Mercury Sterndrive Trim Relay Fault Code

[delsol88]

Title: Mercury Sterndrive Trim Relay Fault Code

I have a powerboat with 2 Mercury Sterndrive TDI 3.0L Diesel Engines with Bravo 3.

Recently, whenever I start my port engine, it starts and run for 3 minutes before the following fault code pops up, and then the port engine shuts down automatically.

Fault Code: 3181-16
Trim up relay is not working properly

Fault Code: 3182-16
Trim down relay is not working properly

Fault Code: 623-21
Driver Power Voltage is below normal limit

Mercury technician has checked both port/sb starting batteries and trim relay. They all work okay.

Would like to pick you guys brains regarding possible causes and fixes. Greatly appreciated.

 

[alldodge]

Welcome
Assuming this is Axius and most likely the voltage low fault is what's causing the issue(s). Disconnect the trim sensor to see if the low voltage fault clears. There will be other faults doing this but should clear when reconnected

You and the Tech need the diagnostics manuals to determine what's wrong. I'll see if @muc has an idea, but will need serial numbers of the motor and drive

 

[muc]

Fault Code: 623-21
Driver Power Voltage is below normal limit

This is a critical fault! Always address critical faults first --- will probably fix the trim faults when the low voltage is taken care of.

Serial numbers might help, but I've never worked for a MerCruiser Diesel dealer and never seen these engines. Not even sure if I could access the manuals.

These fault codes that come thru a gateway like you're showing can sometimes be wrong. In school we were told to pay attention to the words more then the numbers.

And maybe move this to MerCruiser forum?

 

[delsol88]

Thanks guys @alldodge @muc
Will update you of any further developments.