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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

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)].)