Code No.02 Communication Error with Column Switch




















caution If diagnosis code No.02 is set in the ETACS-ECU, diagnose the CAN bus lines.
note When the diagnosis codes relating to the CAN communication error are set, make sure of the vehicle equipment. When the vehicle is not equipped with the system the SWS communicates to, the diagnosis code is always set. This is not abnormal.

TROUBLE JUDGMENT
The ETACS-ECU communicates with the column switch through the SWS communication lines. If there is any trouble in that communication, diagnosis code No.02 will be set.

COMMENT ON TROUBLE SYMPTOM
The column switch, the ETACS-ECU, connector(s), or wiring harness between the two may be defective.

PROBABLE CAUSES

  • Malfunction of the lighting switch
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54D - Troubleshooting ).

STEP 2. M.U.T.-III diagnosis code
(1)Erase the diagnosis code.
(2)Ignition switch: LOCK (OFF) position to ON
(3)On completion, check that diagnosis code No.02 is not reset.

Q. Is diagnosis code No.02 set?
Go to Step 3.
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use troubleshooting/Inspection Service Points ).

STEP 3. Connector check: D-311 column switch connector

Q. Is the check result normal?
Go to Step 4.
Repair the defective connector.

STEP 4. Voltage measurement at D-311 column switch connector.
(1)Remove the column switch connector, and measure at the wiring harness side.
(2)Voltage between D-311 column switch connector terminal No.1 and body earth
OK: System voltage

Q. Is the check result normal?
Go to Step 6.
Go to Step 5.

STEP 5. Check the wiring harness between D-311 column switch connector terminal No.1 and the fusible link (1).
note Prior to the wiring harness inspection, check intermediate connector D-241, and repair if necessary.

  • Check the power supply line for open and short circuit.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use troubleshooting/Inspection Service Points ).
Repair the wiring harness.

STEP 6. Voltage measurement at D-311 column switch connector.
(1)Remove the column switch connector, and measure at the wiring harness side.
(2)Ignition switch: ON
(3)Voltage between D-311 column switch connector terminal No.9 and body earth
OK: System voltage

Q. Is the check result normal?
Go to Step 8.
Go to Step 7.

STEP 7. Check the wiring harness between D-311 column switch connector terminal No.9 and the ignition switch (IG1).
note Prior to the wiring harness inspection, check junction block connectors D-403 and D-405, and repair if necessary.

  • 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 use troubleshooting/Inspection Service Points ).
Repair the wiring harness.

STEP 8. Resistance measurement at the D-311 column switch connector.
(1)Remove the column switch connector, and measure at the wiring harness side.
(2)Resistance between D-311 column switch connector terminal No.4 and body earth
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?
Go to Step 10.
Go to Step 9.

STEP 9. Check the wiring harness between D-311 column switch connector terminal No.4 and body earth.

  • 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 use troubleshooting/Inspection Service Points ).
Repair the wiring harness.

STEP 10. Connector check: D-420 ETACS-ECU connector

Q. Is the check result normal?
Go to Step 11.
Repair the defective connector.

STEP 11. 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.

  • Check the communication lines for open circuit.

Q. Is the check result normal?
Go to Step 12.
Repair the wiring harness.

STEP 12. Check whether the diagnosis code is reset.
Replace the lighting switch, and then check that the diagnosis code is not reset to the ETACS-ECU.
(1)Replace the lighting switch.
(2)Erase the diagnosis code.
(3)Ignition switch: LOCK (OFF) position to ON
(4)On completion, check that diagnosis code No.02 is not reset.

Q. Is diagnosis code No.02 set?
Replace the ETACS-ECU.
The procedure is complete.