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

ON-BOARD DIAGNOSTIC FUNCTION [CAN (CONTROLLER AREA NETWORK)]SM1935617

id094000104100

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 (L3 Turbo, L5)	U0073:00	CAN system communication error
	U0101:00	Communication error to TCM
	U0121:00	Communication error to DSC HU/CM
	U0155:00	Communication error to instrument cluster
PCM (MZR-CD 2.2)	U0073:00	CAN system communication error
	U0115:00	Communication error to SCR control unit
	U0121:00	Communication error to DSC HU/CM
	U0155:00	Communication error to instrument cluster
	U0442:00	Signal error from SCR control unit
	U0442:01
	U0442:02
SCR control unit ^*1	U0100:00	Communication error to PCM
	U0155:00	Communication error to instrument cluster
	U029D:00	Communication error to NOx sensor control module
	U0401:00	Signal error from PCM
	U0423:00	Signal error from instrument cluster
EHPAS control module ^*1	U0073	CAN system communication error
	U0100	Communication error to PCM
	U0140	Communication error to BCM
	U0155	Communication error to instrument cluster
	U2023	Abnormal message from PCM
TCM ^*2 (AW6A-EL)	U0073:00	CAN system communication error
	U0100:00	Communication error to PCM
	U0121:00	Communication error to DSC HU/CM
	U0140:00	Communication error to BCM
	U0415:00	Abnormal message from DSC HU/CM
TCM ^*2 (FS5A-EL)	U0073:00	CAN system communication error
	U0100:00	Communication error to PCM
	U0121:00	Communication error to DSC HU/CM
	U0401:00	Abnormal message from PCM
	U0415:00	Abnormal message from DSC HU/CM
DSC HU/CM	U0073	CAN system communication error
	U0100	Communication error to PCM
	U0101	Communication error to TCM
	U0114	Communication error to 4WD control module
	U0140	Communication error to BCM
	U1900	Communication error to other module
	U2023	Abnormal message from PCM
4WD control module ^*3	U0073	CAN system communication error
	U0100	Communication error to PCM
	U0101	Communication error to TCM (ATX)
	U0121	Communication error to DSC HU/CM
	U0140	Communication error to BCM (MTX)
	U0155	Communication error to instrument cluster
SAS control module	U0073	CAN system communication error
SAS control module	U0155	Communication error to instrument cluster
Rear vehicle monitoring 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 HU/CM
	U0140:00	Communication error to BCM
	U0155:00	Communication error to instrument cluster
	U0401:68	Signal error from PCM
	U0402:68	Signal error from TCM
	U0415:68	Signal error from DSC HU/CM
BCM	U0073	CAN system communication error
	U0100	Communication error to PCM
	U0121	Communication error to DSC HU/CM
Keyless control module ^*5	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
Instrument cluster	U0001:88	CAN system communication error
	U0100:00	Communication error to PCM
	U0100:87	Communication error to PCM (no response)
	U0101:00	Communication error to TCM
	U0114:00	Communication error to 4WD control module
	U0121:00	Communication error to DSC HU/CM
	U0131:00	Communication error to EHPAS control module
	U0140:00	Communication error to BCM
	U0151:00	Communication error to SAS control module
	U0214:00	Communication error to keyless control module
	U0233:00	Communication error to rear vehicle monitoring control module (RH)
	U0401:68	Signal error from PCM
	U0401:92	Signal error from PCM
	U0402:68	Signal error from TCM
	U0402:92	Signal error from TCM
	U0414:92	Signal error from 4WD control module
	U0415:68	Signal error from DSC HU/CM
	U0415:92	Signal error from DSC HU/CM
	U0422:68	Signal error from BCM
	U0452:92	Signal error from SAS control module
	U0515:68	Signal error from keyless control module
	U0515:92	Signal error from keyless control module
	U0533:68	Signal error from rear vehicle monitoring control module (RH)
	U2005:86	Signal error from PCM

