how to diagnose and fix the transmission jerking in my Volvo XC90

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a level surface and the parking brake is engaged.
• Disconnect the negative battery terminal to prevent any electrical issues.

2. Check and Replace Transmission Fluid

• Tools Required: Transmission fluid pump, funnel, fluid catch pan.
• Sub-steps:
  1. Place a fluid catch pan under the transmission pan.
  2. Remove the transmission fluid drain plug and let the old fluid drain completely.
  3. Replace the drain plug and tighten it to the manufacturer's specifications.
  4. Use a transmission fluid pump to add new transmission fluid through the dipstick tube until it reaches the proper level.
  5. Check the fluid condition and level once more after running the engine for a few minutes.

3. Inspect and Replace Transmission Mounts (if necessary)

• Tools Required: Socket set, jack stands.
• Sub-steps:
  1. Support the transmission with a jack and ensure it is secure.
  2. Remove the bolts securing the transmission mounts to the vehicle.
  3. Replace worn or damaged mounts with new ones.
  4. Reinstall the bolts and torque them to manufacturer specifications.

4. Inspect Throttle Position Sensor (TPS)

• Tools Required: Multimeter.
• Sub-steps:
  1. Locate the TPS on the throttle body.
  2. Disconnect the electrical connector.
  3. Use a multimeter to measure voltage output while moving the throttle.
  4. If the voltage readings are out of specifications, replace the TPS.

5. Clear Error Codes

• Use the OBD-II scanner to clear any error codes after repairs are completed.