ON-BOARD DIAGNOSTIC FUNCTION [CAN (CONTROLLER AREA NETWORK)]

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On-Board Diagnostic Function


Malfunction detection function

•  The failure detection function in each CAN system-related module detects malfunctions in input/output signals.
•  This function outputs the DTC for the detected malfunction to the DLC-2, and also sends the detected result to the memory function and fail-safe function.


Fail-safe function

•  When the failure detection function determines that there is a malfunction, the fail-safe function illuminates a warning light to inform the driver of the malfunction.


Memory function

•  The memory function stores the DTC for the malfunction of input/output signals for related parts, as determined by the failure detection function.


Self-malfunction diagnostic function

•  The self-malfunction diagnostic function determines that there is a malfunction, and outputs a signal, as a DTC, to the DLC-2. The DTC can be read out using the Mazda Modular Diagnostic System (M-MDS).

HS-CAN

DTC output module

DTC

Malfunction location
PCM (PCM connector (2 types))
U0073
CAN system communication error
U0101
Communication error to TCM
U0129
Communication error to DSC/RSC HU/CM
U0155
Communication error to instrument cluster
PCM (PCM connector (3 types))
U0101
Communication error to TCM
U0140
Communication error to BCM
TCM (AW6A-EL, AW6AX-EL)
U0073
CAN system communication error
U0100
Communication error to PCM
U0121
Communication error to DSC/RSC HU/CM
U0140
Communication error to BCM
U0415
Abnormal message from DSC/RSC HU/CM
TCM (AY6A-EL, AY6AX-EL)
U0073:00
CAN system communication error
U0100:00
Communication error to PCM
U0121:00
Communication error to DSC/RSC HU/CM
U0155:00
Communication error to instrument cluster
U0415:00
Abnormal message from DSC/RSC HU/CM
DSC/RSC HU/CM
U0073
CAN system communication error
U0100
Communication error to PCM
U0140
Communication error to BCM
U0155
Communication error to instrument cluster
BCM
U0073
CAN system communication error
U0100
Communication error to PCM
U0101
Communication error to TCM
U0121
Communication error to DSC/RSC HU/CM
U0401
Abnormal message from PCM
4WD control module*1
U0073
CAN system communication error
U0100
Communication error to PCM
U0101
Communication error to TCM
U0121
Communication error to DSC/RSC HU/CM
U0155
Communication error to instrument cluster
Keyless control module*2
U0073
CAN system communication error
U0100
Communication error to PCM
U0140
Communication error to BCM
U0323
Communication error to instrument cluster
U2023
Abnormal message from PCM
PLG control module*3
U0073
CAN system communication error
U0100
Communication error to PCM
U0101
Communication error to TCM
U0140
Communication error to BCM
U0155
Communication error to instrument cluster
U0214
Communication error to keyless control module
Position memory control module*4
U0001:88
CAN system communication error
U0100:00
Communication error to PCM
U0101:00
Communication error to TCM
U0121:00
Communication error to DSC/RSC HU/CM
U0140:00
Communication error to BCM
U0155:00
Communication error to instrument cluster
U0431:68
Abnormal message from BCM
SAS control module
U0073
CAN system communication error
U0155
Communication error to instrument cluster
Theft-deterrent control module*5, *6
U0001:88
CAN system communication error
U0100:00
Communication error to PCM
U0140:00
Communication error to BCM
Instrument cluster
U0073
CAN system communication error
U0100
Communication error to PCM
U0101
Communication error to TCM
U0114
Communication error to 4WD control module
U0121
Communication error to DSC/RSC HU/CM
U0140
Communication error to BCM
U0151
Communication error to SAS control module
U0214
Communication error to keyless control module
U2510
Communication error to PCM

*1  :With 4WD
*2  :With advanced keyless entry and start system
*3  :With PLG system
*4  :With position memory control system
*5  :With theft-deterrent system
*6  :L.H.D. only

MS-CAN (L.H.D.)

