Inspection Procedure 5: Gears cannot be shifted at all, or a certain gear shift (1st to 2nd, 2nd to 3rd, etc.) is not made.


PROBABLE CAUSES



  • Non-genuine device installation: A/T-ECU voltage drop
  • Improper fixing of the electric wiring, poor insertion of the connector, poor contact of the inside PIN
  • Poor adjustment of inhibitor switch
  • Failure of the inhibitor switch main unit
  • Malfunction of the A/T-ECU
  • A/T-ECU power supply or earth failure
  • A/T failure: Hydraulic system (valve body assembly), driving force transmission system (clutch/brake)

DIAGNOSIS PROCEDURE

STEP 1. Check the electrical equipment.

Q. Is the non-genuine electrical equipment (car navigator, audio devices, etc.) installed?
Remove the power supply wiring and signal lines of the equipment.
Go to Step 2

STEP 2. Check the electric system.
Check if there is an improper fixing of the electric wiring, poor insertion of the connector, and poor contact.

Q. Is the check result normal?
Go to Step 3.
Adjust and repair.

STEP 3. Check and adjust the inhibitor switch.
Refer to ,.
If the inhibitor switch has a failure, replace it, and then check the trouble symptom again.

Q. Is the check result normal?
The procedure is complete.
Go to Step 4.

STEP 4. Check the A/T-ECU power supply and earth.

Q. Is the check result normal?
Go to Step 5.
Repair the wiring.

STEP 5. Replace the A/T-ECU.

Q. Is the failure resolved?
The procedure is complete.
Go to Step 6.

STEP 6. Remove the transmission assembly from the vehicle.
Disassemble and check the transmission assembly to check if there is a foreign material inside.

Q. Is the check result satisfactory?
Replace the transmission assembly.
Replace the failure part.