REGENERATIVE BRAKING IS NOT POSSIBLE
id300300000400
Outline
Malfunction symptom |
Regenerative braking is not possible |
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Description
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• During deceleration, the high voltage battery level indication does not increase.
• During deceleration, the power meter does not move to the CHARGE side (However, except for immediately after charging is completed or when high voltage battery is at low temperature).
• The amount of increase in the high voltage battery level indication varies even if the vehicle speed is decreased by the same power.
• Variation in deceleration when releasing the accelerator pedal.
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Possible cause
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Regenerative braking amount is restricted:
• PCM restricts regenerative braking amount based on signal from drive motor control module
• PCM restricts regenerative braking amount based on signal from BECM
• The PCM restricts the regenerative braking amount based on the signal from the electronically controlled brake unit. (normal operation)
Regenerative braking inhibition condition:
• PCM restricts regenerative braking based on signal from electronically controlled brake unit
Target regenerative braking amount changes:
• PCM detects drive mode change
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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 |
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1
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VERIFY EV SYSTEM RELATED DTCs
• Perform the DTC inspections for the following modules.
(See DTC INSPECTION.)
• Are 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 (e-SKYACTIV)].)
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No
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Go to the next step.
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2
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VERIFY HOW CUSTOMER USES VEHICLE
• Verify the following driving conditions based on the contents of the interview with the customer.
• Does the customer’s driving situation apply?
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Yes
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Explain to the customer that the regenerative braking inhibition or restriction is performed due to the driving operations when the customer decelerates.
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No
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Explain to the customer that the regenerative braking inhibition or restriction is performed when the vehicle detects the following during deceleration.
• High voltage battery is fully charged and power generated by regenerative braking cannot be accepted (high voltage battery state of charge (SOC) is 95% or more)
• Excessive temperature increase in electric motor or inverter
• High voltage battery temperature is high or low
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Repair completion verification
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VERIFY THAT VEHICLE IS REPAIRED
• Install/connect the part removed/disconnected during the troubleshooting procedure.
• Has the malfunction symptom been eliminated?
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Yes
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Complete the symptom troubleshooting. (Explain contents of repair to customer.)
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No
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Refer to the CAN (controller area network) malfunction diagnosis flow to inspect for a CAN communication error.
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