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yamaha hpdi computer help

Old 05-05-2015, 09:16 AM
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Default yamaha hpdi computer help

I have a 2005 hpdi 300. I cant get it to start. It turns over great, but not firing. I pulled the plugs, and discovered they are not firing. I tried to hook the laptop up, and got error message that computer was unable to connect to the motor. I am guessing that the ECU isnt getting power or something, and that is causing the plugs to not fire.

Can anybody advise on how I can check if the computer is getting 12v, and or what I might be able to do to diagnose where my problem is. Thanks.
Old 05-06-2015, 10:36 AM
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Nobody has any suggestions on how to see if the computer is getting power?
Old 05-06-2015, 10:48 AM
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my first guess would be the TPS or the Crank Sensor.
Old 05-06-2015, 11:56 AM
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Have you checked the obvious............is the ignition safety switch in the on position? Lots of times, the switch gets hit, or the lanyard is pulled half out.
Is the battery up to snuff? Some engines will crank well, but if the voltage while cranking drops below 10 volts, it will not fire the ignition or the injectors.
I'd bet it's something relatively simple.
Old 05-06-2015, 02:05 PM
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Thanks for the replies. I did check the lanyard thanks. Where do I check the voltage to see if it's dropping when cranking? And how do I check the crank sensor
Old 05-06-2015, 05:37 PM
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I think your ECU is toast or not getting power
Old 05-06-2015, 05:47 PM
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Originally Posted by Schoolies View Post
Thanks for the replies. I did check the lanyard thanks. Where do I check the voltage to see if it's dropping when cranking? And how do I check the crank sensor
Put a multimeter on battery when cranking and see if voltage drops.
Old 05-06-2015, 06:19 PM
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Originally Posted by Schoolies View Post
Thanks for the replies. I did check the lanyard thanks. Where do I check the voltage to see if it's dropping when cranking? And how do I check the crank sensor
Send me a pm, I do have a spare 2005 300 hpdi ecu but want to keep as a spare. Where are you located to see if close enough to try it out? Also, I'll be back home this weekend and can send you the method to check the ecu.
Old 05-07-2015, 06:18 AM
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Thanks for the replies. I am hopeful and doubtful it is the ecu gone bad. I am sure it is a loose connection somewhere, or possibly a bad ground. The problem started when I was on the water and tilted the motor up because I got into shallow water. It stalled, and now will not start. I am going to bring it home this weekend and see if I can find any loose or stretched wires when tilting. I am also going to check the grounds. First going to check voltage on batteries when turning over as suggested. Thanks for the help thus far. I will post my findings when I can.
Old 05-07-2015, 06:32 AM
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So you are trying to use the YDS software and it is not connecting? Did you change the communication port as described in the instructions? There is a certain procedure that you have to do it. I forget how do it off the top of my head but I got the same issue multiple times until I changed that COM port to 1
Old 05-07-2015, 09:25 AM
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yes. I changed it to comm port 1 as stated in the directions. I was messing with it at the end of a very long hot day, so I might have missed something. I am going to re attempt this weekend.
Old 05-07-2015, 09:52 AM
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also, did you have the key to the on position? Any buddies in the area that also have a yammi that you could plug into?
Old 05-07-2015, 10:11 AM
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The directions said to bump the key but not let it start. leave key on then hit enter on the laptop. I have used the yds on a buddies engine, but never hooked it up to mine. Unfortunately he sold his, so I don't have anybody around that has one.I will give it a shot over the weekend. I am growing suspect of the batteries. They are both about a year and a half old. Maybe one took a crap after a short life.
Old 05-07-2015, 10:17 AM
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Check the fuses and relays under the cowl???

Old 05-07-2015, 10:19 AM
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did u check the fuses can u here the fuel pump in the vst kick on.
Old 05-11-2015, 09:08 AM
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Update. I tried again this weekend, and still no start. I was able to connect the computer to it, and nothing comes back that I can see as a problem. It did show that there was no fuel pressure however. Not sure if the system is pressurized when the key is on? Also tried testing spark again and still no spark. Is there something that would cause it to not spark and not kick the fuel pump on? Something like an emergency override or something. I did check to see that the lanyard was working while hooked up to the computer, and that was functioning fine. Checked the voltage when cranking, and it was also fine. Also checked all the fuses. All were good.I am at a loss. Any help would be very appreciated. Thanks again.
Old 03-13-2016, 05:49 AM
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Hi Schoolies,did you ever figure this one out ,I have run into the same exact issue Thanks Joe
Old 03-13-2016, 06:21 AM
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I just had a similar problem, I had a bad wire in the main 10 pin harness, the yellow wire was cut, the engine would turn over just fine but would not fire, mine was an unusual problem but worth checking out.
Old 05-19-2020, 07:06 AM
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Default Almost same problem

I have a 08 200 hpdi, and mine does this intermittent tho, when I first turn the battery switch on I have basically no power to the motor, if I let it sit with the key in the on position for 10 minutes everything will come back to life, then it will stall once of twice in the first 10 minutes of running like there is no power, but after that it will run perfectly. so I've been chasing wires and running the yds program, when "it has no power " the yds says wont connect. When it comes back to life, I dont even have a single thrown code. Any help will be greatly appreciated

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