[54D] SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR <Except for Hong Kong spec.> - - DIAGNOSTIC TROUBLE CODE PROCEDURES - Diagnosis code 13: Trouble related to the front-ECU or improper connection with the ETACS-ECU | PRINT PAGE / INDEX / PRIOR / NEXT

Diagnosis code 13: Trouble related to the front-ECU or improper connection with the ETACS-ECU
| 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 If the front-ECU has sent abnormal signal to the ETACS-ECU for consecutively 15 communication cycles (0.6 second), the diagnosis code will be set. If the front-ECU has sent normal signal to the ETACS-ECU for consecutively 15 communication cycles (0.6 second), the ETACS-ECU will stop sending the diagnosis code.
| POSSIBLE CAUSES Malfunction of the front-ECU Malfunction of the ETACS-ECU Damaged harness wires and connectors
| DIAGNOSIS PROCEDURE
| Step 1. Use the MUT-II/III to confirm a diagnosis code. (MUT-II/III diagnosis code) Ignition switch: ON On completion, check that diagnosis code No.13 is not reset. Q: Is diagnosis code No.13 set? YES: Go to Step 5. NO: Go to Step 2.
| Step 2. Connector check: A-11X front-ECU connector Q: Is the check result normal? YES: Go to Step 3. NO: Repair the defective connector.
| Step 3. Measure the voltage at A-11X front-ECU connector. Remove the front-ECU, and measure at the relay box side. Voltage between A-11X front-ECU connector terminal No.5 and body earth OK: Battery positive voltage Q: Is the check result normal? YES: Replace the front-ECU. NO: Go to Step 4.
| Step 4. Check the wiring harness between A-11X front-ECU connector terminal No.5 and the battery. NOTE: <RH drive vehicles> Prior to the wiring harness inspection, check junction block connector C-202, intermediate connectors A-14 and joint connector C-02, 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 5. Connector check: A-12X front-ECU connector Q: Is the check result normal? YES: Go to Step 6. NO: Repair the defective connector.
| Step 6. Measure the resistance at A-12X front-ECU connector. Remove the front-ECU, and measure at the relay box side. Resistance between A-12X front-ECU connector terminal No.21 and body earth OK: 2 Ω or less Q: Is the check result normal? YES: Go to Step 8. NO: Go to Step 7.
| Step 7. Check the wiring harness between A-12X front-ECU connector terminal No.21 and the body earth. 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 8. Connector check: C-219 ETACS-ECU connector Q: Is the check result normal? YES: Go to Step 9. NO: Repair the defective connector.
| Step 9. Check the wiring harness between C-219 ETACS-ECU connector terminal No.59 and A-12X front-ECU connector terminal No.30. NOTE: Prior to the wiring harness inspection, check joint connector C-02 and intermediate connector C-116, and repair if necessary. Check the communication lines for open circuit. Q: Is the check result normal? YES: Go to Step 10. NO: Repair the wiring harness.
| Step 10. Check whether the diagnosis code is reset. Replace the column switch, and then check that the diagnosis code is not reset. Replace the column switch. Ignition switch: ON On completion, check that diagnosis code No.13 is not reset. Q: Is diagnosis code No.13 set? YES: Replace the ETACS-ECU. NO: The procedure is complete.

[54D] SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR <Except for Hong Kong spec.> - - DIAGNOSTIC TROUBLE CODE PROCEDURES - Diagnosis code 13: Trouble related to the front-ECU or improper connection with the ETACS-ECU | PRINT PAGE / INDEX / PRIOR / NEXT

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