https://www.planetnautique.com/vb5/ vBulletin Forums en Sun, 21 Jun 2026 21:11:58 GMT vBulletin 60 https://www.planetnautique.com/vb5/images/misc/rss.png https://www.planetnautique.com/vb5/ https://www.planetnautique.com/vb5/forum/nautique-topics/maintenance-technical-discussion/691378-misfire-on-pcm-h5 Sun, 21 Jun 2026 00:40:45 GMT
Cylinder 1 Misfire on PCM H5DI 5.3L — DTC 1311 & DTC 301




Hey everyone. I have a 2018 Nautique G21 with the PCM H5DI 5.3L direct injection engine and I'm chasing down a cylinder 1 misfire. Looking for anyone who's dealt with something similar.




THE ISSUE:

Engine runs fine at idle and low RPM, but after about 5 minutes of running under load at higher RPM, I get two fault codes:

- DTC 1311 — Cylinder 1 Misfire Detected

- DTC 301 — Cylinder 1 Emissions Catalyst Damaging Misfire




The fault log shows this code has occurred 127 times, so it's clearly been happening for a while.




WHAT I'VE ALREADY CHECKED:

- Replaced the spark plug on cylinder 1 — plug looked clean and dry, no fouling or oil

- Inspected and cleaned the spark plug wire with contact cleaner

- Plug well looked normal




BACKGROUND:
I recently bought this boat, knowing that had an issue with the NSS, which turned out to be the LINC panoray set to the wrong boat model. (I suspect the screen had been replaced before)
I also previously had DTCs for high side injector faults on multiple cylinders, which turned out to be caused by corrosion on a single pin on the ECM connector. Cleaned it up and that resolved those codes. Not sure if this current misfire is related or not — all the other ECM pins look completely clean, so it may be a separate issue.




MY CURRENT THEORY:

Given that it only misfires under load at higher RPM and runs fine at idle, I'm leaning toward either a weakening coil pack that can't keep up at higher firing frequency, or corrosion in the wiring between the ECM and the coil pack on cylinder 1. The boat has a history of water/storm damage so corrosion throughout the electrical system is a known issue.




Has anyone experienced this specific misfire pattern on the H5DI? Any tips on testing the coil pack or the signal wire without pulling the intake manifold would be greatly appreciated.




Thanks]]> Maint. / Tech. Discussion nathandantzler https://www.planetnautique.com/vb5/forum/nautique-topics/maintenance-technical-discussion/691378-misfire-on-pcm-h5 https://www.planetnautique.com/vb5/forum/nautique-topics/show-us-your-nautique/691365-2004-sante-all-black-hull Sat, 20 Jun 2026 15:24:27 GMT ]]> Show Us Your Nautiques thurobred1320 https://www.planetnautique.com/vb5/forum/nautique-topics/show-us-your-nautique/691365-2004-sante-all-black-hull https://www.planetnautique.com/vb5/forum/other-related-topics/trailer-discussion/691359-adjust-trailer-bunk-position-diy Sat, 20 Jun 2026 12:54:42 GMT My 2005 Nautique SV-211 has two ballast hull intake scoops that sit right above one of the custom-made trailer bunks. Unfortunately I live in SD and...


image widget]]> Cataractdaddy https://www.planetnautique.com/vb5/forum/other-related-topics/trailer-discussion/691359-adjust-trailer-bunk-position-diy https://www.planetnautique.com/vb5/forum/nautique-topics/maintenance-technical-discussion/691352-97-nautique-now-steers-backwards Sat, 20 Jun 2026 01:40:55 GMT
I can't imagine the unit could be installed any other way.

I'll get under there in the morning but can that rack be reversed?]]> Maint. / Tech. Discussion nhhandyman https://www.planetnautique.com/vb5/forum/nautique-topics/maintenance-technical-discussion/691352-97-nautique-now-steers-backwards https://www.planetnautique.com/vb5/forum/nautique-topics/maintenance-technical-discussion/691335-breaker-switch-repl-89-nautique Fri, 19 Jun 2026 18:48:20 GMT Breaker/switches for the bilge pump on my 89 Nautique are failing. Are there reliable replacements in the $5 range? Correct Craft wants $25 each. Breaker/switches for the bilge pump on my 89 Nautique are failing. Are there reliable replacements in the $5 range? Correct Craft wants $25 each. Maint. / Tech. Discussion Grampa Bill https://www.planetnautique.com/vb5/forum/nautique-topics/maintenance-technical-discussion/691335-breaker-switch-repl-89-nautique https://www.planetnautique.com/vb5/forum/nautique-topics/maintenance-technical-discussion/691317-2000-ski-nautique-engine Thu, 18 Jun 2026 13:48:54 GMT
]]> Maint. / Tech. Discussion Weiser https://www.planetnautique.com/vb5/forum/nautique-topics/maintenance-technical-discussion/691317-2000-ski-nautique-engine https://www.planetnautique.com/vb5/forum/nautique-topics/general-nautique-discussion/nautique-cc-boat-restorations/691313-2006-air-210-team-rebuild Thu, 18 Jun 2026 11:42:19 GMT Hi all, First post, but have been lurking for a while. Will start this thread as a place to document the rebuild of our 210. Had since new and...
First post, but have been lurking for a while.

