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Opel corsa B keeps cut off with new ICM

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  • [Corsa B 1993-2000] Opel corsa B keeps cut off with new ICM

    Hi all

    Please any one can help me ?, i have an issue with my Opel corsa B (1.2, C12NZ, year: 1997) since 10-2018

    the issue begin since 2018 my car cut off and don't want to start.
    after diagnostics in garage, i changed my original ignition control module (ICM) for the first time after 20 years.

    I changed it by HUGO module (made in germany)
    After 6 months my car cut off again and again and refuse to start.

    I decide to buy a new module GM Original, the car works fine for 10 days and begin to cut off again and refuse to start.

    In garage i tried to change my original ICM it by a new chinese Module (Huizhong HZ 2027) its work fine.

    i decide to change:

    - ignition distributor
    - ignition Coil
    - spark plug wire

    - Test alternator is Ok
    - Battery ok

    When i put a new module (GM, HUGO, TOPRAN) the car start and work for few days then begin to stall. But if i put the chinease module it works fine and don't cut off.

    My question is: why with the chinese module, my car works fine but when i change by a new one, my engine cut off?

    Please help!

  • #2
    Hi welcome to the forum

    The problem may be that one or more of the female electrical contacts on the terminal block ( that plugs into the ICM) were not making a good electrical contact with the male pins on the ICM. It may be too loose, or corroded and dirty .

    A new ICM might work ok for a while but its not a cure if the problem is with the old terminal block. Its still worth checking this has no green or white corrosion, even if its working ok for now.

    Its possible the male pins on the Huizhong are slightly bigger than those on the other makes, so the connector plug is a better fit than it was before.


    • #3
      Hi Bugman,

      Thanks for your welcome, yes i'm new member

      Thanks a lot for your help, it's a good idea i never thought about that. i will check the connector, also the pins on the Huizhong and i will compare it to the new one and come back to you


      • #4
        The difference in pin size may be too small to see any obvious difference , Maybe 0.25 mm. You may notice a difference between how easily the plug connects to one ICM compared to another.


        • #5
          Hi again,

          So i checked the connector ( terminal block that plugs into the ICM, as you said) and i see that there's a bit of corrosion on the pins ( orange/red colour) below photos:

          Click image for larger version  Name:	80578792_2494131507572534_7442169607948861440_n.jpg?_nc_cat=101&_nc_ohc=3metrjreLPgAQkcxDmG8fNMWrUm9JVdry1aDbvdfwXAzrc0sUJXJqKfBg&_nc_ht=scontent.ftun1-1.fna&oh=dc5f8152d4cd5d245d69799034390af8&oe=5EAE0D56.jpg Views:	0 Size:	79.0 KB ID:	124214

          Click image for larger version  Name:	79762709_1726021800867092_5921821004153225216_n.jpg?_nc_cat=104&_nc_ohc=fN5VJoR2aIUAQnFCTujSrP2ZkOHamNf-SBqCyuQiXMqebx7B2mVM8OV2g&_nc_ht=scontent.ftun1-1.fna&oh=a2b35d3132eeeee48d8970002e7e56ab&oe=5E7C2506.jpg Views:	0 Size:	74.6 KB ID:	124215

          About the size of pins, below photos of chinese and HUGO, i notice that when i plug the chinese there's a difference: i heard a big "click" and more easier than HUGO
          And also i think that for chinese the pins are more longer then Hugo as below photo

          Click image for larger version

Name:	79979067_527947821124974_1349544841129754624_n.jpg?_nc_cat=110&_nc_ohc=7Z0KIX1V8koAQmtubmZjs9qd4ypTMMWcRc50yIHv9nQNZszeMN38PGPgA&_nc_ht=scontent.ftun1-1.fna&oh=32f49b90b3788b6e4309f21173d68db8&oe=5EAA904A.jpg
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ID:	124219

          for second photo

          to the left: Hugo ************************************************** ************************************************ to the right: Chinese,

