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My OBD1 P75 ECU looks different.

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Old Dec 1, 2025 | 08:13 PM
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Default My OBD1 P75 ECU looks different.
Hello everyone, I just bought an OBD1 P75 Auto ECU from a '94 DC4. But when I opened the case, it looks different from what I'm seeing online for chipping tutorials. Any ideas?


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Old Dec 1, 2025 | 08:25 PM
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Default Re: My OBD1 P75 ECU looks different.
The construction of the circuit board is like that found in a USDM OBD-2 style ECU (even though the plug styles are OBD-1 type). You must be from another market.
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Old Dec 1, 2025 | 08:38 PM
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Default Re: My OBD1 P75 ECU looks different.
Originally Posted by JRCivic1
The construction of the circuit board is like that found in a USDM OBD-2 style ECU (even though the plug styles are OBD-1 type). You must be from another market.
So this is useless for tuning despite being OBD1?
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Old Dec 1, 2025 | 09:06 PM
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Default Re: My OBD1 P75 ECU looks different.
Originally Posted by acr_8133
So this is useless for tuning despite being OBD1?
Exactly... unfortunately. If you paid more than $20 for that ECU, you got burned.
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Old Dec 1, 2025 | 09:18 PM
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Default Re: My OBD1 P75 ECU looks different.
Originally Posted by JRCivic1
Exactly... unfortunately. If you paid more than $20 for that ECU, you got burned.
I paid $30🥲
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Old Dec 2, 2025 | 03:48 AM
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Default Re: My OBD1 P75 ECU looks different.
Originally Posted by JRCivic1
You must be from another market.
Q52, where would that be?
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Old Dec 2, 2025 | 11:24 AM
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Default Re: My OBD1 P75 ECU looks different.
Originally Posted by Chrisfrom1986
Q52, where would that be?
Australia mate
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Old Dec 2, 2025 | 07:36 PM
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Default Re: My OBD1 P75 ECU looks different.
Originally Posted by acr_8133
I paid $30🥲
Well, that's only a very mild burn. You know what an OBD-1 ECU needs to look like on the inside... and it isn't what you have. Good luck hunting.
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