Will start this thread as a place to document the rebuild of our 210. Had since new and was delivered Christmas 2005. Was always a dream to own an OG 210 growing up wakeboarding so we pulled the trigger once Nautiques announced its final production year. Lots of great memories, and many more to come. Co-owned with my brother, and he is the chief in this project. I’m just the cheap labour.

pic of the day of delivery, was a nice Christmas present

]]> haven_snickers https://www.planetnautique.com/vb5/forum/nautique-topics/general-nautique-discussion/nautique-cc-boat-restorations/691313-2006-air-210-team-rebuild https://www.planetnautique.com/vb5/forum/other-related-topics/stereo-accessories/691309-subwoofer-working-at-approximately-50 Wed, 17 Jun 2026 21:26:29 GMT
I have a 2023 GS22 and when I got it back from storage this spring the sub wasn't working at all. Volume settings on the head unit and LINC Panoray looked normal across the tower, cabin speakers, and sub. All wiring appeared firmly connected and both amps had solid green lights.

I turned the battery switch off and reset the breaker near the battery switch — after that it came back and worked fine. A few days later it started acting up again, this time running at roughly 50% output. I can feel it working but it's noticeably weak. Tried the breaker reset again with no luck this time.

I've reached out to my dealer but haven't heard back yet. Has anyone run into this before? Any troubleshooting tips or leads on what might be causing it would be really appreciated.]]> Stereo / Lighting / Accessories WPABoater https://www.planetnautique.com/vb5/forum/other-related-topics/stereo-accessories/691309-subwoofer-working-at-approximately-50 https://www.planetnautique.com/vb5/forum/nautique-topics/maintenance-technical-discussion/691305-2nd-battery-location-options Wed, 17 Jun 2026 18:12:32 GMT Have a 2002 SAN 210 with a single battery under the rear port side seat. Wanting to add a second battery plus the blue seas add a battery kit for an... Have a 2002 SAN 210 with a single battery under the rear port side seat. Wanting to add a second battery plus the blue seas add a battery kit for an upgraded stereo. Where are you guys mounting this second battery for the ones who have? Thanks Maint. / Tech. Discussion ty151 https://www.planetnautique.com/vb5/forum/nautique-topics/maintenance-technical-discussion/691305-2nd-battery-location-options https://www.planetnautique.com/vb5/forum/classified-group-buy-section/gear-for-sale-by-owner/gear-wanted/691300-mooring-cover-wanted-2018-nautique-g21 Wed, 17 Jun 2026 16:34:43 GMT I live in Nashville, but will pay for shipping if needed.

818-371-2739]]> Gear Wanted nathandantzler https://www.planetnautique.com/vb5/forum/classified-group-buy-section/gear-for-sale-by-owner/gear-wanted/691300-mooring-cover-wanted-2018-nautique-g21 https://www.planetnautique.com/vb5/forum/classified-group-buy-section/gear-for-sale-by-owner/691287-new-perfect-pass-5-display Tue, 16 Jun 2026 18:21:57 GMT
Unit was removed from a complete, never used Perfect Pass Stargazer installation kit as the kit buyer needed the smaller 3.5" gauge. The Stargazer kit was 'new old stock' from 2020.

The covering you see in the pictures on the LCD display is from the factory. Unit was only removed from the factory bag for these photos.

Selling $190 which includes US ground shipping.

Pictures are of actual unit you will receive.





]]> Gear For Sale SilentSeven https://www.planetnautique.com/vb5/forum/classified-group-buy-section/gear-for-sale-by-owner/691287-new-perfect-pass-5-display https://www.planetnautique.com/vb5/forum/other-related-topics/stereo-accessories/691286-stereo-upgrade-questions-2002-san Tue, 16 Jun 2026 16:11:00 GMT
Picked up a 2002 SAN 210 this past weekend and it’s in need for some help in the audio section. I have been going back and forth about what direction I want to go with it. I’m looking to add some good quality sound that is clear and has some good bass. I have young kids and I don’t typically blast my music so I’m more interested in good quality sound.

It still has the stock 6 in boat speakers and an older Kenwood head unit. The previous owner had an older Pioneer Premier 12” sub in a box just on the floor behind the driver seat but I have removed that. I want that space open for a cooler/bags, etc. it also has an older set of Infinity tower speakers but those will be removed. Under the helm is an infinite amp ( assuming for towers) and an older JL e1200 amp that I believe was for the sub.

My plan is to upgrade the 6 in boat speakers with something decent. Not planning to spend a ton of money, because I’m sure anything new will sound better than stock. I’ve looked at JL, Rockford, and entertained some of the lower wetsounds options.

