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It is suspected that the power supply circuit to the front-ECU is defective, or the wiring harness between the SWS monitor and the front-ECU or their connector(s) is damaged. If the battery power supply circuit to the ECU (terminal No.7 of the front-ECU) is damaged, also check the power supply circuit from the ignition switch (IG2) (terminal No.30 of the front-ECU), and repair if necessary.
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- Malfunction of the front-ECU
- Malfunction of the ETACS-ECU
- Damaged harness wires and connectors
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Check that the power supply and earth lines to the ETACS-ECU and the SWS communication lines are normal.
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OK: "OK" is displayed on the "ETACS ECU" menu.
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Q.
Is the check result normal?
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Refer to Inspection Procedure 2 "Communication with the ETACS-ECU is not possible ."
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Q.
Is the check result normal?
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Repair the defective connector.
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(1)Remove the front-ECU, and measure at the relay box side.
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(2)Voltage between A-08X front-ECU connector terminal No.7 and body earth OK: System voltage
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Q.
Is the check result normal?
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- Check the power supply line for open circuit.
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Q.
Is the check result normal?
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The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use troubleshooting/Inspection Service Points ).
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Repair the wiring harness.
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Q.
Is the check result normal?
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Repair the defective connector.
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(1)Remove the front-ECU, and measure at the relay box side.
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(2)Turn the ignition switch to the ON position.
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(3)Voltage between A-09X front-ECU connector terminal No.30 and body earth OK: System voltage
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Q.
Is the check result normal?
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- Check the power supply line for open circuit.
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Q.
Is the check result normal?
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The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use troubleshooting/Inspection Service Points ).
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Repair the wiring harness.
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(1)Remove the front-ECU, and measure at the relay box side.
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(2)Resistance between A-09X front-ECU connector terminal No.31 and body earth OK: Continuity exists (2 Ω or less)
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Q.
Is the check result normal?
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- Check the earth wires for open and short circuit.
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Q.
Is the check result normal?
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The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use troubleshooting/Inspection Service Points ).
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Repair the wiring harness.
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Q.
Is the check result normal?
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Repair the defective connector.
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- Check the communication lines for open circuit.
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Q.
Is the check result normal?
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Repair the wiring harness.
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Check that the power supply and earth lines to the front-ECU and the SWS communication lines are normal.
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OK: "OK" is displayed on the "FRONT ECU" menu.
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Q.
Is the check result normal?
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The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use troubleshooting/Inspection Service Points ).
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