We have a toyota prado 2002 we imported to southern africa from Japan. During shipment, the engine control unit (ECU) was stolen. We purchased a used ECU but it cannot communicate with the master key and we don't have the code. If we buy a new computer and new transponder - will they communicate? Do we need the code for the old computer?

It isn't a fusible item, it is a function of the Engine Control Module. You need an auto electrician for issues and to diagnose faults.

https://fuse-box.info/toyota/toyota-camry-xv30-2002-2006-fuses-and-relay

2002 Toyota Camry 2.4L - ECM ECU PCM ' 89661-3T171

Flagship One https://www.fs1inc.com > 89661-3t171-2002-toyota-c...

This Engine Computer also referred to as an Engine Control Module (ECM), Engine Control Unit (ECU) & Powertrain Control Module (PCM)

..

The Engine Control Module (ECM) on a 1990 Toyota pickup with a 3.0L V6 engine is typically located in the engine compartment, near the firewall on the driver's side. It may be mounted on the inner fender, near the battery or behind the air cleaner assembly. It is a rectangular black box with connectors on one end and it should have the letters "ECM" or "ECU" written on it. It's also important to note that on a 1990 Toyota truck it is also called the Engine Control Unit (ECU) and both ECM and ECU are interchangeable.

Prado?
did you mean
Toyota Land Cruiser Prado no year told (1985 to now 2022+) vast years made!!!!
no engine told ,not even gas (petrol) or diesel (28 total) OMG lots.!
engine size not told so there is no answer possible.
on Petrol the ECU/PCM modulates injectors.
diesel is many answers for 37 years, may diesel pumps or diesel ECU.

so hard to say:
Toyota Land Cruiser Prado is the head end AV day ONE, 2003 original ?
ask them (toyota) or Panasonic
I bet Panasonic sends you to TOYOTA. (sub licensee)
there are 4 kinds of head ends made,
1: universal , many lang.
2: only works in Japan
3: or only works in country X
there are only 2 ways to know this.
1: ask them (maker of head end AV or ask car maker)
2: find the settings, for LANG, if not there ,it is not there.
the cure is , if lucky
there is a firmware update to fix that. ask them and we are NOT THEM. I as talk top TOYATA the name you never said.
ask here
https://www.cars-directory.net/problem-solving/toyota/voxy/5122.html

Hello Susan,

Your check engine light is located in your vehicles dash cluster and will only illuminate when a fault is detected..no detected faults..no light, although it should illuminate (to prove it is working) for a short period of time at each engine start up.

If your light does not confirm operation during the start cycle, explore for access to the lights wiring connector behind the instrument panel cluster to see if you can easily remove the lamp from the cluster...sometimes it it easier to remove the dash trim bezels and remove the cluster from the dash to change lamps.

Of course your Toyota's engine management systems are controlled by an computer generally referred to as a ECM (engine control unit (ECU), also commonly called an engine control module) so if your lamp fails to illuminate during the start cycle the problem may not be due to a simple lamp failure.

you have to bring your car in toyota to set the program of the ECU

if the thermostat is ok, then i cannot see why it would be a problem

that said, i would accept the advice of local mechanics out there and remove it if they think it may be a problem. a car without a thermostat takes a little longer to warm up. that should not be a issue in southern africa...

The chiltons manual says. Short circuit in check connector terminal T with the air conditioning switch ON or throttle switch (IDL) contact point OFF - defective ac switch, Throttle Position Sensor (TPS) circuit, or Electronic Controle Unit (ECU) if that helps

yes it is true .........but make sure the cooling fan cuts in and out as well as the proper function of the temperature hand if equiped with one.Hope this helps.

i need onwer's manual of toyota prado 2005 3.4L