B230ET Motronic Testing v B23ET - Haynes

[rogerthechorister]

It is Volvo part number 1346329 - peculiar to the B230ET - and I've just scored one off ebay which might or might not work but will let me see how to get mine out to put new thermal paste in if possible. They are still available new from Volvo but at a horrifying price.

[Laird Scooby]

Thanks Luke, as i suspected then - power stage is a complete misnomer! Resistor pack it is, one feed in from +12V, 4 feeds out to the injectors to power them.

Some injectors have a lower voltage coil and a lower resistance as a result. There is a theory that this makes them switch between closed/open and vice versa quicker than the 12V injectors with less residual magnetism and heat.

[rogerthechorister]

No, the bit I am talking about is the Volvo part number as stated. People seem to call it an ECU but I am fairly sure it is not an ECU. Here is an example - https://www.ebay.co.uk/itm/VOLVO-740...kAAOSws3lc4wJb

[Laird Scooby]

Originally Posted by rogerthechorister

No, the bit I am talking about is the Volvo part number as stated. People seem to call it an ECU but I am fairly sure it is not an ECU. Here is an example - https://www.ebay.co.uk/itm/VOLVO-740...kAAOSws3lc4wJb

I sit corrected then! What Luke showed was indeed the resistor pack, this animal is something else! According to a list i found on turbobricks, it is called an injector amplifier, guessing that means it's a high current solid state switch to interface between the ECU and the injectors so that lower resistance injectors can be used.



Found that pic on Volvopartswebstore, seems to give a clue or three as to how it's mounted.

[mocambique-amazone]

IIRC this is Regina crap item.

Still a ECU

Have a nice day, Kay

[Laird Scooby]

If memory serves, it's a Luxor item which i think was a subsidiary of Regina.

However it has no control ability/function, it's simply an amplifier, similar to the ignition amplifier module for the coil but it's a 4 channel thing that switches high current injectors instead. To that end, it's not an ECU (Electronic Control Unit) but is definitely a "black box of mystery".

Probably just 4 Darlington pairs set up to switch the injectors for the ECU.

[360beast]

https://www.ebay.co.uk/itm/VOLVO-740...kAAOSws3lc4wJb

https://www.ebay.co.uk/itm/VOLVO-760...cAAOSwaflcv2-v

[rogerthechorister]

There is no resistor pack on my car - I have checked.

There were three of the relevant gadget on ebay - one untested currently in course of post to me. If that does not go I will buy one or both of those other two. And the current (oh, funnee pun) analysis appears to indicate that it is NOT an ECU and so will not need reprogramming when moved from car to car. And IDK who made the item but the system on the car is Motronic - it says so on a big sticker.

Now let us hope that when I put that bit in with a correct smear of thermal paste to aid heat dissipation, that stops the problem! GF is getting quite arsey about going places in that car and I refuse to drive my sport until some body damage is sorted (too ashamed). And my 960 is very poorly. And my other sport has a misfire we have been after for 6 years - there is a VERY long thread on here about it.

Before I had Volvos I might have had a hobby!

[Laird Scooby]

Originally Posted by rogerthechorister

There is no resistor pack on my car - I have checked.

There were three of the relevant gadget on ebay - one untested currently in course of post to me. If that does not go I will buy one or both of those other two. And the current (oh, funnee pun) analysis appears to indicate that it is NOT an ECU and so will not need reprogramming when moved from car to car. And IDK who made the item but the system on the car is Motronic - it says so on a big sticker.

Now let us hope that when I put that bit in with a correct smear of thermal paste to aid heat dissipation, that stops the problem! GF is getting quite arsey about going places in that car and I refuse to drive my sport until some body damage is sorted (too ashamed). And my 960 is very poorly. And my other sport has a misfire we have been after for 6 years - there is a VERY long thread on here about it.

Before I had Volvos I might have had a hobby!

Motronic is a Bosch thing, came after L, LE, LH Jetronic. The LH2.2 and 2.4 systems are often referred to as Motronic but i can't remember what numbers are usually associated with those as "officially" they weren't Motronic although most of the Motronic systems that came after are almost identical and some even use the same component parts.

[barkster1971]

You crackers are never going to fix problems if you don't know what you're dealing with in the first place.
If you want proper info , refer to the green books. Post photos and don't assume stuff listed on ebay is correct.
I have a complete set of green books, if you need any wiring diagrams ask.
Thermal paste is available for computer chips on ebay for a few quid.
https://www.ebay.co.uk/itm/5g-High-Q...frcectupt=true