Motor Vehicle Maintenance & Repair Asked on February 6, 2021
I would like to replace ECU of my 2001 Toyota Camry (1MZ engine) because it has very high fuel consumption. The part number of current ECU is 89661-33880. I couldn’t find an ECU with the exact same part number in my area, so I’m considering to put an ECU with slightly different part number: 89661-33890. This ECU from Toyota Windom (1996 — 1999, also 1MZ engine). Will this work with my car?
For the most part, no, you cannot replace one ECU with another without serious modification. The ECU may bolt up and the wires may fit, but with a different part number, most likely the tune within the ECU will not work in its place. There are other things besides the physical aspect, such as the ECU having the vehicle itself programmed into it so the two work together (security aspect). If not, the ECU will reject the connect and won't start the vehicle. There's a plethora of reasons why it won't work, with very few for why it might.
To answer the underlying question of improving your fuel mileage, you need to find the reasons why it's getting poor fuel mileage in the first place:
These are just a few things to consider. Changing out an ECU is not going to give you what you think you want.
Answered by Pᴀᴜʟsᴛᴇʀ2 on February 6, 2021
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