DTC U0073:00 [INTEGRATED STARTER GENERATOR (ISG)]
id140202301800
Outline
System malfunction location |
Module communication error (CAN BUS No.1) |
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Detection condition
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• 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.
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Fail-safe
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• 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).
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Possible cause
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• Malfunction in CAN bus communication line
• Integrated starter generator (ISG) malfunction
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System wiring diagram
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• Not applicable
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Connector diagram
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• Not applicable
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Diagnostic Procedure