If I understand right. You have 12V at both pins on the injector connector? Are you measuring DC and from engine earth to connector (from valve cover bolts)? The injector gets power from a relay inside the ECU before start. When cranking/start the injectors also get 12V from the fuel pump relay (if it pulls). The ECU only puts the earth to the injector that should open. Earth to the injectors is taken from earth points on the intake manifold I think.
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urgant help needed with ABY not starter
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Originally posted by s0_big View PostIf I understand right. You have 12V at both pins on the injector connector? Are you measuring DC and from engine earth to connector (from valve cover bolts)? The injector gets power from a relay inside the ECU before start. When cranking/start the injectors also get 12V from the fuel pump relay (if it pulls). The ECU only puts the earth to the injector that should open. Earth to the injectors is taken from earth points on the intake manifold I think.
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Ok so iv looked at all the earths the engine all senders and the ecu are all earthed has they should. So just out of interest I put the volt meter on the signal from the hall sender and put to earth and I get 5v has soon has I turn the ignition on. So removed the pin from the plug and did it again and it’s 5vs coming out of the pin from the ecu. Now I know the ecu is a good one has iv just been and had it on another car and it starts and runs fine. So iv ruled that out. Correct me if I’m wrong but with the pin removed from the plug I shouldn’t be getting anything out of it.
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Ok so now iv managed to look at the wiring diagrams I see where iv been going wrong. So iv tester the ecu works on another car no problem at all. What iv changed for known working with no joys
fuse box
all the relays
hall sender
crank sender
starter motor
ignition switch
im getting kind of desperate now so any ideas would be helpful
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I know this may be a silly question as if it has you would have probably checked it out early doors but has the car got an alarm/immobiliser? I had a situation where my car would turn over but not start . I had power to the fuel pump but no spark, thought it was ignition switch so bridged two terminals on ecu ( can't remember which at the moment ) and away she went. Fitted new ignition switch and still the same. Turned out to be the immobiliser which was connected to three separate circuits, ignition, starter and fuel pump.
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Not sure what I am missing here, but the only difference between bump starting and key starting is the starter motor?Honda CBR 1100XX Blackbird Turbo....undergoing major changes.....
S2 Coupe... bit easier off the line...
'03 ZX12-R daily hack.... lots of nice bolt ons...
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Am I right in assuming that the ecu has to see up to 19 rpm from the G28 before starting but once running uses other sensors to stay running? If so do you think bump starting might show the ecu way more than the required rpm hence tricking the ecu into thinking the engine is running via the other senors ?
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