[54E] SMART WIRING SYSTEM (SWS) USING SWS MONITOR <Except for 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.
| TROUBLESHOOTING HINTS 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. Remove the ETACS-ECU, and measure at the junction block side. Voltage between C-217 ETACS-ECU connector terminal No.20 and body earth 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 battery. NOTE: Prior to the wiring harness inspection, check intermediate connector C-116 <RH drive vehicle>, joint connector C-02 and junction block connector C-202 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. Remove the ETACS-ECU, and measure at the junction block side. Resistance between C-217 ETACS-ECU connector terminal No.3 and body earth OK: 2 Ω 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 by using the SWS monitor Ignition switch: OFF ECU TO BE CHECKED ETACS ECU 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.

[54E] SMART WIRING SYSTEM (SWS) USING SWS MONITOR <Except for 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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