DTC U0401:00 [INTEGRATED STARTER GENERATOR (ISG)]
id140202302000
Outline
System malfunction location |
Error signal received from PCM |
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Detection condition
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Determination conditions
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• The integrated starter generator (ISG) receives an error signal from the PCM for 1 s.
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Precondition
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• 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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• PCM malfunction
• 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
Step |
Inspection |
Results |
Action |
---|---|---|---|
1
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RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION
• Record the snapshot data.
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—
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Go to the next step.
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2
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VERIFY PCM DTC
• Perform the DTC inspection for the PCM.
(See DTC INSPECTION.)
• Are any DTCs displayed?
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Yes
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Repair the malfunctioning location according to the applicable DTC troubleshooting.
(See DTC TABLE [PCM (SKYACTIV-X)].)
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No
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Go to the next step.
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3
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INSPECT PCM FOR MALFUNCTION DEPENDING ON REPEATABILITY
• Install/connect the part removed/disconnected during the troubleshooting procedure.
• Clear the DTC recorded in the memory.
(See CLEARING DTC.)
• Switch the ignition off, then ON (engine off).
• Perform the DTC inspection for the integrated starter generator (ISG).
(See DTC INSPECTION.)
• Is the same Pending DTC present?
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Yes
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Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.
If the CAN communication is normal, perform the diagnosis from Step 1.
• If the malfunction recurs, replace the PCM.
Go to repair completion verification 1.
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No
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Go to the next step.
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4
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INSPECT PCM FOR MALFUNCTION DEPENDING ON REPEATABILITY AGAIN
• Perform the "Action for Non-repeatable Malfunction" procedure.
• Perform the DTC inspection for the integrated starter generator (ISG).
(See DTC INSPECTION.)
• Is the same Pending DTC present?
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Yes
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Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.
If the CAN communication is normal, perform the diagnosis from Step 1.
• If the malfunction recurs, replace the PCM.
Go to repair completion verification 1.
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No
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The system is normal. (Explain to the customer that a malfunction was detected temporarily, but the vehicle is currently normal.)
Go to repair completion verification 2.
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Repair completion verification 1
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VERIFY THAT VEHICLE IS REPAIRED
• Install/connect the part removed/disconnected during the troubleshooting procedure.
• Clear the DTC recorded in the memory.
(See CLEARING DTC.)
• Replicate the vehicle conditions at the time the DTC was detected using the following procedure.
• Perform the DTC inspection for the integrated starter generator (ISG).
(See DTC INSPECTION.)
• Is the same Pending DTC present?
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Yes
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Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.
If the CAN communication is normal, perform the diagnosis from Step 1.
• If the malfunction recurs, replace the integrated starter generator (ISG), then go to the next step.
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No
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Go to the next step.
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Repair completion verification 2
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VERIFY IF OTHER DTCs DISPLAYED
• Perform the DTC inspection.
(See DTC INSPECTION.)
• Are any other DTCs displayed?
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Yes
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Repair the malfunctioning location according to the applicable DTC troubleshooting.
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No
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DTC troubleshooting completed.
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