DTC C0021:4B [ELECTRONICALLY CONTROLLED BRAKE UNIT]
id0402c6016100
Outline
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System malfunction location |
Abnormal electronically controlled brake unit temperature |
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Detection condition
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• The electronically controlled brake unit detects an abnormally high temperature condition of the internal parts and the protection function operates.
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Fail-safe
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Refer to “DTC Table” and “Fail-safe Function Malfunction Contents Table”. (See DTC TABLE [ELECTRONICALLY CONTROLLED BRAKE UNIT].)
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Possible cause
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• Temperature in engine compartment is abnormally high
• Internal part temperature increases due to operating brakes for long periods
• Electronically controlled brake unit 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
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Step |
Inspection |
Results |
Action |
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1
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VERIFY IF ELECTRONICALLY CONTROLLED BRAKE UNIT TEMPERATURE WAS TEMPORARILY HIGH
• Start the engine and move the vehicle to a cool place.
• Switch the ignition off and wait for 30 min or more.
• Clear the DTC recorded in the memory.
(See CLEARING DTC.)
• Perform the DTC inspection for the electronically controlled brake unit.
(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, replace the electronically controlled brake unit and perform the repair completion verification.
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No
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Go to the next step.
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Repair completion verification
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VERIFY IF OTHER DTCs DISPLAYED
• Perform the DTC inspection.
(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.
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No
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DTC troubleshooting completed.
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