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How can I tell what ECU my 1993 Volvo 240 has? 200

I have the jetronic ICU, and I know this somehow relates... I have also found that this relates to which type of catalytic converter should be ordered. Do I have to have the Jetronic part number, or is it sufficient just to know it is a jetronic?








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How can I tell what ECU my 1993 Volvo 240 has? 200

Don't replace the ECU without first using a 'noid light to ascertain whether the computer is pulsing the injectors...

Since the car runs (albeit badly), you don't have the classic ECU failure to ground the injectors. I suppose it is possible that you have an ECU that is producing inappropriately long injector pulse widths, resulting in excess fuel dumping into the system. That would take your cat out eventually.

I think what you want to check first is that you got the correct AMM for your LH system-- checking your ECU will tell you which you have-- see rhaire's post to sort that out. Then check the last 3 digits on the part number on the AMM and get back to us.


Good luck!








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How can I tell what ECU my 1993 Volvo 240 has? 200

I've assumed (don't assume: I know) between the two mechanics that this diagnosis was accomplished. The thing is, it looks like there are dozens of different kinds of noid lights. Which one to get without spending too much? I also don't know where the fuel injectors are or where the fuel injector wiring harness is. I have a Haynes manual that intend to crack open this weekend. I haven't had any time as of yet. Thanks. Oh, and I'll check that AMM number. If that thing is wrong for my car, that first mechanic'll be hearing from me again...although the second mechanic didn't mentions anything...maybe HE assumed. At least it's Friday. But, oh, I can't drive anywhere. Heh. (laughs on me)








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How can I tell what ECU my 1993 Volvo 240 has? 200

Given the abysmal performance of that mechanic to date, I would take his "diagnosis" with a grain of salt... This seems to be based on having tried everything else he could think of. I stand by my assertion that it is time to measure, not replace things randomly.

You can try another ECU, but don't let them "take you to the cleaners" on this too-- my local pick and pull gets $50 for them if you pull them yourself. All you need to do this is the right part number and a torx screwdriver. Pop the panel off as described by Randy, remove the two screws, unclip the harness and you are good to go. Pull the battery negative cable before installing it in your car and reconnect when you are done.

My working hypothesis is still that you had a condition which caused the car to run very rich, fouling the catalytic converter, causing the foul smell.

Measure the fuel pressure at the rail, measure the output of the 02 sensor when the car is warmed up, and measure the resistance of the engine coolant temperature sensor at the ECU connector (there are temperature tables in the 700/900FAQ-- look at the resistance values for your ambient temp). Check the fuel pressure regulator as well. Have a look at the 700/900FAQ in the symptoms section that deals with rich running.

Good luck!








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How can I tell what ECU my 1993 Volvo 240 has? 200

Herb,

Thanks. You know, though I still do not know specifically what ECU my 240 has, the LH 2.4 or 3.1. (Or is that the ICU? I ask because I can swear I saw a picture of the Jetronic unit with captioning mentioning LH--) I am taking all your advice to bear but much of this stuff, per your own advice included, seems to revolve around which injection system the car has. I am going to go over all of the diagnostics you mentioned - as many as I can anyway.

So, as regards one of these, that is, checking to make sure the right AMM's installed, I need to know the right processor. I have checked the numbers on the units -- the manufacturer's and the Volvo ones -- and the are: For the ECU (the larger unit, placed in passenger footwell just above where your feet would go): 0227400169 and 353531325, respectively [not sure about the first two digits on that last one; they were cut off by the holder strap; I guessed from a bar code sticker- also cut off - that these were the starting digits of the number , if any]. There is a "4" at the top of the unit -- just a "4"; nothing is blocking the view. For the ICU (the smaller unit, placed to the right of the right foot if you were sitting in the front passenger seat), the numbers are 0280000951 and 6842115 for the manufacturer and Volvo part numbers, respectively. There is also a "CC" somewhere on the bottom of the unit.

Do these help in identifying which LH system it is?

I checked my Haynes manual and it did not provide guidance on figuring this question.

Thanks again in advance for any and all of your help.

Regards. W








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How can I tell what ECU my 1993 Volvo 240 has? 200

hello
the 0 280 000 951 is the fuel ecu, which rarely if ever go bad.
the smaller one near the tip of your toes is the ignition computer which also rarely go bad.
you have LH 2.4
you might want to get the bentleys service manual. if you are paying someone to fix your car you might want to get a volvo mechanic.
good luck
mike








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How can I tell what ECU my 1993 Volvo 240 has? 200

Thanks, HK

Can you help me pin this down a little further? Now which if these makes this a "LH 2.4," the ignition computer or the fuel computer? Confounding my understanding are these two things: one, the computer near the tip of my toes - the one that does not say "Jetronic" on it - is larger than the one that does; two, the smaller Jetronic is attached to the outside wall above where the passenger's right ankle would be and the larger one that doesn't say Jetronic on it is above where the passeger's toes would be.








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How can I tell what ECU my 1993 Volvo 240 has? 200

hello
i am a little confused.
the computer that says 0 280 000 951 is fuel computer and is larger than the ignition computer. the ignition computer has a plastic casing and the fuel computer has a metal case.
do you have a camera to post pics?
good luck
mike








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How can I tell what ECU my 1993 Volvo 240 has? 200

Simply pull off the kick panel on the right side of the passenger's footwell and have a look at the label.

Randy








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How can I tell what ECU my 1993 Volvo 240 has? 200

I have a fabric something-or-other, not a panel. Are you talking about the area under the glove compartment? I've looked a the units under there. There is the Jetronic ICU and the ECU, but neither of them have the model number. I scribbled the (shorter, right?) Volvo part numbers off of them, then -- critical emergency :) -- my daughter couldnt find me and I forgot where the piece of paper I wrote them on. The first mechanic said the "control unit" was behind the dash. Is he full of crap? Thanks








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How can I tell what ECU my 1993 Volvo 240 has? 200

Well, "behind the dash" is not how I would describe it...

The ECU is behind the rigid plastic panel to the right of the passenger's foot well, not above the knees.

You will need to remove the fabric panel above the knees as well as part of the U channel trim that goes around door opening.

The ECU is an aluminum box like device and it will have a label on the side facing the footwell which will display the Bosch number.

Randy








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How can I tell what ECU my 1993 Volvo 240 has? 200

It might be LH3.1 and use the 572 ECU, or LH2.4 with either the 561 or 951. If it is California emissions LH2.4 with EGR, 556 or 946. What that all has to do with the cat, I do not know.







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