          Click image for larger version  Name:	80112712_1434415066735185_5180043516062990336_n.jpg?_nc_cat=106&_nc_ohc=1UoMep55fNIAQk_ub4WpLkKo3viJA18TvPuSs51wZSxdF3vmM-T96EQAA&_nc_ht=scontent.ftun1-1.fna&oh=14c6b7cb94e72ea49af6cb9953d60206&oe=5EA5A790.jpg Views:	0 Size:	62.2 KB ID:	124217

          on TOP: Hugo
          Down: Chinese

          Click image for larger version  Name:	81223004_959859954408755_7874776005540315136_n.jpg?_nc_cat=103&_nc_ohc=R256exwBWQ0AQmW3-XIs4W-z46TcedNjl50yJIJ6P7-qwQvZlo3XK4oWQ&_nc_ht=scontent.ftun1-1.fna&oh=9b70246879713a602cf090b4a8dfa25c&oe=5EB24A30.jpg Views:	0 Size:	92.1 KB ID:	124216

          so i think that i will replace the connector ? and i'll see what happens ? ( i'm not able to do it myself, i have to go to garage next week)
          Last edited by Monder; 21-12-2019, 05:40 PM.


          • #6
            It may be good enough just to clean them. You can buy special contact cleaner in a spray can. In English it is called either 'electrical contact cleaner ' or 'switch cleaner'. You can buy it in stores that sell car parts, or in DIY stores that sell electrical plugs etc. Or on- line. It contains strong solvents to remove contamination. It a may also help to use tissue , or a soft brush as well as the spray.

            Contacts are often electroplated with bright zinc or brass for protection .If corrosion has worn this plating away to bare steel it may be better to fit a new connector as it may corrode again quite quickly.

            The female contacts seem to be two contacts that grips the male pin between by spring action. After you have cleaned these make sure that they will still hold the male pin tightly . If not you may be able to bend them slightly so they will.


            • #7
              Many thanks i will do this on the next week , i hope that will resolve the issue

              Thanks again


              • #8
                Hi !

                So i have cleaned the connector with WD-40, but i will buy the "CRC cleaner" It's better i think. a Friend said to me that the connector is fine and the colour (red/orange) is not a corrosion it's the original colour of the pins. this is photo before and after clean, what do you think please ?

                Before clean After clean

                Click image for larger version

Name:	80702100_553026721944846_6582793716270891008_n.png?_nc_cat=110&_nc_ohc=C5qDQtlMicwAQkOTbuCK81ueh-xSyUSRLIaFpzAjmgJ7ET-5jMtyWOoSQ&_nc_ht=scontent.ftun1-1.fna&oh=1de14763b80f98fff4be274fe149f0dd&oe=5E679DED.png
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                So if the connector is fine, there are another reason for engine cutting off with new ICM ? can you help me please, what can be the other reason ?

                For informations i have changed all below : Ignition coil, Distributor, spark plug wires.
                Help please


                • #9
                  Hi all,

                  Hi Bugman,

                  So since 3 days after that i have cleaned (too hard) the connector with WD-40, my car works fine and not cut off ( i have removed the chinese ICM and i putted the ICM that cause the cutting off of the engine)

                  I hope that it was the problem

                  I will confirm after 2 weeks
                  Last edited by Monder; 27-12-2019, 05:14 PM.


                  • #10
                    Monder has sent me a PM saying the original module is still causing problems. Only the Chinese one seems to be reliable ,at least for now. Naturally he is concerned that if the other ones sometimes dont work this could also happen to the Chinese one. (They may all be made in China , even the Hugo 'Germany ' one. )

                    I can make some suggestions, but others may have better ideas .

                    Looking at the photo of the cleaned female connector above, there is a slight gap between each pair of contacts. Ideally they should touch each other so they grip the male pins on the ICM tightly on both sides .
                    Also there appears to be some brown stains on the contacts. This may be rust , which indicates that the bright zinc protective coating on the contacts has worn through to the spring steel underneath. Any rusting , or other corrosion or pitting , makes for poor electrical connection, that is likely to get worse over time.

