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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.

  • Woodways3
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1 month 1 day ago #22686 by Woodways3
Non Starting. was created by Woodways3
Hi Volker,Greetings from Nigel Gibb E3 1975 3.0si .I'm having starting problems,it seems I have no feed to the fuel pump.Ive checked the ECU pins 16 and 24 are liv e with the ignition on. Also the pump relay ( which is new ) is showing pins 30/51 are live but 87 is dead .I've noticed that there are two identical green and white wires one from 30/51 and one from 87 which I'm guessing is going to the pump.Look forward to hearing from you.The main relay I'm sure is not an issue I've tried three and even run the car on the original 50 year old version that was on the car from new.

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1 month 1 day ago #22687 by Dr-DJet
Replied by Dr-DJet on topic Non Starting.
Hi Nigel,

if 16 and 24 are +12V, check whether ECU sets pin 19 to low to activate fuel pump relay. At least 1 second after switching ON ignition.

Viele Schraubergrüße - best regards, Dr-DJet Volker
Alles für den Mercedes-Benz R/C 107 und W116 in der SLpedia Sternzeit 107

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1 month 1 day ago #22691 by Woodways3
Replied by Woodways3 on topic Non Starting.
Hi D djet,Thank you,Can I ask my electrical skill is not great.I just tested 16 and 24 with a test light. With a voltmeter do I put one end on the pin and the other to earth ,car metal with the ignition on to read the voltage ? When I was trying today I did hear the pump very briefly make it normal pre starting hum ! Just once in several attempts.Nigel.

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1 month 1 day ago #22692 by Dr-DJet
Replied by Dr-DJet on topic Non Starting.
Hi Nigel,

just measure against +12V (e.g. pin 16) without causing a shortcut.

Viele Schraubergrüße - best regards, Dr-DJet Volker
Alles für den Mercedes-Benz R/C 107 und W116 in der SLpedia Sternzeit 107

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1 month 1 day ago #22693 by Woodways3
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Thank you Dr Djet Volker

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1 month 23 hours ago #22694 by Woodways3
Replied by Woodways3 on topic Non Starting.
Hi Dr Volker, I tested pin 16 ,which is 12.75 V same 19 but 24 is 8.75.I connected my spare ECU and had the same readings. What do you think is wrong ? Thank you Nigel.

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