Hard shifting solution Corolla

Hard Shifting Solution for Toyota Corolla E170 (2013-2019)

Tools Required:

• OBD-II Scanner
• Transmission Fluid Dipstick (if applicable)
• Basic Hand Tools: Screwdrivers, Wrenches
• Multimeter
• Transmission Jack (if needed)
• Digital Thermometer

Step-by-Step Diagnosis:

1. Check for OBD-II Trouble Codes:

   • Connect the OBD-II scanner to the vehicle’s diagnostic port.
   • Retrieve any stored trouble codes related to the transmission (e.g., P0700, P0715).
   • Note any specific codes for further troubleshooting.

2. Inspect Transmission Fluid:

   • Ensure the vehicle is on a level surface and warmed up to normal operating temperature.
   • Check the transmission fluid level using the dipstick (if equipped).
   • Inspect the fluid color and smell: it should be a clear red and not burnt or dark brown.
   • If low, refill with the appropriate type of transmission fluid (Toyota WS ATF).
   • If fluid is burnt or contaminated, plan for a fluid change or flush.

3. Check Transmission Fluid Temperature:

   • Use a digital thermometer to measure the fluid temperature.
   • Ensure it is within the operating range specified in the vehicle’s service manual.

4. Inspect Transmission Control Module (TCM):

   • Verify the TCM connections are secure and free from corrosion.
   • Use a multimeter to check power and ground connections to the TCM.

5. Inspect Transmission Wiring and Connectors:

   • Visually inspect wiring harnesses for any damage or corrosion.
   • Pay special attention to the wiring near the transmission and connectors.

6. Check Solenoids and Sensors:

   • Using the OBD-II scanner, perform a live data analysis of transmission solenoid operations.
   • Test the transmission speed sensors and pressure control solenoids for proper functionality using a multimeter.

Repair Instructions:

Tools Required:

• Socket Set
• Torque Wrench
• Replacement Parts (if needed, such as solenoids or sensors)
• Transmission Fluid Funnel

1. Replace Transmission Fluid and Filter:

   • Drain the old transmission fluid by removing the drain plug.
   • Replace the transmission fluid filter.
   • Refill with new Toyota WS ATF as per specifications.

2. Replace Faulty Solenoids (if diagnosed):

   • Remove the transmission pan to access solenoids.
   • Disconnect the electrical connectors and remove the retaining bolts.
   • Install new solenoids and reassemble in reverse order.

3. Repair or Replace Damaged Wiring:

   • Repair any frayed or damaged wires using heat shrink tubing and solder.
   • Replace connectors if corrosion is present.

4. Reprogram or Replace TCM (if necessary):

   • If TCM is diagnosed faulty, reprogram or replace it as per Toyota’s guidelines.
   • Reprogramming may require specialized dealership tools or software.

5. Test Drive and Recheck:

   • After repairs, perform a test drive to ensure the problem is resolved.
   • Recheck the fluid levels and ensure there are no leaks.

Conclusion:

By following these steps, you should be able to diagnose and repair the hard shifting issue in a Toyota Corolla E170. If the problem persists, consider consulting a professional transmission specialist or a Toyota dealership for further evaluation.