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DTC Advanced Diagnostics: U0100-00
DTC U0100-00: CAN Communication Failure with ECM/ISU
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 ABS/VSA indicator comes on, and continues until the indicator goes off. |
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Regular Diagnosis:
The regular on-board diagnosis begins right after the ABS/VSA indicator 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 VSA 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 |
Basic Condition:
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12 volt battery voltage 9.6 - 16.5 V |
With the Driving Pattern:
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1. |
Start the engine. |
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2. |
Test-drive the vehicle at 6 mph (10 km/h) or more. | |
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Execution |
Regular Diagnosis |
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Duration |
About 1 second |
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DTC Type |
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1 drive cycle |
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Brake system indicator (red) blink |
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Brake system indicator (amber) on |
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VSA indicator on | |
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Fail Safe Action |
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Degrade ABS performance |
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Stop engine drag torque control function |
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Stop TCS function |
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Stop VSA function |
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Stop agile handling assist function |
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Stop brake assist function (Dependant upon the conditions) |
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Stop hill start assist function |
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Stop automatic brake hold function |
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Stop automatic operating function (Drive away assist) |
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Stop ignition OFF apply function |
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Stop ACC function* |
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Stop CMBS function* | |
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Possible Cause |
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Open or Poor connection between the VSA modulator-control unit and the PCM (F-CAN lines) |
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PCM internal failure |
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VSA modulator-control unit internal failure | | |
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