Hey D-jet Fellas... Check this out - Mercedes-Benz Forum
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post #1 of 20 (permalink) Old 12-05-2015, 11:28 AM Thread Starter
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Hey D-jet Fellas... Check this out

Ditron 812D Bosch D-Jetronic tester - Mercedes-Benz Forum

Never seen one of those! Talk about something that would be cool to have in the tool rental program!
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post #2 of 20 (permalink) Old 12-05-2015, 12:48 PM
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Always wanted one of the testers. Would be cool to have one although most of the checks can luckily be done with a multimeter. I sometimes check eBay, but not really looking.

BTW, put a good lock on your garage - those used Djet part prices are going through roof. Unfortunately, eventually owners will scrap cars instead of paying crazy prices for used Djet parts like MPS, ECU, Injectors, etc.

Maybe I should sell some of my spares so I can buy a new set of injectors! By the way, Bosch have apparently discontinued manufacture of D-jet injectors.
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post #3 of 20 (permalink) Old 12-05-2015, 01:17 PM
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Home made, simplified version of the Ditron and Bosch EFAW. Lets you take measurements between any 2 contacts on the ECU. Hard part was finding spare
cables. Added the small scope to check injector pulse width and length. Not a whole lot invested, lets you do on the road testing. Early version of Tuner Studio??
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post #4 of 20 (permalink) Old 12-05-2015, 03:05 PM
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Originally Posted by 107merc View Post
Home made, simplified version of the Ditron and Bosch EFAW. Lets you take measurements between any 2 contacts on the ECU. Hard part was finding spare
cables. Added the small scope to check injector pulse width and length. Not a whole lot invested, lets you do on the road testing. Early version of Tuner Studio??
Interesting rig! I had forgotten your 280 was a djet.

Couple of questions :

- when you watch injector pulses, what voltage range do you see?

- in the harness thread, you showed an injector connector that looked like an EV1 connector rather than a djet. Is that what it is? Oops 3 wires! Must be something else? Do you have regular djet injectors?


Last edited by MBGraham; 12-05-2015 at 03:10 PM.
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post #5 of 20 (permalink) Old 12-06-2015, 10:50 AM
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Interesting rig! I had forgotten your 280 was a djet.

Couple of questions :

- when you watch injector pulses, what voltage range do you see?

- in the harness thread, you showed an injector connector that looked like an EV1 connector rather than a djet. Is that what it is? Oops 3 wires! Must be something else? Do you have regular djet injectors?

For the injectors, I check for what Benz recommends for the M110. 3volts, 2-5ms @100 0 RPM. The connector was just an example of using heatshrink for boots. It's part of a Megasquirt conversion using 98 Ford Explorer intake parts that bolt to the original intake and EDIS wasted spark. Waiting to get all the Volvo Turbo parts together, pull the engine and do all at once. We have and will use the original D-Jet injectors, Bosch says they will support 300+ HP.
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post #6 of 20 (permalink) Old 12-06-2015, 01:22 PM
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For the injectors, I check for what Benz recommends for the M110. 3volts, 2-5ms @100 0 RPM. The connector was just an example of using heatshrink for boots. It's part of a Megasquirt conversion using 98 Ford Explorer intake parts that bolt to the original intake and EDIS wasted spark. Waiting to get all the Volvo Turbo parts together, pull the engine and do all at once. We have and will use the original D-Jet injectors, Bosch says they will support 300+ HP.
Thanks! Looks interesting.

MS might come into it's own if new & used Djet parts keep going up in price.
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post #7 of 20 (permalink) Old 12-06-2015, 03:54 PM
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Graham, just realized you probably want something a little more detailed.
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post #8 of 20 (permalink) Old 12-06-2015, 07:10 PM
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Graham, just realized you probably want something a little more detailed.
What I was wondering, was if the voltage measured during a pulse was a steady 3V or does it initially spike to a higher voltage and then drop back to 3V or lower? I read somewhere that it takes 2.8v to actuate the injector.

I am re-doing my injector testing setup and just wondering whether 12V for 4 injectors in series is sufficient. In past, I used 12V per injectors but for no more than 10sec.
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post #9 of 20 (permalink) Old 12-08-2015, 12:16 PM
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What I was wondering, was if the voltage measured during a pulse was a steady 3V or does it initially spike to a higher voltage and then drop back to 3V or lower? I read somewhere that it takes 2.8v to actuate the injector.

I am re-doing my injector testing setup and just wondering whether 12V for 4 injectors in series is sufficient. In past, I used 12V per injectors but for no more than 10sec.
You can go here ASNU Fuel Injector cleaning by post and get your injector's resistance and see what the voltage drop would be. Wouldn't it be easier to tie them in parallel the way they are on the engine and set the voltage output to Benz's safer 3 volts?? Shouldn't take much amperage. My little scope isn't sensitive enough to see minor voltage spikes.
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post #10 of 20 (permalink) Old 12-08-2015, 02:25 PM
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Wouldn't it be easier to tie them in parallel the way they are on the engine and set the voltage output to Benz's safer 3 volts?? Shouldn't take much amperage. My little scope isn't sensitive enough to see minor voltage spikes.
My plan is to connect 4 in series. But just wondered what the voltage profile looked like on the car because it apparently takes 2.8v just to get the injectors to fire.

On the car, injectors are connected two in parallel. With each being something like 2.5ohms, the circuit resistance is therefore 1.25 ohms. I was going to measure the voltage that the ecu applies to the circuit, but forgot to do it before I took everything apart. I hear about it being 3V, but just wanted confirmation from actual measurement.

(Currently harness and injectors are out)
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