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1
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INSPECT BRAKE FLUID AMOUNT AND VERIFY THAT ELECTRIC PARKING BRAKE RELEASED
• Inspect the brake fluid amount and verify that the electric parking brake released.
• Is the brake fluid amount normal?
• Is the electric parking brake released?
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Yes
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Go to the next step.
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No
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Add the brake fluid or release the electric parking brake.
If the brake fluid refilled:
• Inspect and repair the brake line for leakage.
Perform the repair completion verification.
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2
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CONFIRM ELECTRONICALLY CONTROLLED BRAKE UNIT DTC
• Retrieve the electronically controlled brake unit DTC using the M-MDS.
• Are any DTCs present?
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Yes
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Go to the applicable DTC inspection.
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No
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If communication error message is displayed on the M-MDS screen:
• Go to the next step.
If communication error message is not displayed:
• Go to Step 4.
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3
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INSPECT CONNECTION OF ELECTRONICALLY CONTROLLED BRAKE UNIT CONNECTOR
• Inspect for connection of the electronically controlled brake unit connector.
• Is the electronically controlled brake unit connector connected securely?
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Yes
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Go to the next step.
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No
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Connect the electronically controlled brake unit connector securely, then go to the next step.
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4
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CONFIRM INSTRUMENT CLUSTER OPERATION RECORD
• Retrieve the warning system operation history using the M-MDS.
• Is the brake system warning light illumination history recorded?
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Yes
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If the Brake Waning Lamp recorded:
• Go to Step 5.
If the Brake Waning Lamp (Brake fluid low) recorded:
• Go to Step 6.
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No
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Go to Step 8.
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5
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VERIFY WHETHER MALFUNCTION IS IN INSTRUMENT CLUSTER OR ELSEWHERE
• Connect the M-MDS to the DLC-2.
• Ignition is switched ON (engine off).
• Do the ABS warning light, brake system warning light, DSC indicator light and DSC OFF indicator light turn on and off according to the simulation?
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Yes
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Go to Step 8.
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No
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Replace the instrument cluster, and perform the repair completion verification.
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6
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INSPECT WHETHER MALFUNCTION IS IN BRAKE FLUID LEVEL SENSOR OR ELSEWHERE
• Inspect the brake fluid level sensor.
• Is the continuity condition normal?
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Yes
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Go to the next step.
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No
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Replace the malfunctioning part, and perform the repair completion verification.
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*7
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INSPECT BRAKE FLUID LEVEL SENSOR SIGNAL CIRCUIT FOR SHORT TO GROUND
• Inspect the signal circuit for a short to ground.
• Is the circuit normal?
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Yes
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Retrieve the electronically controlled brake unit DTC using the M-MDS.
If the DTC remains:
• Go to the applicable DTC inspection.
If the DTC does not remain:
• Replace the electronically controlled brake unit.
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No
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Repair or replace the malfunctioning location, and perform the repair completion verification.
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*8
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INSPECT ELECTRONICALLY CONTROLLED BRAKE UNIT POWER SUPPLY CIRCUIT FOR SHORT TO GROUND AND OPEN CIRCUIT
• Inspect the power supply circuit for an open circuit and short to ground.
• Is the circuit normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location, and perform the repair completion verification.
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*9
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INSPECT ELECTRONICALLY CONTROLLED BRAKE UNIT GROUND CIRCUIT FOR SHORT TO POWER SUPPLY AND OPEN CIRCUIT
• Inspect the ground circuit for an open circuit and short to power supply.
• Is the circuit normal?
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Yes
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Replace the electronically controlled brake unit, and perform the repair completion verification. (open circuit in the electronically controlled brake unit)
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No
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Repair or replace the malfunctioning location, and perform the repair completion verification.
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Repair completion verification
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VERIFY THAT MALFUNCTION SYMPTOMS DO NOT RECUR AFTER REPAIR
• 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 to the customer what has been repaired.
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No
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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.
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