[54C] SMART WIRING SYSTEM (SWS) USING SWS MONITOR <Hong Kong spec.> - - SYMPTOM PROCEDURES - INSPECTION PROCEDURE A-3: Communication with the ETACS-ECU is not possible.PRINT PAGE / INDEX / PRIOR / NEXT
INSPECTION PROCEDURE A-3: Communication with the ETACS-ECU is not possible.
 CAUTION
 Whenever the ECU is replaced, ensure that the power supply circuit, the grounding circuit and the communication circuit are normal.
COMMENTS ON TROUBLE SYMPTOM
It is suspected that the power supply circuit to the ETACS-ECU is defective, or the wiring harness between the SWS monitor and the ETACS-ECU or their connector(s) is damaged. If the battery power supply circuit to the ECU (terminal No.20 of the ETACS-ECU) is damaged, also check the power supply circuit from the ignition switch (IG1) (terminal No.8 of the ETACS-ECU), and repair if necessary. If the earth circuit to the ECU (terminal No.3 of the ETACS-ECU) is defective, also check the earth circuit to the sensor (terminal No.56 of the ETACS-ECU), and repair if necessary.
POSSIBLE CAUSES
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
Step 1. Connector check: C-217 ETACS-ECU connector
Q: Is the check result normal?
YES:  Go to Step 2.
NO:  Repair the defective connector.
Step 2. Measure the voltage at the C-217 ETACS-ECU connector.
  1. Remove the ETACS-ECU, and measure at the junction block side.
  1. Voltage between C-217 ETACS-ECU connector terminal No.20 and body earth
    2. OK: Battery positive voltage
Q: Is the check result normal?
YES:  Go to Step 4.
NO:  Go to Step 3.
Step 3. Check the wiring harness between C-217 ETACS-ECU connector terminal No.20 and fusible link (1).
NOTE: Prior to the wiring harness inspection, check intermediate connectors A-14, C-125 and junction block connector C-204, and repair if necessary.
  • Check the power supply line for open circuit.
Q: Is the check result normal?
YES:  The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
NO:  Repair the wiring harness.
Step 4. Measure the resistance at the C-217 ETACS-ECU connector.
  1. Remove the ETACS-ECU, and measure at the junction block side.
  1. Continuity between C-217 ETACS-ECU connector terminal No.3 and body earth
    2. OK: 2Ω or less
Q: Is the check result normal?
YES:  Go to Step 6.
NO:  Go to Step 5.
Step 5. Check the wiring harness between C-217 ETACS-ECU connector terminal No.3 and body earth.
NOTE: Prior to the wiring harness inspection, check junction block connector C-205, and repair if necessary.
  • Check the earth wires for open circuit.
Q: Is the check result normal?
YES:  The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
NO:  Repair the wiring harness.
Step 6. Connector check: C-219 ETACS-ECU connector and C-310 column switch connector
Q: Is the check result normal?
YES:  Go to Step 7.
NO:  Repair the defective connector.
Step 7. Check the wiring harness from C-219 ETACS-ECU connector terminal Nos. 59 and 68 to C-310 column switch connector terminal Nos. 3 and 2.
NOTE: Prior to the wiring harness inspection, check joint connector C-02, and repair if necessary.
  • Check the communication lines for open circuit.
Q: Is the check result normal?
YES:  Go to Step 8.
NO:  Repair the wiring harness.
Step 8. ECU check on the SWS monitor
  • Ignition switch: OFF
ECUS TO BE CHECKED
  • ETACS
OK: "OK" is displayed on the "ETACS ECU" menu.
Q: Is the check result normal?
YES:  The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
NO:  Replace the ETACS-ECU.
[54C] SMART WIRING SYSTEM (SWS) USING SWS MONITOR <Hong Kong spec.> - - SYMPTOM PROCEDURES - INSPECTION PROCEDURE A-3: Communication with the ETACS-ECU is not possible.PRINT PAGE / INDEX / PRIOR / NEXT
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