I'm looking for some help on my 2000 yamaha 150hp vmax hpdi(vz150tlry). First off let me state that the boat has been between a yamaha tech and I, with the tech doing most of the work. The problem as been lack of power and the motor has been in limp mode. There were also codes thrown for the atmospheric pressure sensor and the fuel flow sensor. We replaced the atm pressure sensor and that began reading properly. The fuel flow sensor still wasn't reading so we replaced all fuel filters in hopes that it would right the sensor. The filters were bad and needed to be changed anyways. The sensor still wouldn't read and the motor was still in limp mode so we just replaced it. He put the new sensor in and ran the motor on the hose while it was hooked up to his laptop. The motor started and ran until his program started to boot up, and then the motor just cut out and died. Now it won't even start. It will turn over, but it's got no spark, no fuel delivery, and the ecu won't communicate. The new sensor should have cleared the code and taken the motor out of limp mode solving my problem. But now it seems we have another problem. We have now replaced the plugs, all 3 fuel filters, the atm. pressure sensor, and the fuel flow sensor. Please tell me my ecu isn't bad. Has anyone ever experienced this? The boat is currently at his shop and he is working on it, but he sounded pretty confused as well. Any guidance or advice is very much appreciated.
