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  1. #1

    Default 2004 BF 225 Check engine light on but no alarm

    First time poster, but Iíve been reading tons of posts going back years primarily covering thermostat issues and related cooling questions such as whatís the best product to use when flushing these engines - vinegar, salt away, salt off, salt terminator (Honda recommended) or others.

    Todayís issue has to do with codes. I recently had an overheating issue where the engine would drop down to limp mode and Iíd get a 20 second alarm but no light. Iíve since cleaned up the thermostats and discovered a hole in the housing which was actually blocked by mineral build-up. I plugged it with JB Weldís SteelStik product and weíre back in business (Iíll change the t-stays this winter but just cleaned them up for now). HOWEVER when I had the alarm blaring, I wasnít getting any red lights (the green stayed on), so that got me investigating the red lights. Well I cut the green and connected it to the oil level/overheat light to see if it would light up with the ignition turned to ON then go off once the engine was started, and it did. So as a result I decided to order 4 new indicator lights. I installed them yesterday and they all light up at the ON position and the green stayed on with the engine having been turned on as it should. The problem now is that the MIL check engine light is staying on!

    Is there any chance that would be because I crossed the wires when connecting? That harness is 2 black wires and the replacement light has red/black. I temporarily connected the light to the harness and once the light went on, I stayed with that setup of the wires then used butt connectors to properly connect them.

    Could it be that a code was thrown with the overheating and it just needs to be reset? If so, Iíll follow the shunt procedure to check and clear codes before taking it to a dealer.

    I donít have any issues operating the engine across the entire RPM range and Iím not getting any audible alarms either when starting or while underway.

    I have the PGM-FI ignition with 4 lights.

    Thank you reading this far and I look forward to thoughts.

    -Chris

  2. #2

    Default Re: 2004 BF 225 Check engine light on but no alarm

    Update - I tried clearing the codes with the shunt, and got the 2 beeps indicating it was cleared, but the light was still on...Also tried swapping the light connection to the harness but that just resulted in the light not working at all.

    any help would be great!

  3. #3
    Join Date
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    Hague, Virginia, USA
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    Default Re: 2004 BF 225 Check engine light on but no alarm

    Not sure I follow everything you did. However, I'm attaching a wiring diagram. This is for a two-engine set up, but you should be able to see what it looks like for a single engine. Note especially the wires going to the key switch. Especially note the red/blue wire in that small 3-prong connector.

    Electrical Diagram Honda Digital Gauges Dual engines.pdf
    CHawk 25 DLX

  4. #4

    Default Re: 2004 BF 225 Check engine light on but no alarm

    I disconnected that small 3 prong and the light went off...it was clean, then I reconnected it, and light remains on.

    What else would you like to know that would be helpful, short of rewriting my original post!

    bottom line is that the red light under the check engine light remains on, despite attempting to clear the code. There’s no audible alarm and the light only flashed when I was pressing the kill switch while trying to clear the codes.

    thanks!

  5. #5

    Default Re: 2004 BF 225 Check engine light on but no alarm

    Does you charge light stay on? This is a little confusing, is this with engine running or not? And one more thing, when you say the check engine light stays on, is your DTC shunt still connected or not, because if it is your check eng light will stay on?

  6. #6

    Default Re: 2004 BF 225 Check engine light on but no alarm

    No, the battery charge light goes off once I start the engine. I definitely removed the shunt after I tried clearing the code before starting the engine.

    The check engine light is staying on while the engine is running.- at the same time, the overheat/oil level light and battery lights are turning off, while the green oil pump light is staying on (good thing!).

  7. #7
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    Default Re: 2004 BF 225 Check engine light on but no alarm

    Go to the 26 pin connector on the engine and find the pin with the red/blue wire going to it - it's pin #11. Pull the connector apart and check the pins for corrosion, bent, or otherwise messed up. Then measure the voltage on that pin coming from the ECU. Manual says with MIL on, 0 volts. With MIL off, 12 volts. Page 5-10. If that checks out, then you likely have a problem in the wiring harness to the console.
    CHawk 25 DLX

  8. #8

    Default Re: 2004 BF 225 Check engine light on but no alarm

    Thank you chawk_man, I'll see if I can do that test. So to clarify, the voltage should be 0 and if it is, than there's likely an issue somewhere else.

    Should I have the key turned to ON or leave OFF? Also, should I touch the black on my voltmeter to the pin 1, Logic Ground 1?

    Appreciate the assistance.
    Last edited by Wasque; 08-26-2019 at 10:17 AM.

