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DTC B1178:
F-CAN Communication Circuit Error
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Clear the DTCs with the HDS.
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Turn the ignition switch to LOCK (0), and then back to ON (II).
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Check for DTCs with the HDS.
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Are DTCs B1168, B1169, B1170, B1178, B1183 and/or B1187 indicated?
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YES
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Go to the indicated DTCs troubleshooting.■
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NO
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Intermittent failure, the F-CAN communication line is OK at this time. Check for worn or shorted wires.■
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