DTC output module

DTC

Malfunction location
Information display*1
U0181 HEC
Communication error to instrument cluster
U0184 ACU
Communication error to audio unit
U2516
CAN system communication error
Information display*2
02:3E
Communication error to instrument cluster
02:1E
Communication error to audio unit
01:Er
CAN system communication error
Audio unit*1, *3
U0010:88
(Device code 16, error code 12)
CAN system communication error
U0156:00
Communication error to information display
Audio unit*2
16:Er12
CAN system communication error

*1  :Without display (audio unit)
*2  :With display (audio unit)
*3  :With Bose®

MS-CAN (R.H.D.)

DTC output module

DTC

Malfunction location
Information display*1
U0181 HEC
Communication error to instrument cluster
U0184 ACU
Communication error to car-navigation unit
U2516
CAN system communication error
Information display*2
02:3E
Communication error to instrument cluster
02:1E
Communication error to audio unit
01:Er
CAN system communication error
Bluetooth unit*3
Device code 26, error code 81
CAN system communication error
Audio unit*2, *4
U0010:88
(Device code 16, error code 12)
CAN system communication error
U0156:00
Communication error to information display
Car-navigation unit*3
Device code 16, error code 12
CAN system communication error
Device code 17, error code 11
Communication error to instrument cluster
Device code 23, error code 11
Communication error to audio amplifier

*1  :With car-navigation system
*2  :Without car-navigation system
*3  :With Bluetooth system (HF/TEL system)
*4  :With Bose®


Narrowing down malfunction locations

•  When the CAN system is thought to be malfunctioning based on the repair order form and the malfunctioning symptom, perform the CAN system on-board diagnosis.
•  DTCs are output due to a control module or sensor malfunction, or incorrect power supply. Verify the output DTCs and first inspect the DTCs not shown in the DTC table.
•  The open circuit location in the CAN system can be determined by verifying the DTCs detected in each module and by the module which has failed.
•  It is possible for signal error DTCs to be output in addition to communication error DTCs if there is an open circuit. Determine the open circuit location if the communication error and signal error DTCs are output simultaneously.
•  For DTC details, refer to the “Self-malfunction diagnostic function”. (See Self-malfunction diagnostic function.)

Troubleshooting procedure

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Example (L.H.D. (PCM connector (2 types))): DSC/RSC HU/CM-related wiring harness open circuit (if DTC is output)

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

Module

Displayed DTC

Probable malfunction location
PCM (PCM)
U0129
Communication error to DSC/RSC HU/CM
TCM (TCM)
U0121
Communication error to DSC/RSC HU/CM
GEM (BCM)
U0121
Communication error to DSC/RSC HU/CM
4X4 (4WD control module)
U0121
Communication error to DSC/RSC HU/CM
DSM (position memory control module)
U0121:00
Communication error to DSC/RSC HU/CM
IC (instrument cluster)
U0121
Communication error to DSC/RSC HU/CM

Module

Fail
ABS (DSC/RSC 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/RSC HU/CM and PCM/TCM/BCM/4WD control module/position memory control module/ instrument cluster. In addition, the wiring harness between the DSC HU/CM and connector C-36 is considered to be malfunctioning because “Fail” is displayed for the DSC/RSC HU/CM.


Example (R.H.D. (PCM connector (2 types))): DSC/RSC HU/CM-related wiring harness open circuit (if DTC is output)

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

Module

Displayed DTC

Probable malfunction location
PCM (PCM)
U0129
Communication error to DSC/RSC HU/CM
TCM (TCM)
U0121
Communication error to DSC/RSC HU/CM
GEM (BCM)
U0121
Communication error to DSC/RSC HU/CM
4X4 (4WD control module)
U0121
Communication error to DSC/RSC HU/CM
DSM (position memory control module)
U0121:00
Communication error to DSC/RSC HU/CM
IC (instrument cluster)
U0121
Communication error to DSC/RSC HU/CM

Module

Fail
ABS (DSC/RSC 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/RSC HU/CM and PCM/TCM/BCM/4WD control module/position memory control module/ instrument cluster. In addition, the wiring harness between the DSC/RSC HU/CM and connector C-36 is considered to be malfunctioning because “Fail” is displayed for the DSC/RSC HU/CM.