how to troubleshoot and fix a misfiring engine in Tesla Model S Original (2012-2020)

Solution

1. Preparation

• Ensure the vehicle is parked on a flat surface and turn off the ignition.
• Disconnect the 12V battery for safety.
• Gather all necessary tools and parts.

2. Inspect High-Voltage Connections

• Sub-steps:
  • Remove the service panel to access the battery and drive unit.
  • Visually inspect all high-voltage connectors for corrosion, damage, or loose connections.
  • Clean any corrosion using a wire brush and apply dielectric grease to connectors before reassembly.

3. Check Drive Unit Components

• Sub-steps:
  • Inspect the drive unit for any signs of oil leaks or damage.
  • Remove any panels blocking access to the drive unit.
  • Use a multimeter to check the resistance and continuity of the drive unit windings.
  • If any abnormalities are found, consider replacing the drive unit.

4. Perform Battery Health Check

• Sub-steps:
  • Reconnect the 12V battery and access the vehicle's software diagnostics via the touchscreen.
  • Navigate to the battery settings and check for any alerts or warnings about battery health.
  • If the battery is out of acceptable limits, consider contacting Tesla service for a battery evaluation.

5. Reassemble and Test

• Sub-steps:
  • Reinstall any components or panels that were removed during the inspection.
  • Ensure all connections are tightened and secure.
  • Start the vehicle and monitor for any warning lights or abnormalities.