                    Ideally try and fit a new connector plug if you can find one. If not you could try cleaning off any rust completely down to shiny metal. Make sure any dust etc you rub off is cleaned away properly . It may also help to try to bend the contacts slightly so they grip better. But you will also need to use some sort of protective electrical grease to prevent further rusting. Some people use Vaseline petroleum Jelly for this, but you can buy specialist electrical contact grease that will do a better job..

                    WD40 can do many jobs quite well, but is not the best product for any of them. Its mainly a water dispersant (thats what WD stands for) .It may work well for cleaning, but wont protect the contacts from rust or corrosion for very long .


                    • #11
                      Hi all,

                      Thanks a lot for your reply Bugman, i bought a new connector from AliExpress. So i will install it and testing with new ICM to be sure
                      I will come back with result.

                      Thanks again for your help


                      • #12

                        So i'm so desperate, i dont understand, it's so strange!
                        I have installed a new connector and i put a new ICM (HUCO) , when i start the engine, it stall immediatly and after it refuse to start.
                        I put a second new ICM (TOPRAN 202127), the same matter, the engine refuse to start.

                        I put the chinese ICM, the engine Start and never stall !

                        Please any one can give an idea ? My car refuse all new ICMs (TOPRAN, HUCO, GM Original, GE&BE) and accept the chinese ICM !!

                        Really i'm so desperate i think that i'm the only that i have this issue !!!!

                        Please help.


                        • #13

                          The only thing I can think of is if the connector plug and pins were making bad contact before this might have caused arcing .ie an electrical spark jumping across the tiny gap or resistance . This spark will cause an electrical spike, or surge . This might only last a fraction of a second, and not be visible or audible but could be enough voltage to damage the delicate circuits in the ICM. Or the spike may have been caused by connecting or disconnecting the ICM while one or more of its pins was still live, ie with the ignition on.

                          I dont know if its possible to damage an ICM in this way , but you can certainly damage computer circuit boards just from the static electricity in your hands, unless you discharge yourself to earth/ground first.

                          Its possible ALL your previous ICM's were damaged in this way , with only the Chinese one , that may have made better contact and did not spark, escaping undamaged.

                          I cant say for sure this has happened but it may be the reason, and an explanation that might put your mind at rest.

                          You can find out more by googling electrical spikes , surges, static electricity when handling computer components etc.


                          • #14
                            So please, i will try with another new ICM, what should I do exactely before installing the new ICM ?
                            i have a second question please (maybe stupid question): if The ECU (engine control unit computer) can affect the ICM ?


                            • #15
                              This is already beyond my knowledge. If anyone else knows the answer, or has any suggestions ,or disagrees with me ,please feel free to reply

                              My theory that the other ICM's have been damaged is just a theory. I may be wrong and hate to think you may be wasting money on the wrong solution. You could test the others by seeing if they work ok in another car of the same age - if you can find one. A specialist might be able to test them electronically but this may cost more than buying a new one .

                              If the Chinese one is working OK why do you wish to replace it? Is it because you want to keep a spare one in the car you know is working ok? If so then maybe buy a new ICM,and its your choice whether you fit it to test it works (keeping the working one you took off as the spare, ) or just hope that it works if you ever need to use it. .This may be a better option if you have a free breakdown/recovery service anyway. Although I would normally recommend buying a top brand it appears the most reliable one is the chinese one,which may also be the cheapest. As I said before they might all be made in China anyway, or use the same electronic components.

                              I dont know for sure about installing the new ICM. Certainly you would need to ensure the ignition is off. But electronic devices can still retain electricity for quite a while after they are switched off. To be on the safe side it may be a good idea to disconnect the car battery, and leave this disconnected for about 30 minutes before disconnecting the existing working ICM module and fitting the new one. And dont touch any of the pins with your fingers in case of static electricity. Before disconnecting the car battery make sure you have any radio security codes etc you might need.

                              I dont think asking about the ECU is a stupid question ,especially as I dont know the answer either ! My guess is that yes the ECU will communicate with the ICM in some way. But whether this could be the reason the ICM's keep failing (but not the chinese one) I dont know. Others may know more.