| [ Total Views: 2414 | Total Replies: 61 | Thread Id: 105559 ] |
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 matberry
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| posted on April 2nd, 2014 at 10:04 PM |
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Good info ^^ but I'll add the aux air reg has a heating element that closes the air passage as the engine heats up. It allows extra air whilst cold
and over a few minutes (depnding on ambient) closes it off.
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 vlad01
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| posted on April 3rd, 2014 at 08:09 AM |
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the aux air valve from my understanding is to allow more air during cold idle? its pretty old tech.
the resistor pack is there not to fry the injector drivers int he ECU as they are used on some older systems in conjunction with low Z injectors.
Pretty much all cars use high Z injectors and don't need the resistors.
If there is no injector pulse you might want to check the trigger input from the coil to the ECU. That is how the ECU knows the engine speed and when
to fire the injectors. Without that the ECU does nothing.
also there is no TPS, weird system ! the D jet does and its older. I wonder how it calculates engine load?
71 notchback,
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ancientbugger
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| posted on April 3rd, 2014 at 09:51 AM |
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The ecu does get the 'trigger pulse' from the coil just no pulse at the injectors. That's why I'm thinking the ECU.
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vlad01
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| posted on April 3rd, 2014 at 11:28 AM |
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was the injector plugs constantly on or off? when you tested them
71 notchback,
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psimitar
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| posted on April 3rd, 2014 at 06:19 PM |
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Well if all the relevant inputs are working and power is getting thru the dual relay where it needs to go then gotta be the ECU.
Oh, thinking about it. Does the relay output for the ECU power work?
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ancientbugger
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| posted on April 3rd, 2014 at 06:43 PM |
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The injector plugs were live (on) and the relay...I can't remember ,when I put the loom back in I'll check
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vlad01
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| posted on April 3rd, 2014 at 09:29 PM |
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So where the injectors fully open and spraying without the engine turning? Considering it was live?
71 notchback,
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psimitar
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| posted on April 3rd, 2014 at 11:23 PM |
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No silly Vlad 
The multimeter will just show 12v at the injector but without the ECU grounding the injector they won't be on. Well, least ways they shouldn't 
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vlad01
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| posted on April 4th, 2014 at 08:36 AM |
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The way he explained it, it sounded like 12v across the plug. He didn't mention testing against ground hence why I asked if the injectors were stuck
on or not. If they are, then it indicates the drivers int he ECU are dead. When transistor or fets die they usually go short circuit resulting
injectors being on all the time. Seen it happen, not often but it can if something is wired wrong.
71 notchback,
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ancientbugger
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| posted on April 4th, 2014 at 10:20 AM |
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Both contacts in the plug were live and when plugged onto the injector it was closed i.e. not spraying.
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vlad01
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| posted on April 4th, 2014 at 11:14 AM |
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ok? current leakage though the drivers maybe? or maybe they are switched high in the off mode then switched low when firing?
sounds like a weird setup for sure.
So when cranking they don't fire?
71 notchback,
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ancientbugger
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| posted on April 4th, 2014 at 08:32 PM |
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Obviously not as the spark plugs are sparking but no fuel to the cylinders and when a spark plug is removed it is not wet and no smell of fuel.
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psimitar
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| posted on April 5th, 2014 at 02:16 AM |
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If you put a bulb inline with the no1 ECU input you can see it flash when cranking?
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vlad01
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| posted on April 5th, 2014 at 08:19 AM |
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| Quote: | Originally
posted by psimitar
If you put a bulb inline with the no1 ECU input you can see it flash when cranking?
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that is the normal way to test them.
I had a thought about how both pins in the plug are high. The ECU side could well be floating high because there is power but can't be switched low
due to missing ECU ground/s.
I would go over and check the ECU grounds, even make new ones to be sure. To me this is what is staring to sound like.
71 notchback,
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ancientbugger
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| posted on April 5th, 2014 at 09:51 AM |
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Well all the loom checked out fine including the earth cables so I'm going run an extra earth wire to the car body as the loom earths connect to the
body of the alternator so maybe that could be it. If that doesn't work then the Ecu is going to be given a bloody serious talking to!
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ancientbugger
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| posted on April 5th, 2014 at 11:59 AM |
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Well fitted new earth to body, all loom back in place ,spark plugs sparking but still nothing....anyone got an ecu?! Or better a carb
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vlad01
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| posted on April 5th, 2014 at 01:20 PM |
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according to the diagram, there is 3 grounds. did you confirm each of them?
Can you confirm you are getting trigger pulse at the actual ECU? you will need a silly scope to see it its there.
71 notchback,
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ancientbugger
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| posted on April 5th, 2014 at 02:01 PM |
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All the earths checked out, there were in fact 4 earth wires in the loom and the pulse from the coil is getting to the ecu.
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psimitar
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| posted on April 5th, 2014 at 11:59 PM |
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Reckon it's time to try and borrow a working ECU, unless you had any luck finding a Bosch specialist repairers.
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ancientbugger
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| posted on April 6th, 2014 at 10:02 AM |
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Methinks the same, I'll try taking the ecu to a place in Noosa during the week to see if they can at least check it then replace it if it's cactus.
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vlad01
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| posted on April 7th, 2014 at 09:51 AM |
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was going to say, always good to have a spare ECU to confirm with.
let us know how you go.
71 notchback,
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ancientbugger
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| posted on April 8th, 2014 at 04:30 PM |
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If anyone has a spare ECU it would be handy as I've been told to just send it down to Melbourne (Injectronics) .
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vlad01
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| posted on April 8th, 2014 at 07:02 PM |
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is this the ECU it uses?
http://www.ebay.com.au/itm/1975-1977-VW-Volkswagen-Transporter-van-ecm-ecu-co...
71 notchback,
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Joel
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| posted on April 8th, 2014 at 07:46 PM |
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Thats a 2L Kombi one, bug ones are different
Bug ECU is 0 280 000 105
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ancientbugger
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| posted on April 9th, 2014 at 04:06 PM |
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Bosch number for the beetle ECU is 0 280 000 115 according to the number on mine. Maybe they're interchangeable?
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ragged
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| posted on April 9th, 2014 at 05:08 PM |
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Do you have a manual or semi auto gearbox?
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Joel
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| posted on April 9th, 2014 at 06:18 PM |
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They stopped making semi autos in 74.
The reason there is probably two different model ECUs for Beetles is only some US models ran a cat.
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vlad01
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| posted on April 9th, 2014 at 06:30 PM |
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what did bugs use? was it L jet or D jet?
71 notchback,
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Joel
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| posted on April 9th, 2014 at 06:31 PM |
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L-jet, just the early ones didnt run a catalitic converter which Im sure would have called for a different ECU.
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vlad01
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| posted on April 9th, 2014 at 06:34 PM |
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it may, but if it doesn't have an O2 sensor i would assume it be the same.
71 notchback,
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