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- Connect the M.U.T.-III to the diagnosis connector.
- When the power of Vehicle Communication Interface (V.C.I.) is turned to ON, the indicator lamp of the Vehicle Communication Interface (V.C.I.) illuminates in green.
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OK: The indicator lamp of the Vehicle Communication Interface (V.C.I.) illuminates in green.
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Q.
Is the check result normal?
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- Check battery (Refer to GROUP 54A - Battery - On-vehicle Service - Battery Test).
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Q.
Is the check result normal?
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- Voltage between terminal ETACS-ECU MUT line and body earth.
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Q.
Is the check result normal?
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- Disconnect connectors, and measure at the ETACS-ECU side.
- Continuity check between terminal +B1 and MUT
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Q.
Is the check result normal?
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Repair or replace the connector, or check fuse in the ETACS-ECU, and replace if necessary. If the fuse is normal, replace the ETACS-ECU.
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- Check power supply line for open/short circuit.
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Q.
Is the check result normal?
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Repair or replace the connector, or repair the damaged harness wire, or replace the ETACS-ECU.
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- Check power supply line for damage.
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Q.
Is the check result normal?
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Repair or replace the connector, or repair the damaged harness wire.
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- Resistance between terminal earthing lines and body earth.
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OK: Continuity (2 Ω or less)
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Q.
Is the check result normal?
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![](../../../buttons/03btn002.png)
Repair or replace the connector, or check and repair the harness between the diagnosis connector terminal and body earth.
- Check earthing line for open circuit and damage.
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- Use M.U.T.-III, perform CAN bus line diagnosis.
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Q.
Is the diagnosis code set?
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Check engine-ECU power supply system (Refer to ).
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Perform troubleshooting for CAN (Refer to GROUP 54C - Troubleshooting - CAN Bus Diagnostics Table ).
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