Die Bosch D-Jetronic war 1967 die erste Großserien elektronische Einspritzung der Welt. - Bosch's D-Jetronic was the first mass-production electronic fuel injection.

Non Starting.

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02 Feb 2025 09:20 #22781 by Woodways3
Replied by Woodways3 on topic Non Starting.
Hi Norbert ,How can my ignition switch be tested for being faulty ? Could I test the cable to the fuel pump fuse and to ground with the ignition on .? This fuse is part of the main fuse board. With a test light. I'm suspecting the problem is intermittent, as after sometimes the pump activates. Also I've not seen that my electric aerial does not come up when I turn on the ignition ,whether this is the ignition switch or the aerial at fault !. Regards Nigel

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02 Feb 2025 12:51 #22784 by nordfisch
Replied by nordfisch on topic Non Starting.
Hi Nigel,
the aerial is normally activated by the radio, not by the ignition switch.
Maybe the radio itself is powered by ignition switch...
The fuel pump relay gets the power from fuse 7 (coupé) or fuse 11 (sedan).
You should check the voltage there.
 
Regards
Norbert

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02 Feb 2025 17:19 #22788 by Woodways3
Replied by Woodways3 on topic Non Starting.
Hi Norbert ,Thank you.Yes my saloon pump fuse is number 12,This also oil light ,fuel gauge,rev counter, temp gauge fuel tank hand brake etc.These do come on with ignition.( always) Is there a part of the switch ,which separately supplies feed to this fuse to power the pump? I will try voltage tomorrow as its too cold now.Regards Nigel.

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02 Feb 2025 20:13 - 02 Feb 2025 20:16 #22793 by nordfisch
Replied by nordfisch on topic Non Starting.
Hi Nigel,
I don't have electrical schematics for the whole car.
You had to find it out there - but I don't think the pump-relay is connected by a separate contact.
In my D-Jetronic-manual, edited by Bosch, the pump <relay> is connected to fuse 11. Maybe this is different at RHD cars??

Regards
Norbert
Last edit: 02 Feb 2025 20:16 by nordfisch.

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02 Feb 2025 22:34 #22795 by Woodways3
Replied by Woodways3 on topic Non Starting.
Thanks Norbert I will try volts to ground on the pump relay fuse.Best Nigel.

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16 Feb 2025 10:24 #22862 by Woodways3
Replied by Woodways3 on topic Non Starting.
Hi Norbert, After lots of testing I've found that my original ECU is no longer turning on the fuel pump.I now have my spare ECU which is working the pump.The car now starts but is running very rough like not on all cylinders and of course noisy which makes it hard to hear if all the injectors are working.It idles about 2500 revs and if I try the throttle it will rev but still runs rough..I did see you mention not to have the fuel rails zinc coated ,I did have mine done a few years ago .Do you think I might have some clogged injectors ? Not sure what to do next? Regards Nigel.

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16 Feb 2025 12:58 #22863 by Dr-DJet
Replied by Dr-DJet on topic Non Starting.
Hi Nigel,

my god that was my first reply that you should check whether ECU applies ground to 19 to activate fuel pump. 9 pages earlier.
[img


If you have a collection of broken ECUs, it will take us many more pages. Reconnect ypur old ECU and apply ground to 19. You should hear the fuel pump running. If your engine runs well now, your 2nd ECU has a fault as well. If not, check which injector ticks (by touching it) and report back.
Viele Schraubergrüße - best regards, Dr-DJet Volker
Alles für den Mercedes-Benz R/C 107 und W116 in der SLpedia Sternzeit 107
Workshops D-Jetronic 20.9.(ER)

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16 Feb 2025 15:27 #22867 by Woodways3
Replied by Woodways3 on topic Non Starting.
Hi Norbert apologies, yes I know I'm rubbish at testing.Ok with the ignition on and with my volt meter connected to pin 19 ,and ground I have 12.44 volts ,no sound from the relay or of course the pump.This was me testing my spare relay which started the engine yesterday .I then tested my original ECU  exactly the same . If I put bridge the live terminal and sorry forgot the number of the pump relay the relay works as does the pump. Over to you.Regards Nigel.

