why does my Toyota RAV4 Fourth Generation (2013-2018) check engine light come on when using the AC?

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to ensure safety while working on electrical components.

2. Addressing Error Codes

• Sub-step 1: Use the OBD-II scanner to retrieve and note down the error codes.
• Sub-step 2: Research the codes to determine the affected components (e.g., P0420 for catalytic converter efficiency).
• Sub-step 3: Clear the error codes and check for reoccurrence after repairs.

3. Inspecting and Replacing Components

• Sub-step 1: Inspect the serpentine belt for cracks or signs of wear. If damaged, replace it using a socket set.
  • Tools Required: Socket set, belt tensioner tool.
• Sub-step 2: If the AC compressor is faulty, remove it by disconnecting electrical connectors and refrigerant lines. Replace with a new compressor.
  • Tools Required: Wrench set, AC manifold gauge set.
• Sub-step 3: Clean or replace the throttle body and idle air control valve if they are dirty or malfunctioning.
  • Tools Required: Throttle body cleaner, screwdriver set.

4. Recharging AC System

• Sub-step 1: If refrigerant levels are low, use an AC manifold gauge to check the pressures.
• Sub-step 2: Recharge the system with the appropriate type of refrigerant (e.g., R-134a) as specified by the manufacturer.
  • Tools Required: AC recharge kit.
• Sub-step 3: Test the AC system to ensure it is cooling properly and that the check engine light remains off.