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Shift position switch

N

Nector F. Robles

New member
I have 2 '94 yamaha hpdi 300's with about 650 hrs of use on each one. One motor does not respond as the other one does and is always about 1000 rpms behind the other one. acording to my mechanic the motor is not changing from 4 cylnders to 6 as it suposed to when put in gear. We have replaced the old shift position switch for a new one and have installed new gear cables but have not been able to correct the poblem. Any Sugestions???
 
Also check the wire from the switch to the ECU to make sure that it is not grounded. The switch closes to make it run on 4 cylinders only. If the wire is grounded to the block the ECU will think the switch is closed and not let the other two cylinders fire.
 
Sounds like the problem I'm having on my Yamaha 4stroke 115. I ran the diagnostic program and I only got an old code for the Shift Pos Switch.
 
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