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VW Golf IV IMO removal - Computer replacement and IMO removal

mtk3d 10254 10
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How can I remove the immobilizer from a VW Golf IV Siemens ECU and fix the checksum after reading the EEPROM dump?

You first need the exact ECU/Simos version, because the immobilizer data sits in different memories depending on the Siemens 5WP4 type, and your 93C56 dump may be wrong or too large [#16576664][#16576691][#16575473] Siemens 5WP4 Simos 1.x (1 plug) uses a 93C56 EEPROM, Simos 2.x (2 plug) uses either 27C010 or 29F200, and Simos 3.x (2 plug) uses a 93C76 16-bit EEPROM [#16576664][#16576691] One reply specifically says the 93C56 read posted looks too big, so the first step is to read the correct chip/dump before attempting any immo-off or checksum work [#16575473] The thread does not provide a concrete immobilizer-removal or checksum algorithm.
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  • Reading 93c56 EEPROM to remove immobilizer

    #1 16575358
    mtk3d
    Level 10  
    Posts: 10
    Rate: 3
    Hello!

    I have a VW Golf IV car that I bought to study a little bit on, among others electronics. The computer that is in it now had IMO removed, but so clumsy that it is impossible to connect to it with any interface. So I bought a second ECU, only I have to remove the IMO from it. I read through the Arduino record from the memory of the eeprom 93c56, I do not know if I did it correctly but I managed to read something (in the attachment). Now I would like to learn how to remove IMO from it and convert the checksum?

    Regards!
    Attachments:
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  • #2 16575402
    spinacz
    Level 42  
    Posts: 8576
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    And old ecu sometimes don't have k cut off in the middle and emulator.

    Added after 44 [seconds]:

    What engine? What year What ECU?
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  • #3 16575405
    mtk3d
    Level 10  
    Posts: 10
    Rate: 3
    I don't know, I didn't undress him.

    1999
    1.6 Gasoline
    SIEMENS 5WP4858
  • #4 16575412
    spinacz
    Level 42  
    Posts: 8576
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    Well, if you want to learn, bring old ecu and diagnostics to life. Is nothing connected with Facebook?
  • #5 16575420
    mtk3d
    Level 10  
    Posts: 10
    Rate: 3
    I have access to CDIF and KTS and do not connect to any of them
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  • #6 16575426
    spinacz
    Level 42  
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    ECU on the table and connect to the interface and see play it will come out useful.
  • #7 16575473
    coperfild
    Level 35  
    Posts: 2760
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    Read 93c56 correctly, this charge is too big.
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  • #8 16575755
    T5
    Admin of Cars group  
    Posts: 12861
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    And immo is not sitting in 29f ...?
  • #9 16576664
    coperfild
    Level 35  
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    1: _siemens 5WP4 Simos 1.x (1plug) ...... Eprom 93C56
    2. _siemens 5WP4 Simos 2.x (2plug) ...... Eprom 27c010
    3: _siemens 5WP4 Simos 2.x (2plug) ...... Flash 29F200
  • #10 16576678
    robokop
    VIP Meritorious for electroda.pl  
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    mtk3d wrote:
    but so clumsy that you can't connect to it with any interface

    Not awkwardly, just like you do it. Removing immo is not a corrective repair operation, only "prosthetic" the system. Why is this happening, you can read.
    spinacz wrote:
    And old ecu sometimes don't have k cut off in the middle and emulator

    There are dunks in the network, most of which are "fake" - the engine turns out at least 1800obr max.
  • #11 16576691
    spinacz
    Level 42  
    Posts: 8576
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    To the exact immo in siemens 5WP4 Simos 3.x (2plug) ...... it is Eprom 93C76 16bit
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Topic summary

LABEL_AI_GENERATED
The discussion revolves around the removal of the Immobilizer (IMO) from a VW Golf IV's ECU, specifically a 1999 model with a 1.6 gasoline engine and a SIEMENS 5WP4858 ECU. The original ECU had a poorly executed IMO removal, making it impossible to connect with diagnostic tools. The user acquired a second ECU and seeks guidance on correctly removing the IMO and recalibrating the checksum after reading the EEPROM (93C56). Participants suggest connecting the ECU to diagnostic tools, verifying the EEPROM reading, and exploring the location of the IMO data, which may also reside in other memory components like 29F or 27C. They emphasize that removing the IMO is not a standard repair but rather a workaround.
AI summary based on the discussion. May contain errors.
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