Inspection Procedure 1: Communication with the Column Switch (Column-ECU)
is not Possible.
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caution |
Whenever the ECU is replaced, ensure that the power
supply circuit, the earthing circuit and the communication circuit are
normal.
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COMMENTS ON TROUBLE SYMPTOM
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The power supply circuit to the column switch
(column-ECU) may be defective. If the wiring harness of the battery power
supply circuit for the ECU (column switch terminal No.1) is defective, also
check the power supply circuit to the ignition switch (IG1) (column switch
terminal No.9) and repair if necessary.
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- Malfunction of the ETACS-ECU
- Malfunction of the column switch
- Damaged harness wires and connectors
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STEP 1. ECU check by using the SWS monitor
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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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Go to Step 2.
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Refer
to Inspection Procedure 2 "Communication with the ETACS-ECU is not possible
."
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STEP 2. Connector check: D-311 column switch connector
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Q.
Is the check result normal?
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Go to Step 3.
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Repair
the defective connector.
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STEP 3. Voltage measurement at D-311 column switch
connector.
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(1)Remove the column switch, and measure at the wiring
harness side.
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(2)Voltage between D-311 column switch connector terminal
No.1 and body earth OK: System voltage
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Q.
Is the check result normal?
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Go to Step 5.
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Go to Step 4.
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STEP 4. Check the wiring harness between D-311 column switch connector
terminal No.1 and the fusible link (1).
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note |
Prior to the wiring harness inspection, check
intermediate connector D-241, and repair if necessary.
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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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STEP 5. Resistance measurement at the D-311 column switch
connector.
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(1)Remove the column switch, and measure at the wiring
harness side.
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(2)Resistance between D-311 column switch connector terminal
No.4 and body earth OK: Continuity exists (2 Ω or
less)
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Q.
Is the check result normal?
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Go to Step 7.
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Go to Step 6.
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STEP 6. Check the wiring harness between D-311 column switch connector
terminal No.4 and body earth.
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- Check the earth wires 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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STEP 7. Connector check: D-420 ETACS-ECU connector
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Q.
Is the check result normal?
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Go to Step 8.
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Repair
the defective connector.
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STEP 8. Check the wiring harness from D-420 ETACS-ECU connector
terminal Nos.59 and 68 to D-311 column switch connector terminal Nos.3 and
2.
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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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Go to Step 9.
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Repair
the wiring harness.
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STEP 9. ECU check by using the SWS monitor
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OK: "OK" is displayed on the
"COLUMN ECU" menu.
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Q.
Is the check result normal?
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Go to Step 10.
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Replace the column switch.
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STEP 10. Retest the system.
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Check that the ETACS-ECU communicates with the
column switch.
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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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Replace the ETACS-ECU.
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