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RT number on main board of Bosch ECU D-Jetronic

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04 Feb 2020 21:10 - 19 Feb 2020 15:25 #13064 by bart Europe Volvo 1800 2.0 E, ES
Anyone noticed the RTxxxxxxx number on the main board? It's readable when peeking inside the box with the connector removed.
Does anyone know what it means? See attached for an example (from Paul B. Anders)
RT089969
RT074772

Anything to do with the production date?

Also I noticed there are colored stickers next to the Bosch part number sticker.
I have two units from a Volvo, one with a blue sticker and one with a blue and green sticker.
The Bosch ECU number is 0280 000 034.
RT089969 - Blue and Green
RT074772 - Blue (with green dropped of?)

Suggestions appreciated!

Bart

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04 Feb 2020 21:37 - 06 Feb 2020 22:41 #13065 by nordfisch Europe Opel Diplomat 2.8 E
Replied by nordfisch on topic RT number on main board of Bosch ECU D-Jetronic
Hi Bart, Welcome to the forum!

At first - 'RT' means 'produced in Reutlingen' (earlier ones in Hildesheim)
Maybe the other digits are just a production# or another date code - please send us the thee-digit date code (like '334') to verify this.

The colored stickers are markings for the version of the unit. Mostly ECU and MAP with the same color have to be combined.
You find information about the pairs in the 'ECU' section of Volker's compendium here:
oldtimer.tips/en/d-jetronic/53-ecu
and here (MAP-related): oldtimer.tips/en/d-jetronic/mps

You will notice the mark 'FD' there. This means 'Fertigungsdatum' = production date. The tree-digit code.

Regards
Norbert
Last edit: 06 Feb 2020 22:41 by nordfisch. Reason: link corrected

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04 Feb 2020 22:49 #13066 by Volker Europe Mercedes-Benz R107 450 SL, Mercedes-Benz W111 280 SE Cabrio
Hi Bart,

welcome and Norbert has explained what we know so far. RT = Reultingen and the rest of the no. is unknown. Underneath is the ECU number. So we have a Porsche / VW unit.

Date of manufacture is an outside stamped or punched no. with 3 digits. You find it in chapter 3.9 explained. Date of maufacture was not stamped on PCB board, only outside.

Color stickers or paint was used outside to mark subversions. However this is not systematic:

  • BMW uses color (or none) to mark subversions of the same no. and there are strict rules how to combine them
  • Volvo uses colors to identify different nos easily
  • Citroen uses colors also to mark subversions of same no but there is only one case where they are important
  • Mercedes-Benz uses coloured stickers with MB star and A or E to mark car model and European / Americas version

You will find what I have researched in chapters 3 and 4 lists. I fond BMW colors troublesome as they often vanish and normal people cannot identify what they can combine then. Best solution is Mercedes-Benz. They use same colors as injectors. So 350 has everything yellow, 450 everything blue, 250 everything green. Then you have 280 with everything white except injectors as 280 uses green ones like 250. So when I look into a Mercedes-Benz engine compartment I see queickly whether components can be correct. only in 450 I have to check for "E" and "A" and in US even further as they also have 2 numbers that can be combined.

But everything is documented in 3.9 and 4.5 . Read and enjoy.

Viele Schraubergrüße - best regards, Dr-DJet Volker
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05 Feb 2020 22:18 #13069 by bart Europe Volvo 1800 2.0 E, ES
Where can I find the three digit date code? Have been looking for it.
Attached is the picture with RT stamped into the side

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05 Feb 2020 22:37 #13070 by nordfisch Europe Opel Diplomat 2.8 E
Replied by nordfisch on topic RT number on main board of Bosch ECU D-Jetronic
Left side, below the 'RT' - mark.

Regards

Norbert

- Use Volker's link to decode the production date... the upper ECU is one month younger than the other one.

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05 Feb 2020 23:24 - 05 Feb 2020 23:27 #13071 by Volker Europe Mercedes-Benz R107 450 SL, Mercedes-Benz W111 280 SE Cabrio
Hi,

my ECU list already stated that. Change from blue to green blue in 231 . SO your 2nd ECU already lost green sticker.

But what does it tell you? Unfortunately nothing in Volvo case. I can read in my documentation what small difference they made. Not relevant to you. Green sticker in this case only means a preset idle-run rheostat. So forget it.

As I wrote in other cases like BMW colors are important (but also often missing).

Viele Schraubergrüße - best regards, Dr-DJet Volker
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06 Feb 2020 22:20 #13082 by bart Europe Volvo 1800 2.0 E, ES
Interesting. My car is manufactured in September 1971, the first month they were build as my VIN ends on 000101. Volvo 1800ES, model year 1972

Following the instructions:
x21-x31 | 197x | Month is composed of digits 2 and 3 minus 20

The production dates are then:
1972, December
1972, November

The second one (with only the blue dot) is a "loaner". The first one was from my car. This means that it is replaced at a point in time.

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06 Feb 2020 22:49 #13083 by bart Europe Volvo 1800 2.0 E, ES
Maybe a topic for a new thread, but currently I am struggling to find out why my fuel consumption is so high; 1 on 7, one liter for seven kilometer.
Also why the engine is running irregular or slightly jittering at steady speeds, noticeable at 2000 and 3000 rpm. Probably also the source of high fuel consumption.

After checking any and everything, including replacing the MAP, disconnecting the TPS, replacing the fuel filters, checking if fuel pressure is fluctuating, confirming that the cold start injector is not leaking, measuring the resistance of both the temp sensors both cold and when the engine is warm, confirming that the Aux Valve is completely closed when the engine is warm, new E10 proof fuel hoses and brand new injectors, the only thing remaining is the control module - assuming the trigger signal from the 123 ignition is not the source. Don't know if bad cables can be the source, but the injection system has been checked three times in the last two years with the special Bosch Measure Box.

