ON-BOARD DIAGNOSTIC

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2014 - Mazda6 - Multiplex Communication System

ON-BOARD DIAGNOSTIC

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
	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
	U0151:00	Communication error with SAS control module
	U0155:00	Communication error with instrument cluster
	U0214:00	Communication error with start stop unit
	U023A:00	Communication error with forward sensing camera
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
	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
	U0235:68	Communication error with laser sensor
	U023A:00	Communication error with forward sensing camera
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
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
SAS control module (RCM)	U0001:88	Unit communication error
SAS control module (RCM)	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 mazda radar cruise control (MRCC)
*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 BSM control module
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
	U0193:00	Communication error with SIRIUS satellite radio unit
Climate control unit (EATC)	U0010:88	Unit communication error
Climate control unit (EATC)	U0155:00	Communication error with instrument cluster
BSM control module (LH)^*2 (BSML)	U0001:88	Unit communication error
	U0100:00	Communication error with PCM
	U0131:00	Communication error with EPS control module
	U0155:00	Communication error with instrument cluster
	U0214:00	Communication error with start stop unit
Rear body control module (RBCM) (R_BCM)	U0010:88	Unit communication error
Rear body control module (RBCM) (R_BCM)	U0155:00	Communication error with instrument cluster

*1: With Bluetooth system
*2: With 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

×


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	×

2. The wiring harness between the DSC HU/CM and connector C-32, or the DSC HU/CM itself could have a malfunction because the DTCs indicating a communication error between the following units, in addition to "Fail" on the DSC HU/CM, are displayed even though communication between the PCM and instrument cluster is normal.

Between DSC HU/CM and PCM

Between DSC HU/CM and TCM

Between DSC HU/CM and front body control module (FBCM)

Between DSC HU/CM and vehicle control-module (V/C-module)

Between DSC HU/CM and laser sensor

Between DSC HU/CM and forward sensing camera

Between DSC HU/CM and EPS control module

Between DSC HU/CM and start stop unit

Between DSC HU/CM and instrument cluster

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