Yes, the diagnostic port is just a 3 pin connector, usually in loom across the rear of the engine bay. There is also often an identical connector that is for the octane adjusting plug. If you find a 3 pin connector with a plug with a loop of wire connected into it, then that is the octane plug.
Not that it will help you much as it’s pre OBD standards and will only work with a specific diagnostics code reader. You can get the codes out with an led and switch but it’s fun counting the flashes. The mondeo Ecu’s are still around and you are lucky your H4 is based on a 1.6SI as thats the only Fiesta loom that is pin compatible with the early Mondeo 2.0 ecus. While you are in the engine bay see what the part number on the MAF is and what colour the ring on the rear of the injectors is. Just noticed you mentioned the ECU is above the glovebox, are you sure thats not an alarm control box, the ecu is under the drivers side of the dash (unless yours is LHD) , next to the door pillar. Is your H4 Blue ? Jim From: Julian Coleman Sent: Wednesday, December 20, 2017 3:18 PM To: [email protected] Subject: Re: [Quantum Owners] H4 EFI ECU Jim That's really helpful, thanks. I've since been told that the diagnostics port, if it has one, is not part of the ECU itself but separate and can be located just about anywhere. Your comments re the ECU being compatible are really interesting. I guess it raises the question as to what the best solution is. I'm guessing finding an appropriate 2L ECU is not as simple as it sounds. But step 1 is finding out what is in there! Regards Julian Coleman City Audio Services ----- Original Message ----- From: [email protected] To: <[email protected]> Cc: Sent: Wed, 20 Dec 2017 14:40:31 -0000 Subject: Re: [Quantum Owners] H4 EFI ECU You just need to undo the clamp from under the dash. Then, in the engine bay undo the M10 bolt in the centre of the big connector and the ecu will drop down into the car. The 2.0 won’t run very well with a 1.6ecu as the 2.0 has a different MAF and injector size. But that’s the next step , first find out what the ecu is, you are looking for a 4 letter code that usually spells a word. I think GURU was the 1.6si code and DEEP, DESK and another 4 letter word begining with D were the 2.0 Mondeo ecus Jim From: Julian Coleman Sent: Wednesday, December 20, 2017 2:15 PM To: [email protected] Subject: [Quantum Owners] H4 EFI ECU Hi I'm attempting to get to grips with an H4 which has a 2L Zetec but I believe run by an original ECU for a 1.6 Zetec (Mk3 Si). I have found the unit, up behind the glove box where it's not too easy to get at and I cannot see any labels. I need some practical advice as to how to gain access - I can't actually see what is going on up there. I think I can probably loosen the clamp bolt. But what happens if I do? Would the unit drop out with its wiring attached? Where would the diagnostic port be? Any other info would be gratefully received. Regards Julian Coleman City Audio Services -- -- You received this message because you are subscribed to the Google Groups "Quantum Owners Group" group. 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