2012 GL1800 FI code 19, then on solid. loose connection(s) somewhere?


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danleonard1954
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2012 GL1800 FI code 19, then on solid. loose connection(s) somewhere?

Post by danleonard1954 »



Hello! My 2012 failed to start (a year ago, single occurrence), after 15-20 minutes of cranking, eventually started. Recently the problem returned, this time showed a FI 19, Crank Position Sensor fault. I started into the investigation by removing the top black plastic cowl, and confirmed the FI 19 was still occurring several times. I gently wiggled the wire harness at the top-left side of the area behind the removed cowling, where it seemed that the CKP wire ran. This little wiggle changed the FI code to what I recall a year ago - FI lite on solid, not blinking. I am suspecting that both faults may be related to a corroded connection somewhere. I think the solid FI lite indicates a 'loose power or ground connection' to the ECM. I hate to admit it, but when the problem happened last year I did not try to decode the FI lite, but from memory it was on 'solid' then.

Before this happened, I was considering replacing the air filter - I may start that process and see if I can find a loose ECM / CKP in the wire harness along the way?
Advice is appreciated. How does one track down a suspected wire harness issue other than head toward the red CKP connector and/or the ECM connector and see what I can see?


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MikeB
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Re: 2012 GL1800 FI code 19, then on solid. loose connection(s) somewhere?

Post by MikeB »

Earlier this year, a friends 2016 had the no-start condition. He took it to a local Honda dealership and they diagnosed it as a crank position sensor (CPS) error and told him they fixed it and let him have it back.

It was good for two or three months and and then the problem returned.

I had a new CPS and a gasket for the engine cover so in March of this year we decided to take it apart and check the connector on the CPS and replace it. The connector looked perfectly good, no corrosion and it appeared that it had never been disturbed. Made us believe that the dealership hadn't done anything but take his money.

His bike doesn't have ABS so we removed the necessary plastic and engine cover and replaced the CPS. If it had ABS it would have been more involved. There has not been a problem with it since.

My recommendation to you would be to get a new CPS, engine cover gasket, and then replace the CPS and be done with it. You are going to take off the plastic to get to it anyway so you may as well do the complete job.
MikeB
1998 - GL1500 w/205,500 miles ~ 2017 - GL1800 w/46,000 miles
USAF Avionics Communications Tech - 1968 - 1986 / Flight Engineer C-130E - C-141B - 1986 - 1992. Retired
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GoldWingrGreg
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Re: 2012 GL1800 FI code 19, then on solid. loose connection(s) somewhere?

Post by GoldWingrGreg »

danleonard1954 wrote: Mon Aug 19, 2024 8:44 am How does one track down a suspected wire harness issue other than head toward the red CKP connector and/or the ECM connector and see what I can see?
Things to know ... DTC code 19 represents the crank position circute. The circute consists of the crank sensor, related wiring, and the ECM. 5th gens made in Japan (2012-17s), are more likely to have a bad crank sensor, and a person or shop, can spend lots of time trying to test and catch a failing sensor. When proper signal from the crank sensor does not make it to the ECM, the ECM cuts power to the fuel pump and the coils ... so not fuel pressure of spark.

Other then verifing that the crank sensor's connection is clean, and that the battery tests good, at least when paying labor charges, it is best to assume that the sensor is failing, and have it replaced. But be aware, that a failing or week battery will also cut power the fuel pump and ignition system. So never assume that having a new battery, or one that cranks over healthy, is good. It all starts with having the battery professionally tested at a pwersports dealer.
danleonard1954
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Re: 2012 GL1800 FI code 19, then on solid. loose connection(s) somewhere?

Post by danleonard1954 »

Well, I started with a FI code 19, which changed to a FI light on solid. As I worked toward identifying the cause - as luck would have it - the problem has gone away completely. I've continued disassembly toward replacing the air filter (long overdue) I have paused and wiggled each exposed portion of the wire harness, and restarted the engine multiple times without a single failure. I may consider coupling in a test lead near the ECM (+/- supply to ECM) to see if I can measure a voltage difference toward positive or ground, until the problem returns I'm at a loss.

Somewhere I read of a corroded battery ground connection causing an ECM hiccup like this. Advice is appreciated.
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MikeB
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1998 - GL1500 Aspencade
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Previous
SOLD 1999 - GL1500, 161K Miles
SOLD 2003 - GL1800 ABS w/117K - Sold
SOLD 2003 - GL1800 w/67K Miles
SOLD 2001 - ST1100 w/33K Miles
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Re: 2012 GL1800 FI code 19, then on solid. loose connection(s) somewhere?

Post by MikeB »

That all sounds very familiar to what my friend had on his 2016. Never could pin it down. The problem started on the day he bought it in September 2023. He took it to the dealer for repair. The dealer said it was the Crank Position Sensor. They supposedly fixed it and got their $125 fee. The problem would re-surface a couple more times and then go away.

Finally in March, it was down for the count. So, we replaced the crank position sensor and it has been good ever since.


MikeB
1998 - GL1500 w/205,500 miles ~ 2017 - GL1800 w/46,000 miles
USAF Avionics Communications Tech - 1968 - 1986 / Flight Engineer C-130E - C-141B - 1986 - 1992. Retired
Industrial Maintenance Tech - 1992 - 2014
Retired in Tacoma, WA
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