[23A] AUTOMATIC TRANSMISSION (FF) - - TROUBLESHOOTING <A/T> - SYMPTOM PROCEDURES - Inspection Procedure 18: Steering shift switch system <5A/T> | PRINT PAGE / INDEX / PRIOR / NEXT

Inspection Procedure 18: Steering shift switch system <5A/T>
OPERATION The steering shift switch detects the shift range (sport mode) which the driver has selected, and sends the information to the engine-A/T-ECU.
COMMENTS ON TROUBLE SYMPTOM The cause is probably a malfunction of the steering shift switch circuit and engine-A/T-ECU.
PROBABLE CAUSES Malfunction of steering shift switch Malfunction of the clock spring Damaged harness wires and connectors Malfunction of the engine-A/T-ECU
DIAGNOSIS PROCEDURE
STEP 1. MUT-II/III data list Item 70: Steering shift switch (Refer to data list reference table). Q: Is the check result normal? YES: Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ). NO: Go to Step 2.
STEP 2. Connector check: C-312 steering shift switch connector Check for the contact with terminals. Q: Is the check result normal? YES: Go to Step 3. NO: Repair the defective connector.
STEP 3. Check the steering shift switch. Refer to . Q: Is the check result normal? YES: Go to Step 4. NO: Replace the steering shift switch.
STEP 4. Check the clock spring. Remove the clock spring. Check the continuity between connector C-309 terminal No. 1 and connector C-308 terminal No. 6. Check the continuity between connector C-309 terminal No. 3 and connector C-308 terminal No. 4. OK: Continuity Q: Is the check result normal? YES: Go to Step 5. NO: Replace the clock spring.
STEP 5. Measure the voltage at steering shift switch connector C-312. Disconnect the connector, and measure the voltage between terminal 2 and earth at the wiring harness side. Turn the ignition switch to the ON position. OK: 4.9 - 5.1 V Q: Is the check result normal? YES: Go to Step 6. NO: Go to Step 9.
STEP 6. Measure the resistance at steering shift switch connector C-312. Disconnect the connector, and measure the resistance between terminal 1 and earth at the wiring harness side. Turn the ignition switch to the ON position. OK: 2 Ω or less Q: Is the check result normal? YES: Go to Step 14. NO: Go to Step 7.
STEP 7. Connectors check:C-111 engine-A/T-ECU connector, C-105 intermediate connector , C-308, C-309 clock spring connector Check for the contact with terminals. Q: Is the check result normal? YES: Go to Step 8. NO: Repair the defective connector.
STEP 8. Check the wiring harness between steering shift switch connector C-312 terminal No.1 and engine-A/T-ECU connector C-111 terminal No.57. Check the earth line for open circuit. Q: Is the check result normal? YES: Go to Step 14. NO: Repair the wiring harness.
STEP 9. Measure at the C-109 engine-A/T-ECU connector. Measure the voltage between engine-A/T-ECU connector terminal No.125 and earth. Turn the ignition switch to the ON position. OK: 4.9 - 5.1 V Q: Is the check result normal? YES: Go to Step 10. NO: Go to Step 11.
STEP 10. Connectors check: C-109 engine-A/T-ECU connector, C-104 intermediate connector, C-308, C-309 clock spring connector Check for the contact with terminals. Q: Is the check result normal? YES: Go to Step 11. NO: Repair the defective connector.
STEP 11. Check the harness between steering shift switch connector C-312 terminal No.2 and engine-A/T-ECU connector C-109 terminal No.125. Check the power supply line for open circuit. Q: Is the check result normal? YES: Go to Step 14. NO: Repair
STEP 12. Connectors check: C-109 engine-A/T-ECU connector, C-104 intermediate connector, C-308, C-309 clock spring connector Check for the contact with terminals. Q: Is the check result normal? YES: Go to Step 13. NO: Repair the defective connector.
STEP 13. Check the harness between steering shift switch connector C-312 terminal No.2 and engine-A/T-ECU connector C-109 terminal No.125. Check the power supply line for short circuit. Q: Is the check result normal? YES: Go to Step 14. NO: Repair the wiring harness.
STEP 14. MUT-II/III data list Item 70: Steering shift switch (Refer to data list reference table ). Q: Is the check result normal? YES: Check for the intermittent malfunction. (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).) NO: Replace the engine-A/T-ECU.

[23A] AUTOMATIC TRANSMISSION (FF) - - TROUBLESHOOTING <A/T> - SYMPTOM PROCEDURES - Inspection Procedure 18: Steering shift switch system <5A/T> | PRINT PAGE / INDEX / PRIOR / NEXT

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