[54E] SMART WIRING SYSTEM (SWS) USING SWS MONITOR <Except for Hong Kong spec.> - - SYMPTOM PROCEDURES - INSPECTION PROCEDURE A-1: Communication with the SWS monitor is not possible. | PRINT PAGE / INDEX / PRIOR / NEXT

SYMPTOM PROCEDURES

INSPECTION PROCEDURE A-1: Communication with the SWS monitor 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 The SWS monitor may be connected improperly.
| POSSIBLE CAUSES Malfunction of the SWS monitor body (I/F cartridge) Malfunction of the SWS monitor harness Malfunction of the ETACS-ECU Damaged harness wires and connectors
| DIAGNOSIS PROCEDURE
| Step 1. Check that the MUT-II/III communicates with the other systems. Use the MUT-II/III to confirm that it communicates with the other systems. Q: Is the check result normal? YES: Go to Step 2. NO: Diagnose the engine control system. Refer to <4G64> or <4G69>.
| Step 2. Check the MUT-II/III power supply system. When the ignition switch is turned ON, check if the MUT-II/III can communicate with the system. Q: Is the check result normal? YES: Refer to Inspection Procedure A-3 "Communication with ETACS-ECU is not possible ." NO: Go to Step 3.
| Step 3. Connector check: C-219 ETACS-ECU connector Q: Is the check result normal? YES: Go to Step 4. NO: Repair the defective connector.
| Step 4. Measure the resistance at the C-219 ETACS-ECU connector. Disconnect the connector, and measure at the junction block side. Resistance between C-219 ETACS-ECU connector terminal No.56 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-219 ETACS-ECU connector terminal No.56 and body earth. Check the earth wires for open circuit. Q: Are the check results 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-24 diagnosis 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.51 and 67 to C-24 diagnosis connector terminal Nos.9 and 1. Check the communication lines for open circuit. Q: Are the check results normal? YES: Replace the ETACS-ECU. NO: Repair the wiring harness.

[54E] SMART WIRING SYSTEM (SWS) USING SWS MONITOR <Except for Hong Kong spec.> - - SYMPTOM PROCEDURES - INSPECTION PROCEDURE A-1: Communication with the SWS monitor is not possible. | PRINT PAGE / INDEX / PRIOR / NEXT

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