The automatic transmission ECU, fuel ECU, and ignition ECU are in the ECU box on the front right-hand side of the engine compartment, in front of the cooling system expansion tank. To remove the ECU make sure the ignition is off, wipe the top of the ECU box lid to avoid leaving dirt inside, release the catch on the side of the lid, and lift it off. Then, pull the locking lever on top of the ECU forwards and withdrawal from slot three of the box, nearest to the right-hand wheel arch. For refitting, find the ECU in the box, engaging it with the connector at the base of the ECU, push down the locking lever to secure it and refit the module box lid. If you are installing a new ECU, adapt the throttle position sensor signal by chocking up all four wheels and applying the handbrake. Start the engine, move selector lever to D (Drive) position, depressing brake pedal firmly, fully depress accelerator pedal for 5 seconds (to close the kickdown switch), then release the accelerator and move selector lever to P (Park) position, the new throttle position sensor signal is stored in the ECU memory. Finally, turn off the engine and take the wheel chocks away.