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O2 sensor problem??

S

Skooter

Advanced Contributor
I have an issue with my 03 Honda 200s. The outboard idled a little rough and turns off at times when going back into neutral.. With in the last 60 hours I have new plugs, hp and low pressure filters, new fuel pump..most recently I did SB56, but put a donor O2 sensor that was supposed to be good.. Anyways, I took boat out over weekend and after a 26 mile run, I was idling and I started to get a beep on-off-on-off, etc. I checked codes today doing the shunt and I got "1" light on and off, on and off..So is it my O2 sensor? I do also want to add that on my return back into port my rpms would only hit 3000 and seemed to lack power..Would this all be related to O2?
 
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A "1" code can also be caused by a misfiring plug or plugs, a failing coil, or a loose connection to the coil. I don't think a failed HO2 sensor by itself would cause the drop in rpm's, just inefficient fuel burn and carbon buildup.
 
Thanks chawk, I knew you'd chime in. So is there a way to check O2 sensor? How about the coils? Do you think if I pulled each coil and spark plug individually and checked for spark on each one, would this be a sufficient test? Any suggestions?
 
I pulled out the Helm shop manual to page 5-26.

The first thing they do if you get a "1" blink is to check the fuel pressure. I know that there is a fitting that will take a fuel pressure gauge, but not sure were it is and what the pressure should be. I guess that the implication here is that you could have a clogged filter or that your low pressure fuel pump could be failing. Replacement is not a big deal.

They then go through a procedure where you disconnect the 4P connector to the HO2 sensor, connect Battery + and Battery - to the two white wires coming from the HO2 sensor, start and hold the engine at 3000 rpm with no load for 3 minutes or more. Measure the voltage between the black wire and the green wire terminal. Open the throttle to wide open then release it. Voltage should be above 0.6 volts at wide open throttle and below 0.4 volts when the throttle is quickly released. If not, replace the HO2 sensor. If so, repair open or short in the wire between the ECM and the HO2 sensor.

I've never done this, so you are on your own.

As for the coils, there is a resistance test, but I cannot find it.

Hopefully someone else will jump in here.
 
Hi chawk O2 sensor testing procedure,is it on the service manual or where did you found it ?
And ignition coil resistance test, COT type ignition coil resistance cant be test, i tried with ohm meter.i think its because of transistor built in, for test the ignition coils,first do cylinder drop test, with that you can find the cylinder which not working properly,open spark plug and see, also you can see wet on the spark plug(un burn fuel or black soot on the plug tip) , then replace or interchange with another ignition coil and again do cylinder drop test. that is the way i test ignition coil,(you have to test with new spark plugs for good result )

wajira
 
wajira said:
Hi chawk O2 sensor testing procedure,is it on the service manual or where did you found it ?
And ignition coil resistance test, COT type ignition coil resistance cant be test, i tried with ohm meter.i think its because of transistor built in, for test the ignition coils,first do cylinder drop test, with that you can find the cylinder which not working properly,open spark plug and see, also you can see wet on the spark plug(un burn fuel or black soot on the plug tip) , then replace or interchange with another ignition coil and again do cylinder drop test. that is the way i test ignition coil,(you have to test with new spark plugs for good result )

wajira
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Thanks Wajira and Chawk, I will pull plugs this evening and look for wet plug. I was just gonna old school it and crank engine looking at spark plug on each one checking for spark.
 
Wajira - the procedure for checking HO2 sensor is on page 5-26 of the Official Helm Shop Manual.

Each of the "blink" fault codes that you get from shunting the service connector are described on pages 5-14 and 5-15. And each of the listed fault codes then refers you to a diagnostic page. In this case, a "1" blink refers you to page 5-26.
 
Update...I checked each coil and plug and had spark on each one...all plugs were black like it was running rich, so I will order a brand new O2 sensor..boats.net only lists one, so I get it works for pre SB56 and the ones that have SB56 done?? I have original ecm on it. I just want to make sure I order the correct one
 
Isn't there an ECM update that should be loaded with the new type sensor to improve the sensor reliability? We have some 2007 BF175's that were killing sensors every few months. Honda finally fitted some type of experimental 'cover' along with a new sensor on the last failure. We then also bit the bullet and lifted the transoms (it's a cat) and extended the engines to get them higher out of the water (they did meet minimum spec earlier). One of those things fixed the problem and we have gone through a season without a failure at last.
 
There was an upgraded HO2 sensor for those 200/225's with SN's of 1400001 and above. It is covered in service bulletin # 70. That upgrade also required the replacement of the ECM.

If anyone needs a copy of SB#70, send me an e-mail at [email protected].
 
Roger that. As I said before, the failed HO2 sensor should not have caused you to lose rpm's by itself. But if were bad enough to foul the plugs, then that could be the issue. Your are using NGK IZFR6F11 plugs, correct?
 
chawk_man said:
Roger that. As I said before, the failed HO2 sensor should not have caused you to lose rpm's by itself. But if were bad enough to foul the plugs, then that could be the issue. Your are using NGK IZFR6F11 plugs, correct?
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Yes, I am using those plugs and they prob have 30 hours on them. Well I placed an order to to SB56 on my counter rotation outboard and water pump, as well as a new O2
 
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