Can anyone out there please offer an alternative source for the circuit diagram of an ECU manufactured by Mitsubishi in the early to mid 90's?
The PCB is in an ECU which controls a magnetic clutch ( which is also a Mitsubishi product ) on a Fiat car from 1993. Needless to say, Fiat have been of no help at all and Mitsubishi UK have ( so far ) failed to respond to any email contact.
The PCB has the Mitsubishi emblem followed by the designation G331B035B and has 18 pins. There is a similar but earlier version which has 17 pins.
Any assistance or pointers that can be given would be greatly appreciated.
Thank you. Pete.
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Anyone please?
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you have no chance in geting a diagram for a ecu
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Petel
As mentioned, the chances of you getting a circuit diagram are remote to nil. There is no need or demand for the manufacturer to issue this kind of detail on a circuit, and it would give the competition an easy ride.
The only accessible diagrams I have seen on the internet are for specialist hobbiest electronics like oscilloscopes - which are likely to be repaired by their users, i.e. unlike ECUs.
The only thing you can do is get your continuity tester out and find out where all the nets are and draw it out yourself. It'll take some time but if you're only looking at one part of the circuit then it could clarify things. There's nothing on a circuit diagram that doesn't appear on a PCB (hopefully!) so there's nothing stopping you drawing the physical in diagramatical form. A circuit diagram from the manufacturer will tell you only this anyway - it'll unlikely give you any clue about how to fix it, or what any IC pins do.
Most components are identifiable, and the only ones you will struggle with are the ICs and/or transistors, as these change quite readily and can be unique to an application. You might be lucky and find a datasheet on Google, but even where you can't you should be able to make an educated guess as to what pin's an input/output.
Having said you can make a start by making sure the resistors are present and correct (look out for parallels!). Capacitors as these are a common failure point on any ageing PCB, so replace those you can. The other possibility is a dry joint, so splodge some solder on the pins of the heaviest components and any that look suspicious and appear to have a thin dark concentric band through the solder.
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Many thanks for your time and consideration Mr Farrow. Your help is much appreciated.
Rgds.
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You should not use a battery or voltage driven continuity tester as any reverse voltage you create on the board could do more damage than you already have.There are companies that will repair/recondition ECU's look in exchange and mart for starters.
www.autotekelectronics.com/
www.ecuclinic.com/?gclid=CPC7uvjC9JUCFQNrMAodDAMlig
www.bluehawkelectronics.co.uk/
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