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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 A-3 "Communication with the ETACS-ECU is not
possible ."
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![](../../../img/54/AC311521AB00ENG.png)
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Q.
Is the check result normal?
Go to Step
3.
Repair
the defective connector.
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![](../../../img/54/AC311521AB00ENG.png)
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(1)Disconnect the connector, and
measure at the relay box side. (2)Ignition switch:
ON
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![](../../../img/54/AC310507CJ00ENG.png)
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(3)Voltage between A-14X front-ECU
connector No.7 and body earth OK: System
voltage
Q.
Is the check result normal?
Go to Step
5.
Go to Step
4.
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![](../../../img/54/AC311521AB00ENG.png)
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- Check the power supply line for open
circuit.
Q.
Is the check result normal?
The trouble can be
an intermittent malfunction (Refer to GROUP 00 - How
to Cope with Intermittent Malfunction ).
Repair the wiring
harness.
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![](../../../img/54/AC311521AC00ENG.png)
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Q.
Is the check result normal?
Go to Step
6.
Repair
the defective connector.
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![](../../../img/54/AC311521AC00ENG.png)
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(1)Disconnect the connector, and
measure at the relay box side.
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![](../../../img/54/AC310506BV00ENG.png)
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(2)Resistance between A-15X
front-ECU connector terminal No.31 and body
earth OK: 2 Ω or less
Q.
Is the check result normal?
Go to Step
9.
Go to Step
7.
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![](../../../img/54/AC313371AC00ENG.png)
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Q.
Is the check result normal?
Go to Step
8.
Repair
the defective connector.
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![](../../../img/54/AC311521AC00ENG.png)
![](../../../img/54/AC313371AC00ENG.png)
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- Check the earth wires for open circuit.
Q.
Is the check result normal?
The trouble can be
an intermittent malfunction (Refer to GROUP 00 - How
to Cope with Intermittent Malfunction ).
Repair the wiring
harness.
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![](../../../img/54/AC313421AB00ENG.png)
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Q.
Is the check result normal?
Go to Step
10.
Repair
the defective connector.
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![](../../../img/54/AC313416AD00ENG.png)
![](../../../img/54/AC313414AD00ENG.png)
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note |
Prior to the wiring harness
inspection, check joint connector C-01 and
intermediate connector
C-125, and repair if necessary.
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- Check the communication lines for open
circuit.
Q.
Is the check result normal?
Go to Step
11.
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 Cope with Intermittent Malfunction ).
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