Try using a very small pair of needle nose pliers, and grab one The coil test is straight forward as you read it on the diagram except you can ohm the coils with the meter and the 2 left pins in the coil my meter was set to 2000ohm and I got 960 to 976 ohms on the coils it just testing the coil wires inside on how much energy the battery will take to fire the coil.In reply to a message from Paul M. Most times the wire is broken at the connector in the wire connector where it is crimped not something you can see most times without removing the pins inside the connector.you could back probe the wire connector to read voltage if you are not getting voltage using method in service manual. The volt test on the wire harness side of the injector is reading the battery voltage you need the voltage just after the starter bump.bump it don't crank it.the first stable voltage is the actual injector voltage mine was 12.22 to 12.38 after that the voltage will steadily increase to around 12.60 and that is the CDI capacitor bleeding off going above your normal battery voltage.

Also the injectors ohm can be done without removal. This ohm reading is testing the wiring inside the injector looking for a soft/short driving the impedance/ohm up. The ohm range is 11.5 to 12.5 if your impendence/ohm go up past this it will take a lot more voltage to move the injector.

This reading along with coil voltage SHOULD BE DONE ON A FULL CHARGED BATTERY if you want accrete numbers. Have you check the voltage at the injector(wire harness side) you should get around 12.22 to 12.38 volts.this is what they call the battery voltage side. View attachment 117806 View attachment 117807 View attachment 117809 View attachment 117808 As you can see, I didn't want to modify the harness as this is a warranty issue but wanted to water test which I did and it was fine.Īgain, I share this story to offer help should any of your Yamaha engines use the same harness/connector. I removed the other pin from the connector and just used some alligator clips to the pigtail and suddenly it was firing on all four cylinders. So I was able to source a pigtail from O'Reilly's for $4 and give it a shot. I wanted to absolutely make certain that this is indeed the root cause not a valve spring or other that broke and created a harmonic that broke the pin which really seems like an odd failure to me. The pin in the connector had broken thus causing the misfire. Well, I checked each injector wire going into the connector and found the issue. Being that I had spark which I could physically see with each plug into a coil out of the engine and fire each coil it narrowed it down specifically to an injector. I used a screwdriver like the old days (I'm 45) as stethoscope and could hear each injector pulse but when I got to the misfire it was really hard to tell. I then started the engine and while looking at the computer all seemed fine again but it really had a misfire at certain RPMs. I was really stumped at this point as we know it takes air and fuel ICE to work and according to my basic tests, I had it. I then fired each fuel injector and heard each one fire. Plugs all looked 'normal' too, compression solid on all cylinders as well. Checked each coils resistance - all good. First I checked spark on each cylinder - yep, all good. When I returned home I plugged the CanDOO system into the unit and there were no codes or alarms either. I looked at all the usual suspects and all seemed normal. Anyway, after much throttle work to keep it going I was able to get back to the ramp. Thank goodness I didn't go ocean as we planned initially and I was in the previous week. At first I really thought the engine dropped a valve but my only concern was try to make it as far as I could to safety rather then being out in the middle of the large lake I was in. I was out deep in a ride at WOT when suddenly it dropped a cylinder (no codes or alarms). This is on my 10 month old 2019 Yamaha WaveRunner with 135 hrs. While this is a boating forum, thought I'd share as there is a large Yamaha presence on here and this could hopefully save someones nightmare should they have the same issue. I'm posting this here rather then the dedicated PWC section so all with this motor have a chance to see it.

Fuel injector connector clip broke