  9. #9
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    Default Re: 2004 BF 225 Check engine light on but no alarm

    With key switch off, hook up the positive probe of your voltmeter to that pin #11 coming from the ECU. Hook negative probe to engine ground. Have someone turn on the key switch while you watch the meter. Meter should initially read zero at the two beeps, then jump to 12 volts - at least that's what the manual says. If that is what you see, then the ECU is OK and you have a break or disconnect in your wiring harness between the 26 pin connector and the 3-prong connector going to your key switch.

    (Note that this sounds backwards to me - one would suspect that the 12 volts would turn on the MIL light. But either way, turning on the key switch while your volt meter is hooked up should give you two readings - 0 volts and 12 volts.)

    BTW - one other thing to check - make sure that the #11 pin is not pushed in. It should be the same height as all the other pins. Also, make sure that the female mate to that pin is not broken or corroded.
    CHawk 25 DLX

  10. #10

    Default Re: 2004 BF 225 Check engine light on but no alarm

    ok cool, I'll inspect closely and give it a try.

  11. #11

    Default Re: 2004 BF 225 Check engine light on but no alarm

    Test as Chalk described, that will tell you whether it's the boat side harness ( very likely), or the engine harness

  12. #12

    Default Re: 2004 BF 225 Check engine light on but no alarm

    What do you think about the fact that the light went off when I disconnected the harness behind the ignition previously? Not sure what that does or doesn't mean necessarily...

  13. #13

    Default Re: 2004 BF 225 Check engine light on but no alarm

    I assume you mean the 3 pin plug, disconnecting that will make the battery and check eng lights go off because that is the harness for them.

  14. #14

    Default Re: 2004 BF 225 Check engine light on but no alarm

    Ive been following this thread the conclusion i come to is that there is a relay somewhere that does not open and close as it should when the mill light should go off after
    +/- 2sec between logic pin 1 [negative] and pin no 11

  15. #15

    Default Re: 2004 BF 225 Check engine light on but no alarm

    No relay Tegweni, function is built into the ecm

  16. #16

    Default Re: 2004 BF 225 Check engine light on but no alarm

    PG1&2 go through the main PGM FI Main Relay and inside that relay there are 3 relays. Another question we must ask our self's does the buzzer work ,because if the mill light comes on it should sound the buzzer.
    Last edited by Tegweni; 08-27-2019 at 01:17 AM.

  17. #17

    Default Re: 2004 BF 225 Check engine light on but no alarm

    I am not going to get in an argument here other than to say yes, there are three relays, starter, fuel pump and ECM. Ecm remains live once ignition switch is turned on, ecm cycles fuel pump via fuel pump relay for 3 sec, warning lights are energised for three seconds, again by ecm to show they are operating. Alarm is signaled by ecm. Check engine light constantly on indicates a wiring harness fault. Suggest you start your fault finding as described by Bill. This should tell you whether the problem is in the engine harness or the boat harness ( more likely)

  18. #18

    Default Re: 2004 BF 225 Check engine light on but no alarm

    yes I pulled the 3 pin connector, but wasn't sure if that would show that we have an intact harness?

  19. #19

    Default Re: 2004 BF 225 Check engine light on but no alarm

    Quote Originally Posted by Tegweni View Post
    PG1&2 go through the main PGM FI Main Relay and inside that relay there are 3 relays. Another question we must ask our self's does the buzzer work ,because if the mill light comes on it should sound the buzzer.
    the buzzer does work...MIL light stays on but no blinking and no alarm.

  20. #20

    Default Re: 2004 BF 225 Check engine light on but no alarm

    I tried to locate the 26 pin harness to do the test but couldn’t find it...can somebody take a photo of theirs and show me? I was probably staring at it, but nothing looked like what’s in the shop manual! Thanks guys for all the help so far. Oh, I also tried resetting the check engine light again, and though I got the two beeps, the MIL light remains on with no alarm sounding.

  21. #21
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    Default Re: 2004 BF 225 Check engine light on but no alarm

    Look at your ECU. There are three big connectors plugged into it. The 26 pin is the top one. Page 5-9 in my manual.
    CHawk 25 DLX

  22. #22

    Default Re: 2004 BF 225 Check engine light on but no alarm

    Ok thanks - I wasn’t sure if it was one of those 3 and didn’t mess with it...will try that!

  23. #23

    Default Re: 2004 BF 225 Check engine light on but no alarm

    Regarding the 3 pin plug, is there a way to test it to see if there's a break in that line somewhere, in a similar manner to testing pin 11 for voltage?

  24. #24
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    Default Re: 2004 BF 225 Check engine light on but no alarm

    Yes, test it the same way - the prong with the red/blue wire going to it. It should be you the same results you get at pin 11 if the harness wire is good.
    CHawk 25 DLX

  25. #25

    Default Re: 2004 BF 225 Check engine light on but no alarm

    ok great, thank you...so hopefully those both check out - then I guess we'd go down the list of other potential issues.

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