBS
U0121:00
Communication error with DSC HU/CM
Forward sensing camera
FSC
U0121:00
Communication error with DSC HU/CM
EPS control module
EPS
U0121:00
Communication error with DSC HU/CM
Start stop unit
SSU
U0121:00
Communication error with DSC HU/CM
Instrument cluster
IC
U0121:00
Communication error with DSC HU/CM

Module

Fail
DSC HU/CM
×

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2.  Despite normal communication between the PCM and instrument cluster, a communication error DTC is displayed for the signal between the DSC HU/CM and PCM / TCM / front body control module (FBCM) / vehicle control module (V/C-module) / laser sensor / forward sensing camera / EPS control module / start stop unit / instrument cluster. In addition, the wiring harness between the DSC HU/CM and connector C-32 is considered to be malfunctioning because “Fail” is displayed for the DSC HU/CM.