Olathe Toyota seems to be the original source for this info on the internet, but their list is a bit out of date. I took theirs and revised it using what I have access to at work.

What Do Toyota Engine Codes Mean?

Since it began around the turn of the century, Toyota has produced many engines. Modern Toyota engines, such as those we will be focusing on here (1988 to present) are designated by a coded naming system. Toyota uses this system to denote what technologies are on the engine and to differentiate between the same engine, with slight modifications, being used in different markets.

The coding system works simply: the first numeric character(s) represent the engine block's generation, the next one or two letters are the engine family, and the suffix, separated by a dash, lists the engine's features. For example, a 2GR-FE engine (used in the Avalon, RX 350 and Highlander) is a second-generation (2) engine in the GR-series featuring an economy narrow-angle valve direct overhead cam (F) with electronic fuel injection (E).

The suffixes for Toyota engine naming are as follows:

• A - Valvematic variable lift intake head
• B - Twin SU-style side-draft carburetors (1900s)
• B - Flexfuel (E85) compatible (motors built after 2000)
• C - Carburated / California Emissions Controlled
• D - Twin Downdraft carburetors
• E - Electronic Fuel injection
• F - Narrow-angle valve DOHC
• G - Wide-angle valve DOHC
• H - High compression, High pressure charged
• I - Single-point fuel injection
• J - Autochoke in early models, unknown pollution control later
• K - On-demand Atkinson cycle - non-hybrid engine
• L - Transverse
• M - Philippines' market
• N - CNG fuel
• P - LPG fuel
• R - Low Compression (uses 87 and below octane fuel)
• S - Swirl intake
• SE - D-4 Gasoline Direct Injection
• T - Turbocharged
• U - Japan-spec emissions w/ catalytic converter
• V - Common Rail Diesel Injection (D-4D)
• X - Atkinson cycle - hybrid engines
• Z - Supercharged

 

Hello Brian,

I have two engines one labels 3UZ-Z88 and the other labels 3ZU-Z20. Do you think I can interchange them for sc430? What is the meaning of the suffix?
thank 4

 

^ The numbers you posted, are they from metal tags/plaques rivited/screwed to the engine? Because those look more like engine serial numbers than engine codes.

If you have a SC430 you need a 3UZ-FE, but you will need one from the same year as your car. I don't know the differences betwwen a 3UZ-FE found in a GS430 vs the SC430, so I couldn't tell you if an engine from that car would be a direct fit in a SC430

 

Hello, sorry for my late response, these numbers are on a sticker at the front of the engines. I have a 2003 sc430 and the engine-transmission came from a 2002 Japanese Soarer. Does any one know if I can install the Soarer engine in my SC430?

 

It will physically fit however because they are different years and from different markets (Soarer vs North American SC430) the Soarer motor might be missing some emissions sensors that the 430 engine has. I am not famiiar with the 3UZ in that way so this is the sort of answer you would need to ask in the Lexus SC430 group, or one of the other SC430 groups on the internet or social media