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Home >> Mazda >> 2024 >> CX-90 Turbo Select >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Electric Motor Systems >> On-Board Diagnostic - Drive Motor Control Module (E-SKYACTIV PHEV) >> DTC U0074-00: Can Communication: Bus Off (At-Bus)

DTC U0074-00: Can Communication: Bus Off (At-Bus)

WARNING: <<High voltage>>
  • If the necessary measures are not taken before servicing an electric vehicle, it could cause electrical shock and result in serious injury or, in the worst case, death. Before servicing the electric vehicle, refer to [HIGH VOLTAGE SERVICE CAUTIONS ] in the general information and implement the necessary measures. (Refer to [HIGH VOLTAGE SERVICE CAUTIONS ] in service information).
U0074-00: (SGC2/DMCM (E-SKYACTIV PHEV)) DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location CAN communication: Bus off (AT-bus)
Detection condition
  • Malfunction in CAN bus communication line.
Fail-safe
  • Not applicable
Possible cause
WARNING: <<High voltage>>
  • If necessary measures such as wearing the correct protective gear are not taken when inspecting or removing/installing the high voltage parts, it could cause electrical shock and result in serious injury or, in the worst case, death.
  • Before inspecting or removing/installing the high voltage parts, refer to [HIGH VOLTAGE SERVICE CAUTIONS ] in the general information and [High Voltage Part Inspection and Removal/Installation Notes] of the high voltage system service cautions and implement the necessary measures and preparations. (Refer to [HIGH VOLTAGE SERVICE CAUTIONS ] in service information). (Refer to [HIGH VOLTAGE SYSTEM SERVICE CAUTIONS ] in service information).
  • Wear insulated gloves when working on a high voltage system.
  1. DTCs are stored in the following modules.
  2. Malfunction in wiring harness (including connector/terminal) between C-18 connector and ECM (See CIRCUIT INSPECTION .) (See CONNECTOR INSPECTION .)
  3. Malfunction in wiring harness (including connector/terminal) between C-68 connector and drive motor control module (See CIRCUIT INSPECTION .) (See CONNECTOR INSPECTION .)
  4. Malfunction in wiring harness (including connector/terminal) between PCM and drive motor control module (See CIRCUIT INSPECTION .) (See CONNECTOR INSPECTION .)
  5. Malfunction in wiring harness (including connector/terminal) between selector lever and drive motor control module (See CIRCUIT INSPECTION .) (See CONNECTOR INSPECTION .)
  6. Malfunction in wiring harness (including connector/terminal) between backup power supply unit and drive motor control module (See CIRCUIT INSPECTION .) (See CONNECTOR INSPECTION .)
  7. Malfunction in wiring harness (including connector/terminal) between TCM and drive motor control module (See CIRCUIT INSPECTION .) (See CONNECTOR INSPECTION .)
  8. Malfunction in wiring harness (including connector/terminal) between drive motor control module and ECM (See CIRCUIT INSPECTION .) (See CONNECTOR INSPECTION .) (Refer to [HIGH VOLTAGE BATTERY REMOVAL/INSTALLATION ] in service information).
  9. Drive motor control module malfunction (Refer to [INVERTER REMOVAL/INSTALLATION ] in service information).
Repeatability verification procedure
  1. Clear the DTC recorded in the memory. (See CLEARING DTC .)
  2. Switch the main power ON (READY on).
G16691048Courtesy of MAZDA MOTORS CORP.
1 Drive motor control module
2 C-68 connector
3 C-18 connector
4 ECM
5 PCM
6 Selector lever
7 Backup power supply unit
8 TCM
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