2003 1800 ECT fault


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patoy
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2003 1800 ECT fault

Post by patoy » Sun Jul 29, 2018 3:50 pm



Had the F1 fault light come on coming home the other night, a couple of miles later engine skips or misfires a couple of times, got into town and had rough idle and stalled at a light, restarted no problem. Made it home without further issue. Next day started bike and no F1 light, bike ran normally for 10-12 mile outing. Went for ride next day and 15 miles down the road F1 light comes on again, couple miles after that misfires/skips a time or two then no other noticeable problems going back home. Checked code by putting kickstand down and got 7 flashes which shows ECT fault in my manual. Haven't had any starting issues, F1 light resets itself every time I shut bike off. Any body got any ideas before I start pulling tuperware off to get to the top of the engine?



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Re: 2003 1800 ECT fault

Post by GoldWingrGreg » Mon Jul 30, 2018 12:43 am

Code 7 sucks because both the shelter and cowl has to be removed for proper diagnosis. Once the cowl is off, unbolt the left radiator's 2 mount bolts and lift up and nylon tie it the handle bar for access. The stay under the rad will then need removed. That will give you access to get to the ETC's connection for diagnosis.

The sensor has 2 halves. One of its circuits sends a signal to the temp gauge, the other sends a signal to the ECM. Your diagnosis will be the ECM side. Follow the diagnosis in the Service Manual.

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patoy
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Re: 2003 1800 ECT fault

Post by patoy » Mon Jul 30, 2018 9:47 am

Not really what I wanted to hear but thanks for the info. Is it normal for the fault code to clear when the ignition is turned off?

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Re: 2003 1800 ECT fault

Post by GoldWingrGreg » Mon Jul 30, 2018 10:12 am

Actually, the fault code did not clear, it is still stored in the ECM. However, the FI light lights when the fault is occurring and will stay on until the ignition switch is cycled off. If the fault is still there when the ing switch is cycled back on, then it will light again. There is a procedure in the Service Manual > Fuel System > self-diagnostic memory reset procedure (pg 5-9 in the manual I'm looking at) on how to clear the code out of the ECM. Before you clear the memory, be sure to read any others that might be present.

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Kurt J
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Re: 2003 1800 ECT fault

Post by Kurt J » Mon Jul 30, 2018 6:20 pm

Mine was doing the same thing. It was the eng kill switch on the handle bars was dirty. Flip the switch back and forth a few times and it never happen again. I took it aprt and did clean it though......might give it a try.
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Re: 2003 1800 ECT fault

Post by GoldWingrGreg » Tue Jul 31, 2018 7:53 am

Kurt J wrote:
Mon Jul 30, 2018 6:20 pm
Mine was doing the same thing. It was the eng kill switch on the handle bars was dirty.
Your kill switch was causing code 7 ???

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Re: 2003 1800 ECT fault

Post by Kurt J » Tue Jul 31, 2018 9:00 am

GoldWingrGreg wrote:
Tue Jul 31, 2018 7:53 am
Kurt J wrote:
Mon Jul 30, 2018 6:20 pm
Mine was doing the same thing. It was the eng kill switch on the handle bars was dirty.
Your kill switch was causing code 7 ???
I don't beleave it was Greg. It was throwing 3 different codes. Codes where saying Injectors where all inop and fuel pump. These are all killed when you flip the kill switch. I just offered this suggestion as a quick check. Some times it is something real simple knocking out some of the bigger items on the bike.
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Techdude2000
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Re: 2003 1800 ECT fault

Post by Techdude2000 » Tue Jul 31, 2018 10:16 pm

I’m guessing this won’t be an actual ECT failure. A bad ECT won’t make the bike die, it usually makes it hard to start. I’m going to guess it’s either a bad connection in the engine sensor loop or a ECM going bad.

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Re: 2003 1800 ECT fault

Post by patoy » Wed Aug 01, 2018 12:29 am

I'm having trouble correlating the ECT fault with the missing and stalling also. I'll try the kill switch, and the ECM connections under the seat before I go further, maybe I'll get lucky. Either way it'll be a week or two until I can do anything but I'll update when I do anything.

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Re: 2003 1800 ECT fault

Post by GoldWingrGreg » Wed Aug 01, 2018 7:30 am

patoy wrote:
Wed Aug 01, 2018 12:29 am
I'm having trouble correlating the ECT fault with the missing and stalling also. I'll try the kill switch, and the ECM connections under the seat before I go further, maybe I'll get lucky. Either way it'll be a week or two until I can do anything but I'll update when I do anything.
Maybe 2 years ago, if I recall correctly, I had one that had both your symptoms (code 7 and stalling). On the one I worked on, code 7 was due to a high resistance in the ground side of the temp sensor circuit that goes to a common crimp in the harness. Unfortunately, other sensor in the PGM-FI system use the same crimp for ground; thus, causing the dying.