I also want to add a sub, not sure of 10” or 12” due to space. Where are you guys mounting these? I’m coming from a much newer and
bigger boat so space is already very limited. I’d like to avoid filling the observer seat storage completely with a sub box.

As for the amp, I’m thinking a 5 or 6 channel amp to power the in boat speakers and sub. What do you guys think?

im going to wait on towers at this time because we dont really wake board often and dont have the need for sound projection. We’re typically in the boat or have a Bluetooth speaker when in the beach.

looking for some opinions on speakers and how you guys mount them? Keep the mesh speaker cover or mount on top of the combing pad? Also, sub suggestions and mounting locations? Also wanted to update the head unit if it is in the budget but the Kenwood may work for now since it has Bluetooth. Thank you all! ]]> Stereo / Lighting / Accessories ty151 https://www.planetnautique.com/vb5/forum/other-related-topics/stereo-accessories/691286-stereo-upgrade-questions-2002-san https://www.planetnautique.com/vb5/forum/nautique-topics/maintenance-technical-discussion/691281-ecm-wiring-tool-wiring-diagrams Tue, 16 Jun 2026 14:53:56 GMT
I recently picked up a 2018 G21 with the PCM H5 and ran into a serious issue on my first time out — four simultaneous DTC codes (2261, 2270, 2276, 2279) for Direct Injector High Side Short to Ground on cylinders 1, 4, 6, and 7. Engine ran rough and I had to limp back to the dock at 1200 RPM.

During the diagnostic process, one of the most frustrating things was the complete lack of publicly available wiring information for the H5/H6. No pinout diagrams, no ECM connector maps — all dealer-only through Diacom. I called PCM and was able to track down the official PCM wiring schematics and am attaching them to this post as a PDF for anyone who needs them. These cover the full H5 and H6 (5.3L / 6.2L DI) engines including injectors, ignition coils, sensors, throttle body, relays, fuel pump, O2 sensors, grounds, and power circuits.

I also took those diagrams and built an interactive web tool that makes them easier to navigate. Click any component and it highlights the ECM pins associated with it. Click any pin on the ECM connector grid and it tells you exactly what it controls and what circuit it belongs to. No more guessing or scrolling through pages of schematics.


https://pmc-h5-h6-wiring-tool.netlify.app/


A few notes:
— The attached PDF contains the original PCM wiring diagrams (DI_NA_PCM001 through PCM016) — use these as your source of truth
— The web tool is built from those same diagrams and is meant to make them faster to navigate in the field
— Built for the H5 and H6 specifically, but may also apply to other PCM DI engines sharing the same E92 ECM architecture — Centurion and Supreme owners with the same platform may find this useful too
— Works on desktop and mobile

Hope this saves someone else hours of head-scratching. If you spot any errors or have additional diagram pages to contribute, let me know and I'll update the tool.

Nathan]]> Maint. / Tech. Discussion nathandantzler https://www.planetnautique.com/vb5/forum/nautique-topics/maintenance-technical-discussion/691281-ecm-wiring-tool-wiring-diagrams https://www.planetnautique.com/vb5/forum/classified-group-buy-section-aa/trailers-wanted/691279-2018-g25-trailer-needed-asap Tue, 16 Jun 2026 14:03:37 GMT Please let me know, thanks! Please let me know, thanks! Trailers Wanted colemars https://www.planetnautique.com/vb5/forum/classified-group-buy-section-aa/trailers-wanted/691279-2018-g25-trailer-needed-asap https://www.planetnautique.com/vb5/forum/nautique-topics/general-nautique-discussion/691272-2008-2012-nautique-230-upholstery Tue, 16 Jun 2026 00:51:54 GMT
I'm replacing the upholstery on the front bow nose bolster and already have a new cover ready to install. To remove the panel, I pulled the lower bow seat cushion and reached behind the fiberglass cap, expecting to find through-bolts with nuts securing the bolster. Instead, I found what appears to be approximately 10 fasteners that look like screws threaded directly into the fiberglass cap, with no retaining nuts visible on the backside.

What has me confused is that I can't find any obvious way to access the screw heads. There doesn't appear to be a seam or opening in the upholstery where a screwdriver could be inserted, and from the backside there are no nuts or other hardware to remove. I've removed the seat base and can partially reach the back side of the bow cap from underneath. I can also almost get my hand up there through the speaker openings in the adjacent port and starboard bow bolsters, but I still can't determine how the panel is actually attached or how Nautique installed it at the factory.

Has anyone removed this bolster before? Are the screws hidden behind the vinyl and intended to be pierced during installation, or is there another attachment method I'm overlooking? Any tips, photos, or insight into the factory installation process would be greatly appreciated before I start pulling on things and risk damaging the fiberglass or upholstery.

Thanks in advance.]]> General Nautique Discussion Credo184 https://www.planetnautique.com/vb5/forum/nautique-topics/general-nautique-discussion/691272-2008-2012-nautique-230-upholstery