The Lambda measurements at the Dyno are attached and also look more than OK.

I did borrow a second control module - to no avail. Hence the questions.
Now I need to find one that is absolutely working and maybe have the old one checked to see if that is indeed defective.

Suggestions welcome!

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06 Feb 2020 23:37 #13084 by nordfisch Europe Opel Diplomat 2.8 E
Replied by nordfisch on topic RT number on main board of Bosch ECU D-Jetronic
Hi,
the engine is running rich... I wouldn't trust the MPS.

You can't check the MPS using the EFAW-228-testing equipment.

The MPS could leak or could be misadjusted.

New units , especially of late production, can be misadjusted, too.

Do a first checkup following Volker's description and instruction here: https://oldtimer.tips/en/d-jetronic/mps

Regards
Norbert

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07 Feb 2020 00:32 #13085 by Volker Europe Mercedes-Benz R107 450 SL, Mercedes-Benz W111 280 SE Cabrio
Hi,

well 14l/100 km is a bit high. But depending on how you drive it could happen. You shoudl check whether you have correct MAP sensor, whether it is leaking, what manufacturing date it has (stamped on upper right rivet or on back) and whether it is correctly potted and still has rivets.

I have seen MAP sensors especially from the US which were remanufactured in an incredible way.

Viele Schraubergrüße - best regards, Dr-DJet Volker
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07 Feb 2020 20:29 - 07 Feb 2020 20:36 #13086 by bart Europe Volvo 1800 2.0 E, ES
Thanks for the suggestions!

Did already look into the MAP sensor and I bought a spare. Noticed on the table in the Control Unit section that both should work with the same Control Unit.

Bosch 0 280 100 035 (B20F, 110hp, US/Canada version, came with the car)
Bosch 0 280 100 015 (B20E, 130hp, European version, from scantrade.ch))

The rivets have been replaced by screws. And sealed with a paint dot.

On the Dyno both MAP sensors have been tried. Not a real measurable difference in engine behavior. See picture below. Unfortunately I did not bring a second Control Unit, as I thought this would do the trick.

Just did a quick measurement of the xx035 per your suggestion. That one must have been repaired in Canada or the US. More than happy to send that one in if you can do some further further checks. Same for the Control Module as I have a loaner.

How about the engine being to rich? Between 2750 rpm and 6000 rpm the Lambda is hovering around 0.9. Should it be different?

Bart

(Excuses for my nails, just have been trying to fix the fuel tank while it was still light)


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07 Feb 2020 21:28 #13087 by nordfisch Europe Opel Diplomat 2.8 E
Replied by nordfisch on topic RT number on main board of Bosch ECU D-Jetronic
Hi Bart,
it's quite useless to measure the coil-resistances. This testing makes sense only when the engine doesn't run at all or shows an absolute abnormal behavior. The coils are o.k. - or they are broken <no continuity or a shortcut to ground>.

Please make the vacuum-check Volker describes in the video uand search for the production code that could be stamped into the MPS body, too - maybe downside, not only to be found on a rivet.

Yes, I stated the engine is running rich. The lambda-value is below 0.90 all the time, mostly is around 0.88 or 0.87.
This is a 'rich' value, although engines are being tuned to such values for racing and performance purposes. But you are looking for an fuel-economic setup...

I know the Volvo-engines normally tend to run lean...

How much is the fuel pressure?

Regards
Norbert

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07 Feb 2020 23:12 #13088 by Volker Europe Mercedes-Benz R107 450 SL, Mercedes-Benz W111 280 SE Cabrio
Hi,

I am not sure what we really see on this diagram. If it is a test stand and we see an acceleration, lambda 0.9 might be correct. Norbert remember acceleration enrichment. So we need to know more of how this cycle was run.

Early MAP sensors until 71 had screws instead of rivets. You will then find the date of manufacture on the back side of the housing after cleaning it.

Viele Schraubergrüße - best regards, Dr-DJet Volker
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07 Feb 2020 23:38 #13089 by nordfisch Europe Opel Diplomat 2.8 E
Replied by nordfisch on topic RT number on main board of Bosch ECU D-Jetronic
Hi Volker,
the diagram shows the protocol of a dynometer-situation.

Full throttle is given from start to end - the acceleration-enrichment-extra-fuel is gone before the diagram starts.

Regards
Norbert

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08 Feb 2020 10:59 #13090 by Volker Europe Mercedes-Benz R107 450 SL, Mercedes-Benz W111 280 SE Cabrio
Hi Norbert,

even then: Full-load enrichment also means rich mixture. That is what the diahphragm in MAP sensor is made for. When accelerating or in full-load even modern cars leave lambda 1.

Viele Schraubergrüße - best regards, Dr-DJet Volker
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08 Feb 2020 21:49 #13098 by nordfisch Europe Opel Diplomat 2.8 E
Replied by nordfisch on topic RT number on main board of Bosch ECU D-Jetronic
Oh yes, Volker-
I didn't realize that.
Therefor this dyno situation is not very useful in finding out the reason for high fuel consumption.

The engine had to be tested in partial load situation, maybe the range from about 20 hp to 80 hp. I think, this is the range that matters in normal driving.

Regards
Norbert

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19 Feb 2020 17:10 #13227 by Volker Europe Mercedes-Benz R107 450 SL, Mercedes-Benz W111 280 SE Cabrio
Hi Bart,

I have removed your links to copies of people who have stolen my method of verifying a leaking MAP sensor and publish it without reference on Youtube.. What sense does it make to link that here when I have originally done that years ago in chapter 4. And please don not put further meaningless garbage pictures of test stands without a meaning here.

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