Help D-Jet Mercedes M110 280CE

Hi Mads,

if the picture is correct, then you measure wrongly! Your multimeter is in range 200 Ohm when you try to measure a 360 Ohm resistance. No wonder it shows "1 ." indicating above range. Switch it to 2000 Ohm before you measure secondary coil. And please switch to 2000k when you measure against car ground as second test on primary and secondary coil.

Sorry, i'm pretty stupid The secondary coil is showing 361...
But now i don't a solution to my problem BAck to testing again

Mads..

Hi Mads,

as long as I can see the mistake from a simple picture, I can help There are also multimeters with Auto-Range.

You should now repeat all your tests from scratch at the connector of ECU. You will see much less faults, I am sure. I would also recommend you to buy Bosch workshop manual M110/M114. But I just see that it is only available in German , I am sorry.

Hi Mads,
I used such an auto-range-multimeter Volker noticed yesterday for the first time.
This is quite comfortable - and your SL is equipped with D-Jetronic, too. Maybe an investition that makes sense for the future.

The sensors in your car are (your photo, from left to right):
- heat indicator (instrument board)
- thermo-time-switch (to be measured in nspecial way, see chapter 9.2 in Volkers D-Jet-Compendium)
- coolant sensor

Regards
Norbert

Did all the test again, seems like there is a shortcut from pin 7 to 11, i'm getting 368 ohm..
Any idea where the shortcut could be?

Mads

Hi Mads,

did you measure pins 7 to 11 with ECU disconnected? If you have a shortcut then, it means either

1. a cabling problem (pin 7 somehow connects to ground)
2. an internal shortcut in MAP sensor to ground - which I consider low probability

Disconnect MAP sensor and measeue 7 to ground again. If it is still there, it is 1. If it is gone, measure pin 7 of disconnected MAP sensor versus MAP sesnor housing. If you have shortcut there, replace MAP sensor.