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

id094000104100


Block Diagram

HS-CAN

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MS-CAN

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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 Unit

DTC

Malfunction location
Instrument cluster
U0001:88
Module communication error (HS-CAN)
U0100:00
Communication error to PCM
U0100:87
Communication error between the instrument cluster and the PCM (no response)
U0101:00
Communication error to TCM
U0121:00
Communication error to ABS HU/CM (With ABS)
Communication error to DSC HU/CM (With DSC)
U0131:00
Communication error to EPS
U0140:00
Communication error to BCM
U0151:00
Communication error to SAS control module
U0166:00
Communication error to water heater unit
U0182:00
Communication error to AFS control module
U0214:00
Communication error to keyless control module
U0232:00
Communication error to rear vehicle monitoring control module (RH)
U0401:68
Signal error from PCM
U0402:68
Signal error from TCM
U0415:68
Signal error from DSC HU/CM (With ABS)
Signal error from DSC HU/CM (With DSC)
U0515:68
Signal error from keyless control module
PCM*1
U0073:00
CAN system communication error
U0101:00
Communication error to TCM
U0121:00
Communication error to ABS HU/CM (With ABS)
Communication error to DSC HU/CM (With DSC)
U0131:00
Communication error to EPS control module
U0140:00
Communication error to BCM
U0151:00
Communication error to SAS control module
U0155:00
Communication error to instrument cluster
PCM*2
U0073:00
CAN system communication error
U0121:00
Communication error to ABS HU/CM (With ABS)
Communication error to DSC HU/CM (With DSC)
U0155:00
Communication error to instrument cluster
TCM*3
U0073:00
CAN system communication error
U0100:00
Communication error to PCM
EPS control module
U0001:88
CAN system communication error
U0100:00
Communication error to PCM
U0401:00
Signal error from PCM
ABS HU/CM*4
U0001:88
CAN system communication error
U0100:00
Communication error to PCM
U0214:00*1
Communication error to keyless control module
DSC HU/CM*5
U0001:88
CAN system communication error
U0100:00
Communication error to PCM
U0101:00
Communication error to TCM
U0140:00
Communication error to BCM
U0155:00
Communication error to instrument cluster
U0214:00*6
Communication error to keyless control module
U0401:00
Signal error from PCM
U0401:68
Signal error from PCM
U0402:00
Signal error from TCM
BCM
U0001:88
Unit communication error (HS-CAN)
U0100:00
Communication error to PCM
U0101:00
Communication error to TCM
U0151:00
Communication error to SAS control module
U0214:00*6
Communication error to keyless control module
U0401:68
Signal error from PCM
U0402:68
Signal error from TCM
Rear vehicle monitoring control module*7
U0001:88
CAN system communication error
U0100:00
Communication error to PCM
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
U0415:68
Signal error from DSC HU/CM
SAS control module
U0001:88
CAN system communication error
U0155:00
Communication error to instrument cluster
Water heater unit*8
U0001:88
CAN system communication error
U0100:00
Communication error to PCM
U0140:00
Communication error to BCM
U0155:00
Communication error to instrument cluster
Keyless control module*6
U0001:88
Unit communication error (HS-CAN)
U0100:00
Communication error to PCM
U0101:00
Communication error to TCM
U0121:00
Communication error to ABS HU/CM (with ABS)
Communication error to DSC HU/CM (with DSC)
U0401:68
Signal error from PCM

*1  :L8, LF, L5
*2  :MZR-CD (RF Turbo), MZR-CD 2.2
*3  :ATX
*4  :with ABS
*5  :with DSC
*6  :with advanced keyless entry and push button start system
*7  :with rear vehicle monitoring system
*8  :with water heater system

MS-CAN

DTC Output Unit

DTC

Malfunction location
Instrument cluster
U0010:88
Module communication error (MS-CAN)
U0164:00
Communication error to climate control unit
Information display
U0001088
Module communication error (MS-CAN)
U015500HEC
Communication error to instrument cluster
U016400EATC
Communication error to climate control unit
U018400ACU
Communication error to audio unit
Audio unit (with audio system)
16:Er11
CAN system communication error
16:Er12
CAN system communication error
17:Er11
Communication error to instrument cluster
Car-navigation unit (with car-navigation system)
Device code 16:Error code 12
CAN system communication error
Device code 17:Error code 11
Communication error to instrument cluster
Climate control unit
U0010:88
CAN system communication error
U0155:00
Communication error to instrument cluster
U0184:00
Communication error to audio unit/car-navigation unit
U0423:68
Invalid date received from Instrument cluster
HF/TEL unit (with audio system)
26:Er81
CAN system communication error
HF/TEL unit (with car-navigation system)
Device code 26:Error code 81
CAN system communication error


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 (L8, LF, L5): ABS 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
U0121:00
Communication error to ABS/TCS HU/CM
Keyless control module
U0121:00
Communication error to ABS/TCS HU/CM
Instrument cluster
U0121:00
Communication error to ABS/TCS HU/CM

Module

Fail
ABS 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 ABS HU/CM and PCM/keyless control module/Instrument cluster. In addition, the wiring harness between the ABS HU/CM and branch B or the ABS HU/CM is considered to be malfunctioning because “Fail” is displayed for the ABS 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
U0121:00
Communication error to DSC HU/CM
Rear vehicle monitoring control module
U0121:00
Communication error to DSC HU/CM
Keyless control module
U0121:00
Communication error to DSC HU/CM
Instrument cluster
U0121:00
Communication error to DSC HU/CM

Module

Fail
DSC HU/CM
×

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2.  The wiring harness between the DSC HU/CM and branch B, or the DSC HU/CM itself could have a malfunction because DTCs are displayed indicating a communication error between the DSC HU/CM and PCM/keyless control module/rear vehicle monitoring control module/instrument cluster, in addition to “Fail” on the DSC HU/CM, even though communication between the PCM and the instrument cluster is normal.