Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

2012 Toyota Avalon BaseFACTORY OEM SERVICE PROCEDURE

Engine Control System (Service Information): ECM: Removal: Removal

DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
NOTE:
If the cable is disconnected, some systems need to be initialized after the cable is reconnected. Refer to INITIALIZATION .
REMOVE WINDSHIELD WIPER ARM AND BLADE ASSEMBLY LH . Refer to REMOVAL - Step 1 .
REMOVE WINDSHIELD WIPER ARM AND BLADE ASSEMBLY RH . Refer to REMOVAL - Step 2 .
REMOVE COWL TOP VENTILATOR LOUVER SUB-ASSEMBLY . Refer to REMOVAL - Step 3 .
REMOVE WINDSHIELD WIPER MOTOR AND LINK ASSEMBLY . Refer to REMOVAL - Step 4 .
REMOVE COWL TOP PANEL OUTER . Refer to REMOVAL - Step 5 .
REMOVE ECM
1. Remove the 3 nuts.
  
  Fig 1: Locating ECM Nuts
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Separate the ECM from the body.
  
  Fig 2: Separating ECM From Body
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.