Article [13] ST1300 - FI Codes (MIL) Malfunction Indicator Lamp

Mellow

Mellow

Joe
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The PGM-FI MIL denotes the failure codes (the number of blinks from 0 thru 33).

When the indicator lights for 1.3 seconds it is equivalent to 10 blinks.

When more than one failure occurs, the MIL shows the blinks in order of lowest to highest number.


Code Reset:
  • Turn the engine stop switch to the RUN position.
  • Turn the ignition off.
  • Using a jumper, short the brown and green/orange wires on the diagnostic connector.
    1539188382549.png
  • Turn the ignition on.
  • Remove the jumper from the diagnostic connector.
  • When the FI indicator lights, immediately short the brown and green/orange wires on the diagnostic connector.
  • Verify that the FI indicator goes off and then begins blinking.
 
Last edited:
Michael kowalchuk said:
Excellent information. Ty
Click to expand...
Mellow this steathtourer I started the ga a few years ago.got hit on my st so I was gone for a while buy I'm back. I PICKED UP ANOTHER 06 which has a intermittent f1 light I can hit the kill switch then turn it back on going down the road and blip the throttle and it goes out.can you you give me some idea of where to look
 
stealthtourer said:
Mellow this steathtourer I started the ga a few years ago.got hit on my st so I was gone for a while buy I'm back. I PICKED UP ANOTHER 06 which has a intermittent f1 light I can hit the kill switch then turn it back on going down the road and blip the throttle and it goes out.can you you give me some idea of where to look
Click to expand...
First thing that you need to do is determine what fault code is being triggered. The fault code will determine the diagnostic path that will need to be followed.

Have a look at the links in the below thread to get started.

New to ST1300 ownership-- learning quickly about FI light and issues.... HELP! | ST1300 Related

Fortunately, I have never had to do this. I thought I had read somewhere a method of recovering the fault codes that didn't involve bridging the two terminals in the diagnostic service check connector. I can't find it now though, and my manual is the 2004 version which I use with suitable...
www.st-owners.com www.st-owners.com
 
Mellow said:
The PGM-FI MIL denotes the failure codes (the number of blinks from 0 thru 33).

When the indicator lights for 1.3 seconds it is equivalent to 10 blinks.

When more than one failure occurs, the MIL shows the blinks in order of lowest to highest number.


Code Reset:
  • Turn the engine stop switch to the RUN position.
  • Turn the ignition off.
  • Using a jumper, short the brown and green/orange wires on the diagnostic connector.
    1539188382549.png
  • Turn the ignition on.
  • Remove the jumper from the diagnostic connector.
  • When the FI indicator lights, immediately short the brown and green/orange wires on the diagnostic connector.
  • Verify that the FI indicator goes off and then begins blinking.
Click to expand...
Just bought an '06. Great info. Thank you! /r Brad
 
Looking for wise man or woman!!!I have dreaded code 26. Did some searching here as I always do with any issues on my 13. Code 26 is right knock sensor or wires melted or broken. Bike runs great. Over 4200 rpm’s and I get code 26. Let me know if I’m going in right direction please
1 remove tupperware
2. Access knock sensor and wires!
Then what?? If wires look good what do I do next??? I see where others replace knock sensor and it don’t fix issue. I u d’état and it can also be ecu unit. I do t want to start buying a bunch of parts only to not get problem fixed
 
Happy Rob said:
Looking for wise man or woman!!!I have dreaded code 26. Did some searching here as I always do with any issues on my 13. Code 26 is right knock sensor or wires melted or broken. Bike runs great. Over 4200 rpm’s and I get code 26. Let me know if I’m going in right direction please
1 remove tupperware
2. Access knock sensor and wires!
Then what?? If wires look good what do I do next??? I see where others replace knock sensor and it don’t fix issue. I u d’état and it can also be ecu unit. I do t want to start buying a bunch of parts only to not get problem fixed
Click to expand...

Some people have gotten lucky and replaced the knock sensor and it worked. You can switch the left and right sensors to see if the code changes to a 25.

On mine I tried a few things and finally just replaced the sub harness for the knock sensors and found another ECU. That fixed it.

Good luck.
 
Happy Rob said:
Looking for wise man or woman!!!I have dreaded code 26. Did some searching here as I always do with any issues on my 13. Code 26 is right knock sensor or wires melted or broken. Bike runs great. Over 4200 rpm’s and I get code 26. Let me know if I’m going in right direction please
1 remove tupperware
2. Access knock sensor and wires!
Then what?? If wires look good what do I do next??? I see where others replace knock sensor and it don’t fix issue. I u d’état and it can also be ecu unit. I do t want to start buying a bunch of parts only to not get problem fixed
Click to expand...
Rob,

I'm very sorry to hear that you have joined the sad fraternity of owners who have experienced a code 25/26. I started receiving error code 25 (left knock sensor) on my '05 ST13 in the Fall of 2023. This type of problem is more prevalent with '03-07 ST's, but '08 and newer do sometimes have this problem.

There are a half-dozen or more reasons why you are receiving the code. If you have a Honda service manual, it contains directions on how to test your wiring from the knock sensor rearward to you PGM-FI (ECM). Because your code is the right knock sensor, you problem could be that the plastic connector of the wire that runs from the sensor to your ECM has become brittle and is no longer allowing the wire to remain connected to the sensor. It is not uncommon for that connector to deteriorate from the heat produced by the nearby headers.

In my case, I followed the procedures in the manual. Unfortunately, the knock sensors and the wiring to the ECM were not the cause. In the end, my ECM was the culprit. I found a new unit from a part supplier in Japan, and had it shipped to me in the US. After replacing it, I have not experienced a FI error code. Last I knew, the ECM for your model year was still being produced by Honda and readily available. However, they are not cheap. Therefore, I recommend that you go through the testing sequence to rule out any wiring problems before you spend a grand or more for a new ECM.

Wishing you the best.

Chris
 
Be aware that there is a mistake in the manual regarding which code is left and which is right. I don't know if/when the manual was corrected- i.e. What year manual has the correct information. Search this site and you will find it.
 
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