Ecu testing

Gentlemen,

I appreciate your willingness to learn. But please be not disappointed when I tell you that such a meter must have a high acuracy both in absolute as well as in repetition if you want to fine tune your MAP sensor. And you need to control environmental pressure as well.

As long as u use it for a sanity check, I am okay with you. And I want to remind that late MAP sensors of 80s and later are not to be trusted as reference.

This does not mean that I disapprove of your projects.

And I keep my best guess that your ECU is totally okay.

Volker schrieb: Gentlemen,

I appreciate your willingness to learn. But please be not disappointed when I tell you that such a meter must have a high acuracy both in absolute as well as in repetition if you want to fine tune your MAP sensor. And you need to control environmental pressure as well.

As long as u use it for a sanity check, I am okay with you. And I want to remind that late MAP sensors of 80s and later are not to be trusted as reference.

This does not mean that I disapprove of your projects.

And I keep my best guess that your ECU is totally okay.

I feel you make it more complicated that it need to be?
If I have a original not open map that is okey and I first test this and than switch to the New overhauled map and calibrate it to the exact same value with the same barometer pressure in the room and with the same vacuum pump with the same manometer and the same instrument that repeat very well, than it can not be so big differanse from my overhauled map and Bosch original setting?
The barometer pressure is only make a smale differanse on the travel of the diaphragme that are for the full load, the Android cella will not sense the differanse in barometer pressure if I understand it correct?

The 3 nr on one of the original aluminium rivit on the map is a code for what time the map was adjusted by Bosch? How you read this code?

Mvh. Knut Åge

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Here is some map that I have overhauled

Have also overhauled alot of this AAV

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Hi,

well I cannot comment on your work as I have not seen it and I already commented accuracies. I still consider the probability that your ECU is defective as very small.

Ok, can I send 2 map to you, one orginal not open as referance and one overhauled and you check what you think about my work? And one ECU to confirme that it is okey?

What is this number code on the aluminium rivit on that map?

Mvh. Knut Åge

Hi Knut Åge,

Bosch's manufacturing date codes are explained at the end of Chapter 3.9 of my compendium . I have reported before that I have seen non-working new MAP sensors. Especially those from last years of manufacture in France up till 2002 for Mercedes-Benz are typically very far away from spec.

Volker schrieb: Hi Knut Åge,

Bosch's manufacturing date codes are explained at the end of Chapter 3.9 of my compendium . I have reported before that I have seen non-working new MAP sensors. Especially those from last years of manufacture in France up till 2002 for Mercedes-Benz are typically very far away from spec.

Hi,

Thank you, I now have read your chapter 3.9, but I have 2 map that I not understand the code on, one map have "263" and one map have "549", you know what that mean?

Ok, so you also have bad experience with the map from france, I think the map made in germany is better kvality

It look like the tolerance on the coolingwater temperature sensor and fuel injectors also not so tight? That will also make a differance on the fuel/air mixture.
You know the tolerance on this parts?

Mvh. Knut Åge

Hi,

middle number means:

2 or 3: 70s
4 or 5: 80s
6 or 7: 90s
8 or 9: 2000s

After the main time of D-Jetronic in the 70s I have seen heavy deviations, not just for those made in France (but they are famous and Mercedes-Benz has them still in stock). And I had trouble with retrofit diaphragms from the US which did not work as expected. Additionally I have seen Porsche MAP sensors repaired in the US with wrong settings which were actually scrap as they have modified everything inside.

If I am not sure on my own measured references, I check with Bosch reference values. It is a tricky job to do it right as you see in your own case. Type 3 MAP sensors are wrongly believed to be so easy and every American believes he can tune better than Bosch did. Someone in the US started to build in open adjustment screws on type 2 ones as well. Then they use an O2 sensor while driving and believe that they can adjust their 3 screws like that. Others claim that they can change bore of an 1.7 engine to 2.0l and just tweak D-Jetronic a little and it will work. I have had so many emotional discussions on such cases where people claim to know better from their own experience. They want to know why their car does not run and still listen to workshops who tell them it is so easy and that the problem must be their ECU etc.

You have bosch reference value for map 0280100015 and ecu 0280001009?

Yes I have for every ECU and MAP sensor except 0 280 100 001. But I promised not to hand over. For MAP sensors Bosch reference is only an indirect measuring method via ECU. That is why I prefer my own references and only consult Bosch reference when I am in doubt with my own reference. That happens if I did not have enough or questionable sources. And also Bosch references clearly demand that you have to set type 2 and type 3 MAP sensors in defined surroudning pressure. For type 3 even in 2 different pressures to verify altitude compensation.

Ok, strange that Bosch keep on informasion like this now over 50 years later, will think they was happy that people want to keep this old fuel injection in working condition and not trow it and change to å New and much cheaper aftermarked fuel injection system that easy do what you want.

And it is a stupid quistion to ask you if you can check and calibrate a 0280100015 map and a 0280001009 ECU after Bosch spesific correct value, so I know that I have the correct map and ecu for my car?

Can you tell me what the spesific surroundig pressure for calibrating is? Is it 1013,25mbar?

Hi,

Bosch still officially calibrate and repair both ECU and MAP sensor. Just contact your local Bosch service and they will help you.

Hi,
Today I have do some new test on my ecu test stand with a new instrument for messure openingtime on injector, with the new instrument the strange error messurement is away and I get new value that looks more normal for me without have any referance value from bosch on what is normal.

Have take the same test on 2 different 0 280 001 009 ecu with the same ohm value on air and coolingwater temprature (300ohm coolingwater temp and 391ohm air temp) and with the same map 0 280 100 015 that is orginal and not open. the ms opening time is almost exact on both ecu with in max +-0,1ms in differance betwin this 2 ecu on the same rpm and inlet pressure on every rpm vs inlet pressure i have checked, so I think I can use this as a referance to check the ecu that I have in my car, but I think you Volker have right that the ecu that I have in the car is also OK, time will show. but anyway good to know that the ecu is ok and happy that the error value is gone

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