Engine ECU
Engine ECU
The ECU (Electronic Control Unit) for the UZZ32 is very similar (but apparently different) to that from the UZZ31 Soarer. The engine will not run without an ECU, and if the ECU is bad it may not run properly. Capacitors in the ECU deteriate over time but can be replaced as long as the leaking chemicals have not caused irrepairable damage to the circuit boards.
ECU location
The ECU is located on the passenger side floor.
ECU Removal
To access it, remove the carpet. Be aware that the carpet has both a firm foam backing (which will tend to break if the carpet is folded) as well as various integrated pieces of hard plast used to assist in mounting. This means that the carpet will not fold easily, and/or that if it does fold, the softer carpet material may tear. In addition, the plastic pieces at the back of the carpet may scratch you and/or the other pieces of the trim.
The ECU is also covered by a black plastic "shield", which is held in place by two nuts.
There is a clip-on cover that provides further protection to the cables.
There are 3 x 40-pin cable harnesses entering the ECU.
- The right-hand side one "just" pulls out.
- The other two require the undoing of a screw (which is likely hidden from view under the cables)
There are two screws on the side of the ECU that secure it to the mounting bracket, but it is easier to remove the bracket AND ECU, and then separate the ECU if necessary.
The ECU mounting plate is then held in place by two further nuts as well as a "fold" in the metal that hooks into a corresponding bracket. Lift the rear of the ECU (the side facing you) up about 30 degrees so that it unhooks from the part that is further forward in the footwell.