Diagnosis code 13: Trouble related to the front-ECU or improper connection with the ETACS-ECU

[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

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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.

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