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THE WITZL
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July 2002

Re: ECU Compatibility across models ? Tech advice needed.	Fri, 29 April 2005 16:59

when it comes to "mix and match" engine electrics, its generally best to avoid doing so with a air flow metered engine.... Take the example of good old Joe here in Sydney. For ages he had a nice running 2tgeu with factory electronics (i know its analogue efi, but this is a good example). HOWEVER - he too was always runnning a little rich and had shithouse fuel economy. An experienced person suggested that perhaps his AFM and ECU were not from the ONE CAR (not just same model car, but the one singular car). Indeed this was true as Joe was given an ECU and AFM off a shelf which were just loose spares. Joe hunted and eventually found and ECU and AFM together on a wreck and thus bought the pair, knowing that they were from the one car and thus matched from factory. Plug them in and HEY PRESTO!!! PROBLEM SOLVED!!! The point here is that the ecu was specifically tuned to that individual AFM which cam with the car - Toyota had matched the two to be perfect. I feel this may still be the case with the 1ggze, as we are talking about a device which relies upon movement to create a feedback signal - not a solid state device which can give signal accuracy from one device to the next with negligable to zero error rates. Do you follow me so far?? Because the AFM relies on a spring with a set tension, no two AFMs can be assured to be identical in signal response - as the spring rate cannot be consistent throughout a production run.... they will be close, but not THE SAME. THis might sound pedantic, but it's something that makes sense to me... and it is 2:50am. So yeah... perhaps the signal from the AFM is lower for a given air flow rate than what the ECU is expecting... thus the ECU is adding more fuel than there is air to burn it in a balanced mix. now as for GENERALISING the compatibility of toyota ECUs... its not something that you can generalise the answer to. WIth MAP sensor engines such as the 4age's and 1jz-gte's... yes mix'n'match can be done just fine to an extent - so long as the ECU is from the same generation engine and the supporting electronics are compatible. eg. AE101 smallport gze ecu can run an AE92 smallport gze engine no worries (a couple of pinouts different tho). a JZX81 ecu can run a JZA70 engine etc.... i have typed too much now. [Report message to a moderator]

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