[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.
  1. Remove the clock spring.
  1. Check the continuity between connector C-309 terminal No. 1 and connector C-308 terminal No. 6.
  1. Check the continuity between connector C-309 terminal No. 3 and connector C-308 terminal No. 4.
    2. 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.
  1. Disconnect the connector, and measure the voltage between terminal 2 and earth at the wiring harness side.
  1. Turn the ignition switch to the ON position.
    2. 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.
  1. Disconnect the connector, and measure the resistance between terminal 1 and earth at the wiring harness side.
  1. Turn the ignition switch to the ON position.
    2. 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.
  1. Measure the voltage between engine-A/T-ECU connector terminal No.125 and earth.
  1. Turn the ignition switch to the ON position.
    2. 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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