*1:MZR-CD 2.2

*2:ATX

*3:4WD

*4:with rear vehicle monitoring system

*5:with advanced keyless entry and start system

MS-CAN

DTC output module	DTC	Malfunction location
Instrument cluster	U0010:88	CAN system communication error
	U0156:00	Communication error to multi information display
	U0164:00	Communication error to climate control unit
	U0166:00	Communication error to water heater unit
	U0424:68	Signal error from climate control unit
Buletooth unit ^*1	U0498:68 (26:Er81, Device code 26/Erroe code81)	CAN system communication error
Water heater unit ^*2	U0010:88	CAN system communication error
	U0155:00	Communication error to instrument cluster
	U0164:00	Communication error to climate control unit
	U0423:00	Invalid date received from instrument cluster
	U0424:00	Invalid date received from climate control unit
Audio unit ^*3	U0010:88 (16:Er12)	CAN system communication error
	U0155:00 (17:Er11)	Communication error to instrument cluster
	U0156:00	Communication error to multi information display
	U0186:00 (23:Er11)	Communication error to audio amplifier
	U0197:00	Communication error to Bluetooth unit
	U0423:68	Invalid date received from instrument cluster
Car-navigation unit ^*4	Device code 16:Erroe code 12	CAN system communication error
	Device code 17:Erroe code 11	Communication error to instrument cluster
	Device code 23:Erroe code 11	Communication error to audio amplifier
Climate control unit ^*5	U0155	Communication error to instrument cluster
	U0156	Communication error to multi information display
	U0516	CAN system communication error
Information display	U0164 EATC	Communication error to climate control unit
	U0181 HEC	Communication error to instrument cluster
	U0184 ACU	Communication error to audio unit
	U2516	CAN system communication error
Multi information display	U0155	Communication error to instrument cluster
	U0164	Communication error to climate control unit
	U0184	Communication error to audio unit
	U0423	Invalid date received from instrument cluster
	U2516	CAN system communication error

*1:with Bluetooth system

*2:with water heater system

*3:with audio system

*4:with car-navigation system

*5:with full-auto air conditioner

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 (L3 Turbo): DSC 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)	U0121:00	Communication error to DSC HU/CM
TCM (TCM)	U0121:00	Communication error to DSC HU/CM
4×4 (4WD control module)	U0121	Communication error to DSC HU/CM
RVM (Rear vehicle monitoring control module (RH))	U0121:00	Communication error to DSC HU/CM
BCM (BCM)	U0121	Communication error to DSC HU/CM
IC (instrument cluster)	U0121:00	Communication error to DSC HU/CM

Module	Fail
ABS (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 / 4WD control module / rear vehicle monitoring control module (RH) / BCM / instrument cluster. In addition, the wiring harness between the DSC HU/CM and branch B is considered to be malfunctioning because “Fail” is displayed for the DSC HU/CM.

Example (L5): DSC 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)	U0121:00	Communication error to DSC HU/CM
TCM (TCM)	U0121:00	Communication error to DSC HU/CM
BCM (BCM)	U0121	Communication error to DSC HU/CM
IC (instrument cluster)	U0121:00	Communication error to DSC HU/CM

Module	Fail
ABS (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 / BCM / instrument cluster. In addition, the wiring harness between the DSC HU/CM and branch B is considered to be malfunctioning because “Fail” is displayed for the DSC HU/CM.

Example (MZR-CD 2.2): DSC 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)	U0121:00	Communication error to DSC HU/CM
RVM (Rear vehicle monitoring control module (RH))	U0121:00	Communication error to DSC HU/CM
4×4 (4WD control module)	U0121	Communication error to DSC HU/CM
BCM (BCM)	U0121	Communication error to DSC HU/CM
IC (instrument cluster)	U0121:00	Communication error to DSC HU/CM

Module	Fail
ABS (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 / rear vehicle monitoring control module (RH) / 4WD control module / BCM / instrument cluster. In addition, the wiring harness between the DSC HU/CM and branch E is considered to be malfunctioning because “Fail” is displayed for the DSC HU/CM.