Have i got the right ecu???

[andyducati]

Hi All,

Im new here and new to Volvos (1st time owner).
I picked up a 1997 V70 SE T-5 last week, on first week of ownership it seems quite a good car considering its at 209000. It had a few issues but nothing to worry about, or so I thought.
The guy I bought it off seemed OK, he said it has a miss fire when the engine is under load which I can confirm correct. It miss fires above about 3500rpm and feels like the boost is being held back (a lot). Ive got a new set of genuine plugs on order as he suggested these.
I later on noticed a few warning lights were not illuminating, the ABS, Lambda and 1 of the brake warning symbols and half of the back lighting. So I removed the instrument panel and replaced the blown bulbs.
They all now work but the lambda light remains illuminated.
The car came with an brand new sensor in its packet (still in the boot) along with a new PCV valve and pipes.
Ive found the ECU under the bonnet in the box next to cam belt. I removed this to try and clear any codes (does this work as it works on my Chrysler). I didn't want to disconnect the battery as Im not sure if I have the radio code.
I took the ECU inside to find out what type it is. Its a Bosch 0 261 203 073 (074). Google says this is a Motronic M4.3 which was fitted to the earlier 850's

So finally my question is, Which ECU do I have.
other markings are P01275106 CP01 1T26S3564 T94374533.

Have I got an a car where the ECU has failed and replaced by an earlier one? If so do I have the right map in it?
Can I read fault codes by doing the jumper method or do I need a OBD reader?

During my search I came across some interesting webpages

http://trionic.mobixs.eu/Motronic/M4.3/Volvo%20Motronic%204.3.pdf
http://trionic.mobixs.eu/Motronic/M4.4/Volvo%20Motronic%204.4.pdf

Has anyone seen them before. The picture of the inside of the 4.3 ECU is the same as the inside of mine but I think I have the early type EPROM as it has a little window covered by a sticker. But the inside of the 4.4 is nothing like mine which makes me think 4.3!!

Any help would be wonderful.

Cheers
Andy

[dera]

073(074) is 850 M4.3 ECU. It originally has a 28F512 DIL32 flash chip, but usually people replace it with 27C512 DIL28 with the UV "window".

Your V70 should have M4.4 ECU with a PLCC32 28SF010 flash inside it. 073(074) is not the correct ECU for your car.

[andyducati]

Thanks for the reply,

I did some searching earlier today and found a list of Volvo ECU's and the one I have is listed for 850 T-5 as you saidp-. The Bosch part numbers for the V70 T-5 is completely different.
Do Volvo put their part numbers on the ECU's? As I have found the ECU's in the parts section of VADIS but can't relate them to any of the numbers on the ECU itself.

Heres hoping

Andy

[dera]

Thanks for the reply,

I did some searching earlier today and found a list of Volvo ECU's and the one I have is listed for 850 T-5 as you saidp-. The Bosch part numbers for the V70 T-5 is completely different.
Do Volvo put their part numbers on the ECU's? As I have found the ECU's in the parts section of VADIS but can't relate them to any of the numbers on the ECU itself.

Heres hoping

Andy

Yes the ECU also has Volvo part number but usually you cant find that from VADIS/VIDA but need access to Volvos own ERP to convert it to a current part number. Most ECU's are exchange units nowadays so the part number will start 860, 811, 825 or 3600, but that number is not on the ECU cover. 073/074 is a pre-immo Motronic 4.3 850 T5-ECU.

If your ECU has one of those UV Window-equipped DIL28 chips inside (usually it says 27C512 on the chip), or a 28F512 Intel DIL32, it means its not from a V70. Motronic 4.4 has a PLCC32 28SF010 flash inside and they never made a V70 with Motronic 4.3.

[andyducati]

If your ECU has one of those UV Window-equipped DIL28 chips inside (usually it says 27C512 on the chip), or a 28F512 Intel DIL32, it means its not from a V70. Motronic 4.4 has a PLCC32 28SF010 flash inside and they never made a V70 with Motronic 4.3.

My ECU does have a UV window on the DIL28. Its covered by a sticker.
And it definitely does not look like the 4.4 ECU from the website in my 1st post.
Sounds like a bit of a nightmare to me.
If I got a 4.4 ECU from a similar car would it need recoding to anything (immobiliser etc) or is it plug n play?

