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DTC Advanced Diagnostics: U3003-17
DTC U3003-17: Brake Booster Control Unit Power Circuit (+B) High Voltage
NOTE
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Initial Diagnosis:
The initial on-board diagnosis occurs right after the vehicle condition is turned to the ON mode, and the brake system indicator (red or amber) comes on, and continues until the indicator goes off. |
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Regular Diagnosis:
The regular on-board diagnosis begins right after the brake system indicator (red or amber) goes off, and it continues until the vehicle condition is turned to the OFF (LOCK) mode. |
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Review "How to Troubleshoot the Electric Brake Booster System" before doing the DTC troubleshooting procedure. |
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Test-drive the vehicle according to local traffic conditions and regulations. Do not test-drive on a lift unless specified. |
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The possible causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes. |
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Confirmation Procedure |
With the Driving Pattern:
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1. |
Turn the vehicle to the ON mode. | |
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Execution |
Regular Diagnosis |
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Duration |
About 2 seconds |
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DTC Type |
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1 drive cycle |
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Brake system indicator (red) on (Dependant upon the conditions) |
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Brake system indicator (amber) on | |
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Fail Safe Action |
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Stop servo control function (Dependant upon the conditions) |
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Stop automatic brake hold function (Dependant upon the conditions) |
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Stop ACC function (Dependant upon the conditions)* |
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Stop CMBS function (Dependant upon the conditions)* | |
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Possible Cause |
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Alternator failure |
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Abnormal 12 volt battery |
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Electric brake booster internal failure | | |
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