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-   -   Knock Sensor 2003 GL1800 (https://www.goldwingfacts.com/forums/2-goldwing-technical-forum/666951-knock-sensor-2003-gl1800.html)

RonHochhauser 04-13-2019 03:38 PM

Knock Sensor 2003 GL1800
 
Wonder if it's ok to run 2003 GL1800 with a bad knock sensor since bike seems to run fine?
Showed a #26 fault code.
Thx...........

AZgl1800 04-13-2019 03:57 PM

ran my 2002 with a "bad" left knock sensor for a long long time, with no ill effects.


other than, poor mpg.


the ECM goes into Fault Mode so the fuel mileage suffers.


BTW, the knock sensor itself is not bad.
The ECM is the culprit, and it is epoxy coated and non-repairable.


I was lucky, got on www.SearchTempest.com and found a 2004 ECM 30 miles from home. could not believe it. it works like a charm.


2001-2005 are all the same.


https://www.ebay.com/itm/283419216473?ul_noapp=true


this is the only one available as of today

AZgl1800 04-13-2019 03:59 PM

I used the search terms below


gl1800 ecm ecu




it gets called different things

RonHochhauser 04-13-2019 04:29 PM

Thx for the info. New ecm was installed 3 years ago so I'm hoping not?

AZgl1800 04-13-2019 05:20 PM

Quote:

Originally Posted by RonHochhauser (Post 5835349)
Thx for the info. New ecm was installed 3 years ago so I'm hoping not?


ugh!
hate to hear that.
it is not a real common problem, but it is known to happen with the 1800s once in a while.



not restricted to just 2001-2005

OnaWingAndaPrayer 04-13-2019 05:38 PM

Ron, I just had this problem with my 03. I was getting a code 25- right knock sensor. I pulled the lower pans and the front lower cowl so I could access the sensors. I unplugged the right sensor and tested it with a digital volt meter. By tapping on the block near the sensor I would get a volt reading . Sheesh, I dont recall if I was on AC or DCscale:(. But I did get a reading and moved to the left one just to compare and similar readings. I put it all back together to ride till I could source an ECM. Its been fine the couple hundred miles since. I may have been the lucky one in a hundred but it seems as though I only had a bad connection.
You might at least try to disconnect and reconnect to see if that helps.

AZgl1800 04-13-2019 05:56 PM

the knock sensor outputs an A/C waveform that is Very Fast.


an Oscilloscope works best, but a fast digital DVM might catch the readings.


DaveO430 used the Hertz ( Frequency Measurement ) setting on his DVM to test my bike for a bad sensor.


at first, we switched them from side to side, the code stayed the same, indicating it is the ECM that is at fault.


then, Dave tested both sensors for the A/C output waveform, and yes, both of them put out the same signal.


it is very small, and very fast. look close.

DaveO430 04-13-2019 07:34 PM

Quote:

Originally Posted by AZgl1800 (Post 5835359)
the knock sensor outputs an A/C waveform that is Very Fast.


an Oscilloscope works best, but a fast digital DVM might catch the readings.


DaveO430 used the Hertz ( Frequency Measurement ) setting on his DVM to test my bike for a bad sensor.


at first, we switched them from side to side, the code stayed the same, indicating it is the ECM that is at fault.


then, Dave tested both sensors for the A/C output waveform, and yes, both of them put out the same signal.


it is very small, and very fast. look close.

As I recall I could never get anything other than a Hz signal from them.

OnaWingAndaPrayer 04-13-2019 09:18 PM

I use a Fluke 87 meter . Perhaps it was Hz where I got the reading . My point though is in my case I believe it was only a bad connection.

RonHochhauser 04-14-2019 01:04 AM

Thanks, good to know!


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