How to Remove ECU on 1995-1999 4thgen Nissan Maxima

Community Member Credit: CS_AR

Here’s a slide show I pulled together this morning after I removed the ECU from my 99 Maxima. I read some ECU removal instructions and was able to remove the ECU in about 20 minutes or less.

While I purchased a new Offset Ratchet Screwdriver Tool with a #2 Phillips, once I started the job, I quickly realized my existing 8mm Swivel Head Gear Wrench would stay mounted on the ECU bracket bolts and make the removal go faster.

Step 1 – Disconnect Battery

Step 2 – Remove ECU Covers

Step 3 – Remove ECU Wiring Harness

Step 4 – Remove Left Side ECU Mounting Bracket Bolts

Step 5 – Remove Right Side ECU Mounting Bracket Bolts

Step 6 – Lower ECU Away From Mounting Bracket

Step 7 – Remove ECU