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16 Feb 2025 15:45 #22868 by Dr-DJet
Replied by Dr-DJet on topic Non Starting.
Hi Nigel,

you are not only bad at measuring but also bad at names.
Viele Schraubergrüße - best regards, Dr-DJet Volker
Alles für den Mercedes-Benz R/C 107 und W116 in der SLpedia Sternzeit 107
Workshops D-Jetronic 20.9.(ER)

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16 Feb 2025 17:21 #22870 by Woodways3
Replied by Woodways3 on topic Non Starting.
Sorry I didn't understand your message.!

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16 Feb 2025 17:29 #22872 by Dr-DJet
Replied by Dr-DJet on topic Non Starting.
I am not Norbert as you can read from my signature.
Viele Schraubergrüße - best regards, Dr-DJet Volker
Alles für den Mercedes-Benz R/C 107 und W116 in der SLpedia Sternzeit 107
Workshops D-Jetronic 20.9.(ER)

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16 Feb 2025 19:04 #22875 by Woodways3
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Sorry ,Dr D Jet Volker. Could you kindly answer my post .? Regards Nigel.

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16 Feb 2025 19:24 #22877 by Dr-DJet
Replied by Dr-DJet on topic Non Starting.
Hi Nigel,

I am still back at my post 22863   . Please use original ECU and put ground on pin 19 to activate fuel pump. Or connect a 2.5mm² cable from battery to fuel pump with a fuse ! Then check 1st ECU whether it operates engine well.
Viele Schraubergrüße - best regards, Dr-DJet Volker
Alles für den Mercedes-Benz R/C 107 und W116 in der SLpedia Sternzeit 107
Workshops D-Jetronic 20.9.(ER)

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17 Feb 2025 17:59 #22884 by Woodways3
Replied by Woodways3 on topic Non Starting.
Hi Dr Volker, With a test light on pin 19 to ground the car started and ran for only about 7 seconds and stopped and did not want to restart. This is with my original ECU,Regards Nigel.

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17 Feb 2025 19:00 #22885 by nordfisch
Replied by nordfisch on topic Non Starting.
Hi Nigel,
why don't you do what Volker said?
He asked for a connection from '19' to ground.
Without a test light.
Just a connection.

Regards
Norbert

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17 Feb 2025 21:15 #22886 by Woodways3
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Sorry I misunderstood..A piece of wire from pin 19 to earth the ECU .Regards Nigel.

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17 Feb 2025 21:28 #22887 by nordfisch
Replied by nordfisch on topic Non Starting.
Nobody told about earthing the ECU.
The connection from 19 to earth (ground) will activate the fuel-pump-relay permanently.

Regards
Norbert

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17 Feb 2025 21:51 #22888 by Woodways3
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Ok I understand .Thanks Norbert. Nigel.

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18 Feb 2025 16:08 #22890 by Woodways3
Replied by Woodways3 on topic Non Starting.
Hi Dr Volker. I connected a wire with a thin needle to pin 19 and the chassis .I could hear the pump ,the engine started for maybe 2/3 seconds only .It would not then start.I took the spark plugs out and they were wet.So I cleaned them and tried again ,no joy .I then took one plug out and held it near the rocker cover ,there was a spark and the engine 


started.in fact I believe it did very briefly .I turned the ignition off as it didn't sound nice.Im trying to do these tests on my own which is not easy in a very narrow garage..Regards Nigel.

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18 Feb 2025 16:58 #22891 by Dr-DJet
Replied by Dr-DJet on topic Non Starting.
Hi Nigel,

then it means that your 1st ECU has more problems. What is wrong when you use 2nd ECU?

But first remove all spark plugs and turn engine via starter without ECU so that fuel pump wont run. You have to clean your cylinders and spark plugs from that fuel sea.
Viele Schraubergrüße - best regards, Dr-DJet Volker
Alles für den Mercedes-Benz R/C 107 und W116 in der SLpedia Sternzeit 107
Workshops D-Jetronic 20.9.(ER)

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