Check engine warning

[BGW]

Hi there,

My 2015 R27 (D3 200) with 1100 hr has a check engine warning that comes on almost immediately after startup. It will also come on around 2800 RPM at which point I throttle back. I’m not sure if it will do more but I’m not prepared to try.

The engine seems to have developed a vibration as well. More noticeable at idle.

I’ve changed all the batteries and voltage is good. I’ve changed oil and the oil filter. I’ve changed the fuel/water separator. Belts and tension seem fine.

I’m still getting the warning with fault code MID128 PSID129 4OCC Status Inactive.

Can you tell me what this corresponds to?


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[Osprey]

Best I can figure out from a web search is that your engine has an intake manifold pressure issue. This is based on the PSID 129 code of the MID 128 (Message Identification Information).

 

[BGW]

Thanks Osprey. I’ll try to pull the sensor and see if it needs cleaning.

 

[BB marine]

PSID 129 I believe is alternator. There are several secondary codes associated with that. Alternator over heat, low voltage, mechanical fault with alternator. I would do some troubleshooting on the alternator. If it comes on at a cold start it would not be a temperature issue. Most likely a voltage issue. Because of the higher temperatures in the compartment (poor compartment ventilation ) the alternators operate close to the max temp range specification. This could be an issue if it comes on with a start up of a warm engine.I would check all connections at the alternator for clean and tight condition. Check voltage at the battery not running, then while running the engine @ 1000+rpm. The voltage should be above 13.6 v after a few minutes. Battery voltage without running engine should be 12.6/12.7 fully charged battery. There are many other checks but these are the basics.

 

[BGW]

Thanks Brian,

I’ll try to check the alternator as suggested.

The warning appears within 30 seconds of starting the engine.

I just finished pulling the intake manifold sensor (under the ECU). Oddly enough there was no electrical cable running to it and no spare cable or connector that I could see. Is there meant to be one? There’s been no work done on the engine so if there was a cable that worked its way free, it would be lying there. There’s nowhere for it to fall.

 

[knotflying]

I seem to remember the idler pulley for tension on the alternator belt has been an issue in the past. Salt water dripping on it tends to cause corrosion and there has been failure. check that out as well and make sure it is moving freely.

 

[BB marine]

I'm not sure what sensor that is. The ECU should be mounted to the bulkhead in the engine compartment. The air temperature and pressure sensor should be located on the lower portion of the charge air tube near the starter.

 

[TBates]

Hi BGW,

I found a warning similar to what you listed below; you'll want to check the warnings manager next time the code appears to verify the code is the same:

MID 128, PSID 129, FMI 4

Fault code explanation: Electrical fault in alternator.
Fault indication: An orange lamp flashes in the alarm panel.
Symptom: Alternator voltage less than normal.
Conditions for fault code: Electrical fault in the alternator. Low phase voltage or short circuit detected.
Possible reason: • Interruption of excitation field.
• Short circuit of excitation field.
• Defect phase evaluation circuit.
Suitable action: 1 Check the charging voltage from the alternator and replace the
regulator if necessary. Please refer to Checking the charging
system, page 30.
2 Replace the alternator

Hope this helps a bit.

-Tim

 

[BGW]

I'm not sure what sensor that is. The ECU should be mounted to the bulkhead in the engine compartment. The air temperature and pressure sensor should be located on the lower portion of the charge air tube near the starter.

My bad Brian. I took a photo of what I thought was the ECU but can’t seem to upload it.

 

[BB marine]

There are two boxes on the top of the engine one is the

PCU
It communicates with the EECU and transmission and helm station control unit.


Voltage converter
The engine is equipped with a DC/DC converter. The DC/DC converter stabilize the voltage supplied to the EECU while cranking the engine .

I don't know what sensor you found that is not connected. If you find no connectors around it I would nor worry about that. It has operated fine for 1100 hours with out using it. I believe I would trouble shoot the charging system.