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Wiring, schematic, electrical diagrams, torq settings, parts info, error/fault codes, full asembly/dissembly, service instructions and a lot moreetc are basic contents of these online books they here on this website https://big-manuals.com/
Presumably you are referring to the engine management ECU rather than any of the other black box computers scattered around the vehicle?
It is usual for cars produced in the last few decades to be fitted with an immobiliser. If your car has an immobiliser you need to take advice from the dealer about whether the replacement ECU is ordered with your car's code already installed, whether it arrives with a random code requiring the security system to be recoded or whether the ECU arrives blank and the code is programmed into it as part of the fitting process.
If the vehicle is fitted with an immobiliser that could be the problem. Have you checked for a spark?
If an immobiliser is fitted the new engine ECU will have to be coded before it will work.
A wiring diagram is almost essential to diagnosing the problem. There is likely to be a relay controlling the supply to the fuel pump but what controls the relay? If the relay is controlled by the engine ECU there will be no supply until the immobiliser is disarmed.
If the vehicle was presented to me I would check for a spark and if a spark is present I would provide a temporary supply to the fuel pump to test if the engine starts, proving the fault is not immobiliser-related but a wiring or switching problem.
Immobiliser"s have been mandatory in all new cars sold in Germany since 1 January 1998, in the United Kingdom since 1 October 1998, in Finland since 1998, in Australia since 2001 and in Canada since 2007. Early models used a static code in the ignition key (or key fob) which was recognised by an RFID loop around the lock barrel and checked against the vehicle's Engine Control Unit (ECU) for a match. If the code is unrecognised, the ECU will not allow fuel to flow and ignition to take place. Later models use rolling codes or advanced cryptography to defeat copying of the code from the key or ECU. You do not state the year or your location. So see if you are in one of the areas above. The new style of Immobilizer is very hard to bypass. Make sure she is using the main key to try and start it. If the lock out is engaged the engine will spin but she will not fire. Is this what is happening? If the engine is not turning there may be a master cut off switch under the dash, I have installed one of these on my older car to save the battery, look for a large switch under the dash or seat. Look for a switch that looks out of place or out of the ordinary for the vehicle interior. Hope this Helps FixYa Up.
Immobilisers have been mandatory in all new cars sold in Germany since 1 January 1998, in the United Kingdom since 1 October 1998, in Finland since 1998, in Australia since 2001 and in Canada since 2007. Early models used a static code in the ignition key (or key fob) which was recognised by an RFID loop around the lock barrel and checked against the vehicle's Engine Control Unit (ECU) for a match. If the code is unrecognised, the ECU will not allow fuel to flow and ignition to take place. Later models use rolling codes or advanced cryptography to defeat copying of the code from the key or ECU. You do not say where you live. So have to be a bit generic. Hope this helps.
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