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

id094000104100


Block Diagram

HS-CAN (L.H.D. Except MZR-CD 2.2, MZR 2.0 DISI i-stop)

am3zzn00001931

HS-CAN (L.H.D. MZR-CD 2.2)

am3zzn00001932

HS-CAN (L.H.D. MZR 2.0 DISI i-stop)

am3zzn00002444

HS-CAN (R.H.D. Except MZR-CD 2.2, MZR 2.0 DISI i-stop, ZY)

am3zzn00001933

HS-CAN (R.H.D. MZR-CD 2.2)

am3zzn00001934

HS-CAN (R.H.D. MZR 2.0 DISI i-stop)

am3zzn00002445

HS-CAN (R.H.D. ZY)

am3zzn00002955

MS-CAN (L.H.D.)

am3zzn00001935

MS-CAN (R.H.D.)

am3zzn00001936

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 (LF)
U0073:00
CAN system communication error
U0101:00
Communication error to TCM
U0121:00
•  Communication error to DSC HU/CM (with DSC)
•  Communication error to ABS HU/CM (with ABS)
U0155:00
Communication error to instrument cluster
PCM (Z6, ZY)
U0073:00
CAN system communication error
U0121:00
•  Communication error to DSC HU/CM (with DSC)
•  Communication error to ABS HU/CM (with ABS)
U0131:00
Communication error to EHPAS control module
U0155:00
Communication error to instrument cluster
PCM (MZ-CD 1.6 (Y6) (EURO4 emission level))
U0001
CAN system communication error
U0073
CAN system communication error
U0118
Communication error to fuel additive control module
U0121
Communication error to ABS HU/CM (with ABS)
U0122
Communication error to DSC HU/CM (with DSC)
U0155
Communication error to instrument cluster
U0416
Signal error from DSC HU/CM (with DSC)
PCM (MZ-CD 1.6 (Y6) (EURO5 emission level))
U0001:00
CAN system communication error
U0121:00
•  Communication error to DSC HU/CM (with DSC)
•  Communication error to ABS HU/CM (with ABS)
U0140:00
Communication error to BCM
U0167:00
Communication error to instrument cluster
U0415:00
•  Signal error from DSC HU/CM (with DSC)
•  Signal error from ABS HU/CM (with ABS)
U0426:00
Signal error from instrument cluster
PCM (MZ-CD 2.2)
U0073:00
CAN system communication error
U0121:00
Communication error to DSC HU/CM (with DSC)
Communication error to ABS HU/CM (with ABS)
U0155:00
Communication error to instrument cluster
PCM (MZR 2.0 DISI i-stop)
U0073:00
CAN system communication error
U0121:00
•  Communication error to DSC HU/CM (with DSC)
•  Communication error to ABS HU/CM (with ABS)
U0131:00
Communication error to EHPAS control module
U0140:00
Communication error to BCM
U0155:00
Communication error to instrument cluster
U0214:00
Communication error to Keyless control module
PCM (L3 Turbo)
U0073:00
CAN system communication error
U0121:00
Communication error to DSC HU/CM
U0131:00
Communication error to EHPAS control module
U0140:00
Communication error to BCM
U0155:00
Communication error to instrument cluster
TCM*1
U0073:00
CAN system communication error
U0100:00
Communication error to PCM
U0121:00
•  Communication error to DSC HU/CM (with DSC)
•  Communication error to ABS HU/CM (with ABS)
EHPAS control module
U0073
CAN system communication error
U0100
Communication error to PCM
U0140
Communication error to BCM
U0155
Communication error to instrument cluster
U0401*8
Signal error from PCM
U2023
Signal error from PCM
DSC HU/CM*2
U0001:88
CAN system communication error (BUS off)
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
U0401:00
Signal error from PCM
U0402:00
•  Signal error from PCM (MTX, ATX (FN4A-EL))
•  Signal error from TCM (ATX (FS5A-EL))
U0422:00
Signal error from BCM
U0428:62
Signal error from BCM
U0428:64
Signal error from BCM
ABS HU/CM*3
U0001:88
CAN system communication error (BUS off)
U0100:00
Communication error to PCM
U0155:00
Communication error to instrument cluster
BCM
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 (with DSC)
•  Communication error to ABS HU/CM (with ABS)
U0151:00
Communication error to SAS control module
U0214:00
Communication error to keyless control module
U0401:68
Signal error from PCM
Rear vehicle monitoring control module (RH)*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 (with DSC)
•  Communication error to ABS HU/CM (with ABS)
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 (with DSC)
•  Signal error from ABS HU/CM (with ABS)
Fuel additive control module*5
U1900
CAN system communication error
U2516
CAN system communication error
SAS control module
U0073
CAN system communication error
U0155
Communication error to instrument cluster
Keyless control module*6
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 (with DSC)
•  Communication error to ABS HU/CM (with ABS)
AFS control module*7
U0001:88
CAN system communication error
U0100:00
Communication error to PCM
U0140:00
Communication error to BCM
Instrument cluster
U0001:88
CAN system communication error (HS-CAN)
U0100:00
Communication error to PCM
U0100:87
Communication error to PCM (no response)
U0101:00
Communication error to TCM
U0121:00
•  Communication error to DSC HU/CM (with DSC)
•  Communication error to ABS HU/CM (with ABS)
U0131:00
Communication error to EHPAS control module
U0140:00
Communication error to BCM
U0151:00
Communication error to SAS control module
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
U0401:92
Signal error from PCM
U0402:68
Signal error from TCM
U0402:92
Signal error from TCM
U0415:68
•  Signal error from DSC HU/CM (with DSC)
•  Signal error from ABS HU/CM (with ABS)
U0415:92
•  Signal error from DSC HU/CM (with DSC)
•  Signal error from ABS HU/CM (with ABS)
U0452:92
Signal error from SAS control module
U0483:68
Signal error from AFS control module
U0483:92
Signal error from AFS 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  :ATX
*2  :With DSC
*3  :With ABS
*4  :With rear vehicle monitoring system
*5  :MZ-CD 1.6 (Y6) (EURO4 emission level)
*6  :with advanced keyless entry and push button start system
*7  :with AFS (adaptive front lighting system)
*8  :MZR 2.0 DISI i-stop