Hopefully Rob will walk you through the testing needed.

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Re: 2003 1800 ECT fault

Post by patoy » Fri Aug 10, 2018 9:11 pm

Hopefully I'm not speaking too soon but it looks like I got lucky and the easy fix worked. I cleaned the kill switch, and all the other switches in the rt handlebar group. Gone about 180 miles so far and no further problems. As a bonus I got my cruise on-off switch freed up (again).

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Re: 2003 1800 ECT fault

Post by GoldWingrGreg » Fri Aug 10, 2018 9:47 pm

Be sure to update us if things change.

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Re: 2003 1800 ECT fault

Post by patoy » Fri Aug 10, 2018 11:13 pm

Will do! Got this bike about a year and a half ago, found this forum not long after and have been reading and learning a lot from it. Have made several mods and upgrades often based on what I discovered here. My wife and I recently made a trip of over 3400 miles and had a blast, no problems at all with the bike.

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Re: 2003 1800 ECT fault

Post by Kurt J » Sun Aug 12, 2018 9:51 am

patoy wrote:
Fri Aug 10, 2018 9:11 pm
Hopefully I'm not speaking too soon but it looks like I got lucky and the easy fix worked. I cleaned the kill switch, and all the other switches in the rt handlebar group. Gone about 180 miles so far and no further problems. As a bonus I got my cruise on-off switch freed up (again).
/quote]

Like I said..." some times it is a simple thing". From time to time just reach up and use the kill switch to shut the motor down. I was just shutting the bike off with the key and never used the kill switch. The contacts in the kill switch got all gummed up and lost contact and the bike would die. Now I use the kill switch from time to time to keep the contacts in the switch clean. :D
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Re: 2003 1800 ECT fault

Post by patoy » Sat Aug 18, 2018 4:43 pm

My problem came back. Rode to work the other day and F1 came on again, minor drivability issues, got to work and put down kickstand and got multiple codes this time. Rode home from work and had F1 light come on again, got home and it spit out 4 or 5 repeats of same code. Did some more reading and realized I had been mis-reading the codes all along. What I took to be a 7 was actually 26. The multiple codes I got at work were 25, 26, and 27. When I got home they were all 26. Cleaned the switches in the left handlebar group again and rode to work, no light going or coming home, however, a couple miles from the house it started missing and stalled at a stop. Pulled into the garage and put down kickstand and no code. Got the bike in the shop now and pulled the seat to read any stored codes and see what was there but the green/black is non-existent. I have a green/brown 3P connector in the left group in a dust boot that looks to be what I'm looking for but I'm reluctant to short it cause colors don't match what is called for in the service manual. I verified that my bike is an '03, manufactured in 4-02. Is a variation of wiring color a reasonable situation to find?

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Re: 2003 1800 ECT fault

Post by Kurt J » Sat Aug 18, 2018 5:53 pm

Sounds like you still have a simple problem causing your issues. There are 2 things you can by pass with a jumper wire to see if the problem goes away. Try unplugging the eng kill switch where it connects to the harness. Take a jumper wire across the harness plug. If it keeps running then the kill switch is bad. You can also do this to the kick stand switch. BUT first see if the kick stand switch is adjusted right with the kick stand in the up position. If it is out of adjustment the vibration from the road or bumps in the road will cause it to kill the motor thinking that the kick stand is down. If it looks good then unplug it and jump the wiring harness side of the plug and see if the bike dies. Do one at a time and see if the bike dies.....if it does not then you found the bad switch causing the problem. Try the kick stand switch first....easier to get at. Your ECU plug should be under the seat just like mine. Mine was in side the large wiring harness rubber boot cover just below the fuse blocks......beleave I had to dig back into it to find the plug......:/
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Re: 2003 1800 ECT fault

Post by patoy » Sat Aug 18, 2018 6:58 pm

The only times it dies is when I pull up to a stop and the engine idles down too low due to rough running and stalls, starts right back up. Know anything about the question on the wire colors on the service check connector? The only 3P connector under the seat is with a group of other unused( female connectors not connected to anything) connectors in the open ended dust boot to the left of the relay box, it has a green and brown wire instead of the green and black wire designated in the service manual. The kickstand switch doesn't make until the stand is about halfway down.

