Yamaha 200 hpdi timing issues

[erickdiaz2002]

I recently bought a 2001 century with 2 yamaha 200 hpdi one is good but I am having some trouble with the other one. When I connect the engine to the yds software the first thing I did was check the code it had 2 which were 1.Pulser coil and 2. Shift position switch. After taking a look at the shift position switch we realize that the metal thing had gone off of its position we never got the code again.We also replace the Pulser coil but we are still getting the pulser coil code after the new one. On idle the engine is running very poor it doesn't turn off but on the yds software I can see the rpms are going up and down and not staying constant, It goes up to 700 and decreases to 450 rpms. The yds software shows the timing going crazy this is what it shows (5 btdc, 6 btdc, 7 btdc) going up and down like the rpms. I got the rpms up to 2600 and it stayed at 7 bidc but when I checked the firing of the cylinders it never stays with all 6 some cylinder turn off and the turns back on fluctuating. I also replaced every fuel filter and cleaned the vst. I also did a compression test and got 90 on all the cylinders . Any idea what can it be. The only pictures I have are when it was at 2600 rpms. If anyone can help I will really appreciate it.

 

[boscoe99]

First think to know is that if the code for the pulser coil is being set it does not mean that the pulser coil is bad. It means that the ECU is not getting good data with respect to the pulser coil. Could be wiring to the pulser coil or wiring from the pulser coil.

 

[boscoe99]

If a code is set the ignition timing is set to a fixed value.

 

[boscoe99]

If the shift position switch tells the ECU that the motor is in neutral then certain cylinders are deactivated based on motor RPM.

Until you fix the pulser code problem you are wasting your time.

 

[boscoe99]

Are you trouble shooting without an understanding as to how the motor functions?

 

[erickdiaz2002]

Are you trouble shooting without an understanding as to how the motor functions?

I am trying to get learn how the engine works because i am really new with it i now that if you rev it in neutral it stays at 4 cylinder and if you rev higher it drops to 2 but I am just getting informed with a lot of forms.

 

[havoc_squad]

I am trying to get learn how the engine works because i am really new with it i now that if you rev it in neutral it stays at 4 cylinder and if you rev higher it drops to 2 but I am just getting informed with a lot of forms.

The pulser error code is likely very similar to a cylinder misfire code or crankshaft/camshaft offset error code being sent. Engine goes into limp mode as a protection.

As stated above, need to identify the reason why pulser code is happening. Since replacing it didn't fix the issue, you missed step(s). Do you have the factory service manual for the diagnosing procedure?

As stated above if true, engine has rev limiter that limits RPMs when neutral shift position is detected. It's to keep people who don't know better from racing up the motor to dangerous RPMs without a load and grenading the engine.

 

[erickdiaz2002]

The pulser error code is likely very similar to a cylinder misfire code or crankshaft/camshaft offset error code being sent. Engine goes into limp mode as a protection.

As stated above, need to identify the reason why pulser code is happening. Since replacing it didn't fix the issue, you missed step(s). Do you have the factory service manual for the diagnosing procedure?

As stated above if true, engine has rev limiter that limits RPMs when neutral shift position is detected. It's to keep people who don't know better from racing up the motor to dangerous RPMs without a load and grenading the engine.

Hey, No I don't have the factory manual for the diagnosing procedure, do you know how can i get it. A couple minutes ago I was reading and I saw that there are 2 meaning of pulser coil there is the one that goes under the flying wheel and this one. I dont know if that also has something to do with it.

 

[havoc_squad]

Briefly looking I found from Yamaha:

Shop Yamaha Outboard Engine Service Manuals - 2-Stroke - 150-300 HP

Consult these certified Yamaha outboard service manuals when servicing or troubleshooting your Yamaha 2-stroke 150-300 HP outboard engine.

yamahaonlineparts.com

I also found what appears an official Yamaha owners & service manual finding website where you can find the part number and buy from them if need be:

YAMAHA MANUAL STORE

yamahapubs.com

You may need to consult with your closest Yamaha outboard dealer to verify the correct service manual part number. Those manuals are not cheap but necessary.

 

[boscoe99]

The pulser error code is likely very similar to a cylinder misfire code or crankshaft/camshaft offset error code being sent. Engine goes into limp mode as a protection.

As stated above, need to identify the reason why pulser code is happening. Since replacing it didn't fix the issue, you missed step(s). Do you have the factory service manual for the diagnosing procedure?

As stated above if true, engine has rev limiter that limits RPMs when neutral shift position is detected. It's to keep people who don't know better from racing up the motor to dangerous RPMs without a load and grenading the engine.

Not correct. RPM reduction mode is based on low oil in the main engine mounted oil tank or an over temperature event.

 

[havoc_squad]

Not correct. RPM reduction mode is based on low oil in the main engine mounted oil tank or an over temperature event.

Thank you for clarifying, I wouldn't have been surprised if it was in place though.

I believe at least the Evinrude ETEC wouldn't allow the user to change RPM while in neutral and several other current brands likely do the same as well. No need for user to alter RPM in neutral because the ECU manages what is needed to warm it up and keep it running smoothly for shifting and acceleration, no need for someone clueless to accidentally grenade the engine pushing the throttle up +4K in neutral.

It's not like they are having to choke a two stroke carb'd engine and thread the needle on the throttle until it gets warmed up enough to hold a stable idle.