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The ASC-ECU is energized by the valve power supply circuit (+BV terminal). When
the power is supplied from the ignition switch (IG1) to the IG1 relay in ETACS-ECU, IG1 relay
is turned on. At this time, the valve power supply circuit (IG1 terminal) energizes the ASC-ECU.
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This diagnosis code is set when the ASC-ECU power supply voltage is more than 18.0 ± 1.0
V.
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- Battery failure
- ASC-ECU malfunction
- Charging system failed
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Use M.U.T.-III to diagnose the CAN bus lines.
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Q.
Is the check result normal?
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Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
On completion, go to Step 2.
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Q.
Is the diagnosis code No. C2101 set?
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This diagnosis is complete.
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Refer to GROUP 54A - Battery Test .
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Q.
Is the battery in good condition?
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Charge or replace the battery. Then go to Step 4.
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Refer to GROUP 16 - On-vehicle Service/Alternator Output Line
Voltage Drop Test .
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Q.
Is the check result normal?
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Repair or replace the charging system component(s).
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Erase the diagnosis code.
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Q.
Is the diagnosis code No. C2101 set?
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Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ).
Then go to Step 6.
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The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to Use Troubleshooting/How to Cope with Intermittent Malfunctions ).
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Erase the diagnosis code.
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Q.
Is the diagnosis code No. C2101 set?
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This diagnosis is complete.
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