G35 Coupe Engine Control Unit (ECU) REMOVAL / RE-INSTALL

Tools require for ECU removal and re-installing.

1. 10 mm socket and ratchet (or equivalent)
2. Philip (cross) screw driver
3. Flat head screw driver
4. Need Nose Pliers

Before you start lower your driver and passenger side window down about 1-2 inches. You can lower it more, but at the very minimum 1-2 inches. This is done so when you disconnect your battery the doors will open smoothly.

Start by disconnecting the battery by removing the negative terminal using the 10 mm socket.

Next open up the passenger side door and remove the floor/doortrim by gently pulling upwards. Start from the rear and work towards the front.

Find the plastic nut that holds the side kick panel. Remove it by turning counter-clockwise. No tools are needed. It's not on very tight. Put all loose hardware (nuts, bolts) into the tray behind the shifter.

Use the flat head screw driver (if need) and pry the front edge of theside kick panel outwards (towards the driver side) and remove the panel. Be careful of where you put the screwdriver. It CAN break the plastic.

Locate the screw behind the kick panel and one next to the lower vent (by left feet) Use the philips (cross) screwdriver to remove it

Remove the bottom undercover. It is snap in, so just pull down on it and pull out.

Drop the glove box down and remove the 4 screws and locking retainer

Start from the lower right corner of the G35 Glove box and gently pull outwards. Work your way around till the glove box comes down. You can leave all plugs/connectors hooked up.

Look up underneath the dash and you will see the G35 ECU. Disconnect the harness from the ECU by squeezing the tab together and gently pull it down and over.

There are now 2 more nuts remaining until the ECU comes out. Look up towards the ECU and you will see a 10mm nut and another one towards the firewall. Remove them and put the nuts in the tray behind the shifter.

Get the pliers and squeeze the tab and pull out. This will release the wiring harness away from the ECU bracket assembly.

The ECM should come down easily with the bracket. Remove the bracket from the ECM and put all the nuts back onto the bracket. The ECM is now ready to be sent in for Flash Programming.

These are all the parts you should have left over for the removal of the ECM.

Installation is in the reverse order. After the ECU and all panels are installed, follow our "ECU Resetting Procedures".