Inspection Procedure 17: Shift switch assembly system

OPERATION

The shift switch assembly 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 shift switch and engine-A/T-ECU.

PROBABLE CAUSES

Malfunction of shift switch assembly
Damaged harness wires and connectors
Malfunction of the engine-A/T-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list

Item 61: Inhibitor switch (Refer to data list reference table ).

Q. Is the check result normal?

	Go to Step 2.

	Refer to Inspection procedure 16: Inhibitor switch system .

STEP 2. M.U.T.-III data list

Item 67: Select switch
Item 68: Upshift switch
Item 69: Downshift switch

Check the above data list (Refer to data list reference table

Q. Is the check result normal?

	Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).

	NO <"NG" for all items> : Go to Step 3.

	NO <"NG" for items 68 and 69> : Go to Step 5.

	NO <"NG" for item 67> : Go to Step 10.

	NO <"NG" for item 68> : Go to Step 17.

	NO <"NG" for item 69> : Go to Step 20.

STEP 3. Connectors check: C-121 shift switch assembly connector, C-112 engine-A/T-ECU connector, C-17 intermediate connector

Check for the contact with terminals.

Q. Is the check result normal?

Go to Step 4.

Repair the defective connector.

STEP 4. M.U.T.-III data list

Item 67: Select switch
Item 68: Upshift switch
Item 69: Downshift switch

Check the above data list (Refer to data list reference table

Q. Is the check result normal?

	Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).

	Replace the engine-A/T-ECU.

STEP 5. Check the shift switch assembly.

Refer to

Q. Is the check result normal?

	Go to Step 6.

	Replace the shift switch assembly.

STEP 6. Connector check: C-121 shift switch assembly connector

Check for the contact with terminals.

Q. Is the check result normal?

Go to Step 7.

Repair the defective connector.

STEP 7. Measure the voltage at shift switch assembly connector C-121

(1)Disconnect the connector, and measure the voltage between terminal 3 and earth at the wiring harness side.
(2)Ignition switch: ON
OK: System voltage

Q. Is the check result normal?

Go to Step 4.

Go to Step 8.

STEP 8. Connectors check: C-203 J/B connector, C-51 J/C (13) <Vehicle for Hong Kong and Singapore>

Check for the contact with terminals.

Q. Is the check result normal?

Go to Step 9.

Repair the defective connector.

STEP 9. Check the harness between shift switch assembly connector C-121 terminal No.3 and J/B connector C-203 terminal No.12.

Check the power supply line for short or open circuit.

Q. Is the check result normal?

Go to Step 4.

Repair the wiring harness.

STEP 10. Check the shift switch assembly.

Refer to

Q. Is the check result normal?

	Go to Step 11.

	Replace the shift switch assembly.

STEP 11. Connector check: C-121 shift switch assembly connector

Check for the contact with terminals.

Q. Is the check result normal?

Go to Step 12.

Repair the defective connector.

STEP 12. Measure the voltage at shift switch assembly connector C-121

(1)Disconnect the connector, and measure the voltage between terminal 1 and earth at the wiring harness side.
(2)Selector lever position: D
(3)Ignition switch: ON
OK: System voltage

Q. Is the check result normal?

Go to Step 13.

Go to Step 15.

STEP 13. Connectors check: C-112 engine-A/T-ECU connector

Check for the contact with terminals.

Q. Is the check result normal?

Go to Step 14.

Repair the defective connector.

STEP 14. Check the harness between shift switch assembly connector C-121 terminal No.4 and engine-A/T-ECU connector C-112 terminal No.85.

Check the output line for short-circuited or open circuit.

Q. Is the check result normal?

Go to Step 4.

Repair the wiring harness.

STEP 15. Connector check: C-17 intermediate connector

Check for the contact with terminals.

Q. Is the check result normal?

Go to Step 16.

Repair the defective connector.

STEP 16. Check the harness between shift switch assembly connector C-121 terminal No.1 and inhibitor switch connector B-111 terminal No.1.

Check the power supply line for short or open circuit.

Q. Is the check result normal?

Go to Step 4.

Repair the wiring harness.

STEP 17. Check the shift switch assembly.

Refer to

Q. Is the check result normal?

	Go to Step 18.

	Replace the shift switch assembly.

STEP 18. Connectors check: C-121 shift switch assembly connector, C-112 engine-A/T-ECU connector, C-17 intermediate connector

Check for the contact with terminals.

Q. Is the check result normal?

Go to Step 19.

Repair the defective connector.

STEP 19. Check the harness between shift switch assembly connector C-121 terminal No.6 and engine-A/T-ECU connector C-112 terminal No.77.

Check the output line for short-circuited or open circuit.

Q. Is the check result normal?

Go to Step 4.

Repair the wiring harness.

STEP 20. Check the shift switch assembly.

Refer to

Q. Is the check result normal?

	Go to Step 21.

	Replace the shift switch assembly.

STEP 21. Connectors check: C-121 shift switch assembly connector, C-112 engine-A/T-ECU connector, C-17 intermediate connector

Check for the contact with terminals.

Q. Is the check result normal?

Go to Step 22.

Repair the defective connector.

STEP 22. Check the harness between shift switch assembly connector C-121 terminal No.5 and engine-A/T-ECU connector C-112 terminal No.68.

Check the output line for short-circuited or open circuit.

Q. Is the check result normal?

Go to Step 4.

Repair the wiring harness.