Yamaha no spark

[keys disease]

I have a 2004 yamaha 150 2 stroke with no spark. I ve tested the ignition system with the following results, CDI out peak voltage-0 volts AC, charge coil output peak voltage-145 volts AC, pulser coil output peak voltage-.5 volts AC at both the w/r-w/g and w/y-w/br. I'm leaning toward replacing the pulser coil.Also crank sensor output voltage was 3.5 AC. Any other things I should check or know about.

 

[99yam40]

Re: Yamaha no spark

what are you using to read these voltages?
what does your manual give as the proper specs?
A peak reading voltmeter or a adapted with a DMM is required to read them properly to to compare to the manual specs, and they are listed a DC volts not AC.
The pulser coils minimum voltage for my C40 is 3.0 V cranking so I would say yours is too low if you are reading it correctly

 

[keys disease]

Re: Yamaha no spark

I'm using a Fluke 87. When I use DC volts the meter flashes a voltage than shows open circuit (OC). If I use AC I get the correct reading. Also I'm assuming that because these circuits require no input voltage they are all AC outputs,generate an AC voltage....ie crank sensors. Spec for pulsar coil while cranking is 3 volts,I have 0 but do show continuity through circuits. Next day or so going to buy high dollar part and hope it works. Wish me the best. Boating rules..........................

 

[rodbolt]

Re: Yamaha no spark

before I bought a high dollar part I would buy the correct DVA adapter and use the tune up spec guide or correct manual to verify what is wrong.
your looking for a peak voltage and your meter is gonna show an average voltage.
its the way they work.
yourb engine uses 2 pulser coils and the CDI generates the spark for cylinders 2 and 5.
peak voltage cranking with pulsers dissconected is 3 volts and 2 volts connected.
hard to belive they both failed simultaneously.
they are a two lead coil and have you tested each coil lead for shorts to ground.
double check your alarm system is working and listen if you get an alarm when cranking. you should not.

 

[keys disease]

Re: Yamaha no spark

I'm using factory manual
Where can I get DVA adapter. Think fluke will do peak if set up
Didnt check output votage on 2 and 5 cause manual says votage will be 0
No alarms when cranking but how do I check? Also sometimes it does start, runs awesome, and will restart fine.

 

[keys disease]

Re: Yamaha no spark

My Fluke will do peak voltages. I'll retest and post results. 5 to 7 foot seas, going to hang out and work from home...................

 

[keys disease]

Re: Yamaha no spark

CDI output peak voltage 1,3,4,5,6-0 volts 2-.05 volts
charge coil output peak voltage R-Br 136.4 B/R-B 40.8 volts
pulser coil output W/R-W/G .5 W/Y-W/B .5 volts
all tests performed cranking
help

 

[rodbolt]

Re: Yamaha no spark

while the fluke 87 is an excelent meter RMS is NOT peak voltage.
your still not convincing me both your pulser coils failed at once.
on that sstem if a pulser fails the cylinders affected will lose 1 or both impulses,the ECU will go into default and shut off cylinders 2 and 5.
but you will still have spark on at least 2 cylinders.
if the low speed charge coil open circuits you lose all 6 if one lead becomes shorted to ground you lose 3 cylinders.
are you running the tests with the plugs in or out?
are you running the tests with the circuit loaded or unloaded?

 

[keys disease]

Re: Yamaha no spark

plugs in
circuit unloaded
now thinking charge coil cause 6 cyls no spark
thanks bro

 

[99yam40]

Re: Yamaha no spark

A Fluke 87 will not give the proper readings even set to peak. Buy a adapter or build one yourself. Do a search on the web or the forums to find info. Troubleshooting without the proper tools is a waste of time, take it from someone that has tried.

 

[rodbolt]

Re: Yamaha no spark

rerun your tests with the plugs out and a spark tester installed in each plug lead.
I have seen a slow turning flywheel due to starter or cable issues create this.
Br-R is low speed charge coil and those numbers,even though the wrong meter is used,look high enough to allow secondary spark.
remember the CDI does NOT amplify any stator input voltage it just rectifies and stores it in a capacitor awaiting a trigger signal on an SCR to discharge the capacitor into the ign coil primaries.
do a forum search on a home made spark tester.

 

[seahorse5]

Re: Yamaha no spark

try esitest.com for an inexpensive DVA meter adapter for testing igntions.

 

[keys disease]

Re: Yamaha no spark

After reading all the posts I'm thinking I am doing geomothy when addition is nessecary. I ordered a DVA adapter even if my fluke will record peak voltages. Now with adapter should I use a DC or AC scale? You guys have been great and to repay next time in Tampa area the party is on me or we'll chase grouper, snook, redfish, kingfish or meet in Orlando? The mouse is a friend.....................

 

[seahorse5]

Re: Yamaha no spark

. I ordered a DVA adapter even if my fluke will record peak voltages. Now with adapter should I use a DC or AC scale? ......

DC scale

 

[rodbolt]

Re: Yamaha no spark

I have used the fluke 87 and never have I seen a peak voltage function.
RMS is NOT peak voltage but an average of about 70%,.707 actually, of the sine wave peaks.
also known as working voltage.
as we are charging capacitors and such you need to read PEAK voltage not RMS voltage.
thats why they give the spec in peak voltage rather than RMS readings.

 

[99yam40]

Re: Yamaha no spark

My 87 will go into a record mode when you press the Min Max button and it will record at 100 ms. when you press the button below that( beeper for continuity, peak Min Max) it will record at 1 ms.
I tried this on my C40 but did not get reading like the manual was giving. When I finally used a DVA peak reading meter and later a adapter for my 87 I got readings a lot higher than than minimum the manual states. So I can tell you for a fact that the peak function will not give the readings needed for trouble shooting.
The manual states to turn DMM to DC volts

 

[keys disease]

Re: Yamaha no spark

You guys know your stuff. Fluke , even when recording, will only capture a "working voltage.'' as stated by Rodbolt. The best meter for cars but needs help with CDI ignitions. Should receive my adapter by Fri and I'll post results if need your help. Also going to check all basics first( batts,voltage drops,Fluke will work for that) and not ASSUME anything. Thanks again..................

 

[keys disease]

Re: Yamaha no spark

I finally had time to perform tests correctly, with a peak voltage adapter. Have 0 volts for CDI output on all 6 coils. Check charge coil output and get225 volts. When I reconnect charge coil plug, engine starts. I have done this numerous times and when I reconnect charge coil plug always starts. Ive inspected plug and see no problems. help.................

 

[rodbolt]

Re: Yamaha no spark

double check your kill circuit.

 

[keys disease]

Re: Yamaha no spark

Please explain. I have factory wiring diagram for engine. Thanks