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DTC U0121:00 [DASH-ELECTRICAL SUPPLY UNIT (E)]

id0702k80086ka

Without Mazda M Hybrid

Outline

System malfunction location

Communication error with DSC HU/CM

Detection condition

•  The dash-electrical supply unit cannot receive CAN signal from the DSC HU/CM.

Fail-safe

•  The value of the data which is not received from the DSC HU/CM is fixed at the specified value.

Possible cause

•  Malfunction in CAN communication line between DSC HU/CM and dash-electrical supply unit

System wiring diagram

Not applicable

Connector diagram

Not applicable

System malfunction location	Communication error with DSC HU/CM
Detection condition	• The dash-electrical supply unit cannot receive CAN signal from the DSC HU/CM.
Fail-safe	• The value of the data which is not received from the DSC HU/CM is fixed at the specified value.
Possible cause	• Malfunction in CAN communication line between DSC HU/CM and dash-electrical supply unit
System wiring diagram	Not applicable
Connector diagram	Not applicable

Diagnostic procedure

• Perform the malfunction diagnosis according to the troubleshooting procedure for the multiplex communication system. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].)

With Mazda M Hybrid

Outline

System malfunction location

Communication error with electronically controlled brake unit

Detection condition

•  The dash-electrical supply unit cannot receive CAN signal from the electronically controlled brake unit.

Fail-safe

•  The value of the data which is not received from the electronically controlled brake unit is fixed at the specified value.

Possible cause

•  Malfunction in CAN communication line between electronically controlled brake unit and dash-electrical supply unit

System wiring diagram

Not applicable

Connector diagram

Not applicable

System malfunction location	Communication error with electronically controlled brake unit
Detection condition	• The dash-electrical supply unit cannot receive CAN signal from the electronically controlled brake unit.
Fail-safe	• The value of the data which is not received from the electronically controlled brake unit is fixed at the specified value.
Possible cause	• Malfunction in CAN communication line between electronically controlled brake unit and dash-electrical supply unit
System wiring diagram	Not applicable
Connector diagram	Not applicable

Diagnostic procedure

• Perform the malfunction diagnosis according to the troubleshooting procedure for the multiplex communication system. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].)