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Re: 2003 1800 ECT fault

Post by Kurt J » Sat Aug 18, 2018 8:12 pm

The things I have suggested are about the only things I can think of at this time. I did get it from the folks here so I thought I would just repeat them for you to check. There are better folks here than I am......maybe one of them will jump in and offer a suggestion
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Re: 2003 1800 ECT fault

Post by Techdude2000 » Sat Aug 18, 2018 11:47 pm

patoy wrote:
Sat Aug 18, 2018 4:43 pm
My problem came back. Rode to work the other day and F1 came on again, minor drivability issues, got to work and put down kickstand and got multiple codes this time. Rode home from work and had F1 light come on again, got home and it spit out 4 or 5 repeats of same code. Did some more reading and realized I had been mis-reading the codes all along. What I took to be a 7 was actually 26. The multiple codes I got at work were 25, 26, and 27. When I got home they were all 26. Cleaned the switches in the left handlebar group again and rode to work, no light going or coming home, however, a couple miles from the house it started missing and stalled at a stop. Pulled into the garage and put down kickstand and no code. Got the bike in the shop now and pulled the seat to read any stored codes and see what was there but the green/black is non-existent. I have a green/brown 3P connector in the left group in a dust boot that looks to be what I'm looking for but I'm reluctant to short it cause colors don't match what is called for in the service manual. I verified that my bike is an '03, manufactured in 4-02. Is a variation of wiring color a reasonable situation to find?
I’m sorry to say it, but a 26 code and bad running after it gets warmed up, points to a bad ECM. The 26 code is for one of the knock sensors, but if the knock sensor actually goes bad, it won’t cause the engine to run badly. This set of symptoms is a bad ECM 99.9% of the time. This is becoming a common failure on the 01-05 wings.

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Re: 2003 1800 ECT fault

Post by patoy » Sun Aug 19, 2018 6:13 pm

Bike was due for a service anyway so I pulled it in the shop, changed oil and plugs (plugs were uniform but definenitly worn). Eventually figured out which connector to use and checked codes in memory. Wow! Memory pulled up codes 11 thru 18 and 21 thru 27, that list may no be exact but it's close, hard to keep track with so many. Cleared memory and started digging into the plastic, got to the air filter and found a large mouse nest complete with one dead mouse. Pulled the air box out to check underneath for other mouse sign but found no further indication of mouse nesting/chewing of wiring, etc. Made some mouse screens and installed on intake ducts. Took apart the right switch cluster on the handlebar and eliminated the kill switch issue with a little solder and heatshrink (bypassed the switch permanently). Got a new air filter on order, be here late next week. Maybe switch bypassing/ mouse nest removal/ new plugs/ code clearing/ reinitializing ecm after battery disconect will cure what ails her. If not may have to spring for a new ecm. At the very least I'm learning a lot about the bike :shock:

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Re: 2003 1800 ECT fault

Post by patoy » Sun Aug 19, 2018 6:42 pm

Was just looking at another post and noticed that Greg listed the original ECM as 38770
MCA 670, mine is a 38770 MCA 305, apparently it's been changed at least once already according to that.

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Re: 2003 1800 ECT fault

Post by Techdude2000 » Sun Aug 19, 2018 8:48 pm

patoy wrote:
Sun Aug 19, 2018 6:42 pm
Was just looking at another post and noticed that Greg listed the original ECM as 38770
MCA 670, mine is a 38770 MCA 305, apparently it's been changed at least once already according to that.
Yes, the 305 version was part of the overheat recall. It could have been the one they put in it at the factory. It changed the mixture a little and actually killed a little of the horsepower. People who had a 2001 that had the recall done and the ECM change performed, claim it slowed the bike down a little on the acceleration side of things. Don’t know if it changed much on the 02 and 03 years.

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Re: 2003 1800 ECT fault

Post by GoldWingrGreg » Mon Aug 20, 2018 2:05 pm

patoy wrote:
Sun Aug 19, 2018 6:42 pm
Was just looking at another post and noticed that Greg listed the original ECM as 38770
MCA 670, mine is a 38770 MCA 305, apparently it's been changed at least once already according to that.
It even gets more confusing. Honda's new part number ends in 38770-MCA-P00, and that's what'll be on the packaging that the new ECM is wrapped in. However, when you pull the ECM out, the sticker on the ECM will be 38770-MCA-305 and not P00.

As for the 01-03 being fastest ... that's because they are !!!

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Re: 2003 1800 ECT fault

Post by patoy » Sun Sep 02, 2018 11:46 am

Got the new air filter and installed it. There was an audio cable extension with exposed male ends connected to the radio aux input that was laying loose on top of the motor, I removed extension and routed aux input to left console box where it belongs, and also disconnected the power leads going to trailer light system (don't have a trailer anyway). End result of my repairs and such is that I've put just under 400 miles on it with no further missing, stalling, or nasty F1 errors. I'm confident that the culprit was the kill switch all along, got a positive reaction when I cleaned it both times, although short lived, and 400 miles worth of positive result after bypassing the switch. Once I got under the plastic and was able to adjust the throttle cable enough to remove the switch cluster from the handlebar I was able to see that someone had applied some kind of heavy yellow grease to the throttle cables and it was all over the inside of the switch cluster. Probably what got the kill switch. Hopefully won't need any further updates to this post due to a recurrence.

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Re: 2003 1800 ECT fault

Post by Kurt J » Mon Sep 03, 2018 9:22 am

Very nice. Just use your kill switch from time to time to kill the motor......it will keep the contacts clean.


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