Yamaha F225 ECU Upgrade

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boscoe99

Commander
Joined
Aug 22, 2013
Messages
2,203
boscoe99 said:
An F25TXRD model came with a -30 ECU and a -50 wire harness assembly.

The first F225 with full Command Link capability was an F225TXR model with a production date of April 2005. It used a -31 ECU and a -51 wire harness assembly.

The -30 ECU was replaced by the -31 which was replaced by the -32 which was replaced by the -33. Either can be interchanged with the other.

The -51 wire harness should work with either of the aforementioned ECU's.

The differences between the ECU's is not known to me.
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ct1762@gmail.com

ct1762@gmail.com

Ensign
Joined
Jan 17, 2019
Messages
957
MyTie said:
I believe you are saying that the harness will need to be swapped out; however, I'm not convinced of this because @boscoe99 said that my dad's -30 ECU was superseded by these later models. This means the pinout must be the same for the newer ECUs to plug into and work with a -50 harness. Since there is already water temp sensor wiring/connector (though it appears no water pressure like with the -51 harness) then I'm thinking it should work.
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i think you are being a bit paranoid about engine temp. Im an outboard rebuilder, and the only times youd see an overheat is from sucking up weeds at idle (would need to be a huge patch of seaweed to wrap around the gearcase to drop pressure at intakes) or a clogged t stat but these issues are extremely rare once on plane as 20 psi of water pressure cleans these components. plus as mentioned you have the alarm (a solid tone is overheat, intermittent should be oil related) and ECU limiting rpm. just sounds like he needs to know a solid tone is overheat.
 
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