MS-CAN

DTC output module

DTC

Malfunction location
Information display*1
U0164 EATC
Communication error to climate control unit
U0181 HEC
Communication error to instrument cluster
U0184 ACU
Communication error to audio unit
U2516*1
CAN system communication error
Multi information display*2
U0155
Communication error to instrument cluster
U0164
Communication error to climate control unit
U0184
Communication error to audio unit
U0423
Invalid data received from instrument cluster
U2516*1
CAN system communication error
Water heater unit*3
U1900*1
CAN system communication error
U2516*1
CAN system communication error
Bluetooth unit*4
U0498:68*1
(26:Er81)
CAN system communication error
Audio unit
U0010:88*1
(16:Er12)
CAN system communication error
U0155:00
(16:Er11/17:Er12)
Communication error to instrument cluster
U0156:00
Communication error to multi information display
U0197:00
Communication error to Bluetooth unit
U0423:68
Invalid date received from Instrument cluster
Climate control unit*5
U0010:88*1
CAN system communication error
U0155:00
Communication error to instrument cluster
U0156:00
Communication error to information display
U0166:00
Communication error to water heater unit
U0423:68
Invalid date received from instrument cluster
U0425:68
Invalid date received from water heater unit
Instrument cluster
U0010:88*1
Module communication error (MS-CAN)
U0156:00
Communication error to multi information display
U0164:00
Communication error to climate control unit
U0166:00
Communication error to water heater unit

*1  :Without maintenance monitor
*2  :With maintenance monitor
*3  :With water heater system
*4  :With Bluetooth system (HF/TEL 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

am3zzn00002087

Example (L.H.D. (LF)): 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)
U0121:00
Communication error to DSC HU/CM
RVM (rear vehicle monitoring control module (RH))
U0121:00
Communication error to DSC HU/CM
RKE (keyless control module)
U0121:00
Communication error to DSC HU/CM
IC (instrument cluster)
U0121:00
Communication error to DSC HU/CM

Module

Fail
ABS (DSC HU/CM)
×

am3zzn00003068

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 / rear vehicle monitoring control module (RH) / keyless control module / instrument cluster. In addition, the wiring harness between the DSC HU/CM and connector C-41 is considered to be malfunctioning because “Fail” is displayed for the DSC HU/CM.


Example (R.H.D. (LF)): 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)
U0121:00
Communication error to DSC HU/CM
RVM (rear vehicle monitoring control module (RH))
U0121:00
Communication error to DSC HU/CM
RKE (keyless control module)
U0121:00
Communication error to DSC HU/CM
IC (instrument cluster)
U0121:00
Communication error to DSC HU/CM

Module

Fail
ABS (DSC HU/CM)
×

am3zzn00003069

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 / rear vehicle monitoring control module (RH) / keyless control module / instrument cluster. In addition, the wiring harness between the DSC HU/CM and connector C-41 is considered to be malfunctioning because “Fail” is displayed for the DSC HU/CM.