[dera]

My ECU does have a UV window on the DIL28. Its covered by a sticker.
And it definitely does not look like the 4.4 ECU from the website in my 1st post.
Sounds like a bit of a nightmare to me.
If I got a 4.4 ECU from a similar car would it need recoding to anything (immobiliser etc) or is it plug n play?

M4.4 is plug and play. V70 has a separate IMM module for the immobilizer and ECU doesn't have a car-specific coding in them.

Your car runs because the ECU is from a pre-immobilizer 850, thus running happily without signal from IMM.

[andyducati]

073(074) is 850 M4.3 ECU. It originally has a 28F512 DIL32 flash chip, but usually people replace it with 27C512 DIL28 with the UV "window".

Your V70 should have M4.4 ECU with a PLCC32 28SF010 flash inside it. 073(074) is not the correct ECU for your car.

I stand corrected, Having taken a closer look at the inside of the ECU I find I have the 28F512 DIL32 chip without the window. But the ECU is still the 073 (074)type.
Andy

[dera]

I stand corrected, Having taken a closer look at the inside of the ECU I find I have the 28F512 DIL32 chip without the window. But the ECU is still the 073 (074)type.
Andy

Yes, the 28F512 is the original chip in the 073 ECU. The UV window'd 27C512 is a cheap and easily sourced replacement chip for the original flash chip.

Anyway, it isn't a V70 ECU :)

[andyducati]

So now we know I have the wrong item, does anyone know which is the correct part number I need for my car.

1997 V70 T5 Manual.

Andy

[andyducati]

Managed to do the flash code for getting faults, I originally had 5 (2-3-2, 2-4-5, 2-2-3, 5-3-5 & 5-3-2) worked out most of these except 5-3-2, I can't find it in any list.

I managed clear these but I still have 5-3-2 recurring.

Does any one know what this is.

After clearing the faults the car now idles very rough and almost stalls.

Any more help please.

Andy

[dera]

Managed to do the flash code for getting faults, I originally had 5 (2-3-2, 2-4-5, 2-2-3, 5-3-5 & 5-3-2) worked out most of these except 5-3-2, I can't find it in any list.

I managed clear these but I still have 5-3-2 recurring.

Does any one know what this is.

After clearing the faults the car now idles very rough and almost stalls.

Any more help please.

Andy

Your car was idling ok due to ECU correcting fueling by long term fuel trim.

When you clear fault codes, you also clear the fuel trims. After a while they will be back to where they were and car should idle ok-ish after that.

[Chris_Rogers]

Code 5-3-2 is listed here:

http://volvospeed.com/volvo_repairs_how_tos/general-volvo-repair-information-and-service/volvo_diagnostic_trouble_codes_a2.html

I would guess there is either a problem with the ECU's ignition or the injector drivers, maybe the V70 injectors present a different load to the ECU it's not expecting.

[960kg]

So now we know I have the wrong item, does anyone know which is the correct part number I need for my car.

1997 V70 T5 Manual.

Andy

I see you have been struggling so i removed the cover from my ECU and took a couple of pics. for you as my car is a January `97 V70 T5 CD Manual
Mine runs without any problems. I believe the number to worry about is the "448" at the end of the serial number! This has to be correct

Hope it helps you?

Keith

[andyducati]

I see you have been struggling so i removed the cover from my ECU and took a couple of pics. for you as my car is a January `97 V70 T5 CD Manual
Mine runs without any problems. I believe the number to worry about is the "448" at the end of the serial number! This has to be correct

Hope it helps you?

Keith

Thanks Keith,

Will keep my eye out for one.

Cheers
Andy

[andyducati]

Well I got the fault sorted. Turned ouu to be a dirty connection at the IAC valve. heyho!!
Now have just one more to try and sort out. When I connect with vol-fcr to the immobiliser there is a fault saying that the wake up command was not present (or something like that). The car runs fine but could this be the reason when I put a m4.4 ecu in the car stalls after abou a second. Tried with 2 ecu's with the same issue.

cheers
Andy

[960kg]

Just found these references to ECU`s (http://www.elecauto.com/vol740.htm) and there part numbers for Volvo`s .....it may be of some interest to you or others as well??

Very small writing but mine is there.....

[andyducati]

Ive been to my local breakers and tried a 4.4 ecu from a 1997 2.5 turbo but the car stalls after 1 second I can't even hold it running on the throttle. It looks like the immobiliser is stopping the car.
Is there any way to get round this?
Andy

[960kg]

Try here....... (http://www.volvoforums.org.uk/showthread.php?t=125251&highlight=immobiliser+fault)