Ignition Failure& Repair, Mercury Marine Mercruiser Inboard Engine: CodeMate Diagnostic Code 45

Links Below: My Mercruiser Inboard Engine left me stranded for the 2nd time in 26 years. This time was an ignition system failure code 45 determined by using a CodeMate Diagnostic Tool. The engine would crank, start and stall. Issue started with a rough running engine at low idle / load. This engine is an MIE 350 MAG MPI Ski.

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00:00 Intro: Mercruiser Crank, Start, Stall
01:55 CodeMate Diagnostic Tool For Marine Engines
03:29 How To Use CodeMate Diagnostic Marine Scanner
04:07 Open Box Of Mercruiser Ignition Coil and Ignition Control Module (ICM)
04:42 Location Of Coil & ICM Mercruiser Inboard
05:33 Incorrect or Inaccurate Information On The Internet
06:35 How To Replace Mercruiser Ignition Coil
08:16 How To Test Mercruiser Ignition Coil
09:15 Didn't Quite Fix All Issues!
09:54 Mercruiser Hall Effect Ignition Sensor Failure & Operation
10:46 How To Replace Mercruiser Hall Effect Sensor

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CodeMate Compatibility:

MerCruiser: 4.3L, 5.0L, 5.7L, 7.4L, 8.2L ('92–'01, MEFI-1 to MEFI-4)
Volvo Penta: 4.3L, 5.0L, 5.7L, 7.4L, 8.1L, 8.2L ('92–'05, MEFI-1 to MEFI-4)
Indmar: 4.3L, 5.0L, 5.7L, 7.4L ('92–'06, MEFI-1 to MEFI-4)
Pleasurecraft (PCM): 5.0L, 5.7L, 7.4L ('92–'06, MEFI-1 to MEFI-4)
Crusader, Marine Power, Kodiak: Similar GM-based EFI engines ('92–'05, MEFI-1 to MEFI-4)

Mercruiser Tech Support: 920-929-5040
https://www.mercurymarine.com/us/en/about-us/contact-us

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Disclaimer: This video is for informational purposes only. I make no warranty, express or implied, on effectiveness or safety. Do not attempt repairs—seek a licensed auto professional. I’m not liable for injury, damage, or loss from using tools, equipment, or content. Product links are informational, not endorsements. Viewer releases Driving Intelligence from liability, claims, or actions related to this video’s use, to the fullest extent allowed by law.

Driving Intelligence is your go-to for #DIYAuto! Learn hacks to keep old vehicles running better with improved #fueleconomy, #autocomfort, and #cartech—think upgraded stereos, performance parts, sound deadening, and interior updates. We reclaim recycle center finds, review automotive/marine products, showcase tools, and tackle home repairs. Perfect for first-time DIYers! Subscribe for practical tips to revive your ride! #MerCruiser57LEFI #ThunderboltVIgnition #MarineEngineRepair #LowRPMMisfire #CrankNoStart #MerCruiserStallFix #SangerBoatRepair #IgnitionCoilReplacement #DistributorCapRepair #ECM555Diagnostics #marinerepair #MarineMaintenance

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