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DTC U0073:00 [INTEGRATED STARTER GENERATOR (ISG)]

DTC U0073:00 [INTEGRATED STARTER GENERATOR (ISG)]


id140202301800


Outline

System malfunction location

Module communication error (CAN BUS No.1)

Detection condition
•  The integrated starter generator (ISG) detects a CAN BUS communication line (CAN BUS No.1) malfunction for 1 s or more.
Precondition
•  1.5 s have elapsed after the ignition was switched ON (engine off or on)
•  The initialization for the stator coil drive circuit in the integrated starter generator (ISG) is completed.
•  The voltage at terminal 1A is 10 V or more for a continuous 1.5 s.
Fail-safe
•  Stops power supply from the Mazda M Hybrid battery and supplies power to the vehicle’s electrical devices (12 V power supply) from the 12 V battery.(If the vehicle continues to be driven while the DTC is detected, the 12 V battery will be depleted and the vehicle can no longer be driven.)
•  Inhibits the i-stop control.
•  Inhibits the non-power generation control.
•  Inhibits regenerative braking by the integrated starter generator (ISG).
•  Inhibits motor assist control by the integrated starter generator (ISG).
Possible cause
•  Malfunction in CAN bus communication line
•  Integrated starter generator (ISG) malfunction
System wiring diagram
•  Not applicable
Connector diagram
•  Not applicable


Diagnostic Procedure

•  Perform an inspection in accordance with the multiplex communication system diagnostic procedure. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].)