[54B] SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR <Hong Kong spec.> - - SYMPTOM PROCEDURES - TONE ALARM - INSPECTION PROCEDURE B-5: Downshift inhibitor buzzer does not work normally. <2000-5A/T> | PRINT PAGE / INDEX / PRIOR / NEXT

INSPECTION PROCEDURE B-5: Downshift inhibitor buzzer does not work normally. <2000-5A/T>
| CAUTION Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.
| COMMENTS ON TROUBLE SYMPTOM The downshift inhibitor buzzer (incorporated in the ETACS-ECU) will sound if the ETACS-ECU receives buzzer signal from the engine-A/T-ECU while the ignition switch (IG1) signal is on. If this function does not work normally, the input signal circuit from the engine-A/T-ECU, the engine-A/T-ECU itself or the ETACS-ECU may be defective.
| POSSIBLE CAUSES Malfunction of the door switches Malfunction of the engine-A/T-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. Check whether MPI and automatic transmission-related DTCs are set or not. Q: Is the check result normal? YES: Go to Step 2. NO: Refer to GROUP 13A - Troubleshooting <2000> or GROUP 13C - Troubleshooting <2400>. Or refer to GROUP 23A - Troubleshooting .
| Step 2. MUT-II/III actuator test Execute actuator test item number 15 (downshift inhibitor buzzer) (Refer to GROUP 23A - Troubleshooting ). OK: When actuator test item No.15 is executed, the downshift inhibitor buzzer sounds. 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: Go to Step 3.
| Step 3. Pulse check Check the input signal from the ignition switch (IG1).
System switch | Check conditions
--- | ---
Ignition switch (IG1) | When turned from ACC to ON
OK: The MUT-II/III sounds or the voltmeter needle fluctuates. Q: Is the check result normal? YES: Go to Step 4. NO: Refer to inspection procedure P-2 "The ignition switch (IG1) signal is not received" .
| Step 4. Connector check: C-109 engine-A/T-ECU connector Q: Is the check result normal? YES: Go to Step 5. NO: Repair the connector.
| Step 5. Check at the C-109 engine-A/T-ECU connector. Disconnect the connector, and check at the wiring harness side. Ignition switch: ON Connect C-109 engine-A/T-ECU connector terminal No.128 to body earth. OK: The ETACS-ECU buzzer sounds. Q: Is the check result normal? YES: Go to Step 9. NO: Go to Step 6.
| Step 6. Connector check: C-220 ETACS-ECU connector Q: Is the check result normal? YES: Go to Step 7. NO: Repair the connector.
| Step 7. Check the wiring harness between C-109 engine-A/T-ECU connector terminal No.128 and C-220 ETACS-ECU connector terminal No.43. NOTE: Prior to the wiring harness inspection, check intermediate connector C-106, 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 connector.
| Step 8. Retest the system. Q: Does the downshift inhibitor buzzer work normally? YES: The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ). NO: Replace the ETACS-ECU.
| Step 9. Retest the system. Check that the downshift inhibitor buzzer works normally. 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 engine-A/T-ECU.

[54B] SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR <Hong Kong spec.> - - SYMPTOM PROCEDURES - TONE ALARM - INSPECTION PROCEDURE B-5: Downshift inhibitor buzzer does not work normally. <2000-5A/T> | PRINT PAGE / INDEX / PRIOR / NEXT

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