alarm

[kellertb]

my smartcraft engine alarm went off today and gave the message "limited engine power". shut the engines down and restarted. no problem after that. this is the third time or so during a two year period. the checklist on the smartcraft indicated that it was the port engine. all of the gauges were reading fine. any ideas?

 

[Presentation]

Connecting a scan tool would be needed to confirm the issue with certainty.


I scan will cost about $120 to $200.

If the fault is no longer active they should be able to retrieve the most recent faults from memory.

If you are doing it yourself with a borrowed scan tool and you can’t find the stored fault codes they are stored in the same memory location as the engine hour meter data.


Are you getting any beeping? Do you hear a beep when you fist flip the switch to start the motor?

Here are the codes:

 

[kellertb]

there is always a beep when the engines are started and there was a beep when the limited engine power fault was received. where did you get the table of faults and why do you think the limited engine power fault is missing?

 

[kellertb]

i was reading on another forum that the 8.1 HO engines typically have issues with IAC at about 200 hours. i have 215 hours and that could be the reason for the alarms. what are the IAC's, where are they located, where can i purchase them and what do they cost?

 

[Presentation]

there is always a beep when the engines are started and there was a beep when the limited engine power fault was received. where did you get the table of faults and why do you think the limited engine power fault is missing?

I got the table from the internet.

".. why do you think the limited engine power fault is missing?" What do you mean?








Edit: I kept wondering what you meant by this.
I think I got it.
I said above “If you are doing it yourself with a borrowed scan tool and you can’t find the stored fault codes they are stored in the same memory location as the engine hour meter data. “
If you go the route of connecting a Rinda electronic diagnostic scan tool to give you a definite answer as to why you are getting a beeping alarm and power loss there are two possibilities.
The fault is active. This means the beeping alarm is actively beeping.
The other possibility is the fault is not active. The alarm is not going off at the time you connect the scan tool.
If this happens how you do know what caused the alarm and power loss? Well, the smart craft system has a memory. It stores the most recent faults.
If you hire this done the technician should know and understand this. If you are doing it yourself using a borrowed scan tool I was simply giving you a tip.

 

[Presentation]

i was reading on another forum that the 8.1 HO engines typically have issues with IAC at about 200 hours. i have 215 hours and that could be the reason for the alarms. what are the IAC's, where are they located, where can i purchase them and what do they cost?

Its possible your issue is a bad IAC. Its on the top chart about 9 or so items down.

A bad IAC will cause a 2 beep alarm, the smartcraft system will create a power reduction and it is a simple do it yourself job.

I’ll post a follow up on its location and how to change.

I need to be clear, it could be other things. Changing the IAC for your described issue with no other symptoms is a educated guess, not a diagnosed solution.

 

[Presentation]

i was reading on another forum that the 8.1 HO engines typically have issues with IAC at about 200 hours. i have 215 hours and that could be the reason for the alarms. what are the IAC's, where are they located, where can i purchase them and what do they cost?

An idle air control valve or IAC for short is an electronic motor which adjusts the idle speed in motors with fuel injection. Some motors don't have IAC valves, instead they have a mass air flow sensor. Your motors and mine do have a IAC. An IAC valve is used by the computer to change the amount of air flow. We have one per motor.

Changing the IAC is as simple as removing the flame arrestor for easier access, find it, unplug it, take off two Allen head screws, remove the gasket then reverse the process with the new parts.

If you have the original IAC on your motor it will be black just like every other part of the motor. Your replacement will be shiny metal.

The IAC muffler filter is inside the throttle body assembly itself. You may need an needle nose pliers to pull it out. It may be very dirty and come out in pieces. Get all the pieces out. Gently push the new one in by hand with clean bare fingers.


Note: Part #38 is the IAC. I highlighted the filter #5, IAC #38 and gasket #37 below, the three parts you should be changing. Do not skip changing part #5.


This is for the Merc 8.1 HO motor. Do not use the below drawing for other motors.

1 866577A04 THROTTLE BODY ASSEMBLY $510.60
2 27-863215 GASKET, Throttle Body $4.55
3 853678T SENSOR, TPS, Includes O-Ring $83.00
4 10-853680 SCREW KIT $35.25
5 35-863829 MUFFLER, Intake Air Control $1.06
6 862999A3 PLUG KIT, Adaptor,Intake Air Control $14.50
7 25-808547 O-RING $0.65
8 25-863006 O-RING $1.01
9 22-863427 FITTING, Air Valve $2.45
10 10-805400 SCREW, (#8-32 x .500) Stainless Steel $0.65
11 863135 LEVER, Throttle $11.77
12 10-64014 SCREW, (.250-28 x .500) $1.20
13 16-863345 STUD, Special $6.62
14 863214 LINK $5.99
15 805533 SCREW, (M8 x 35) $8.61
16 8631541 ARM, Cable $12.38
17 10-863380 SCREW, Special $5.34
18 23-97896 BUSHING, Flanged $1.70
19 805398 PIN, Primary Linkage $8.46
20 16-805526 STUD, (.250-28 x 1.540) $2.67
21 12-20533 WASHER $3.00 (Pack of 5)
22 11-8267139 NUT, (.250-28) $0.98
22 11-826709109 NUT, (.250-28) Stainless Steel $6.16 (Pack of 5)
23 11-863289 NUT $1.08
24 16-802561 STUD $6.71
25 863153 BRACKET, Throttle Cable Attaching $13.92
26 10-4006731 SCREW, (M6 x 16) $1.06
27 23-863734 SPACER $8.38
28 16-97477A3 STUD KIT $18.80
28 16-866641A01 STUD KIT $8.90
30 23-31866 SPACER, (.256 x .313 x .625) $6.77 (Pack of 3)
31 12-20533 WASHER $3.00 (Pack of 5)
32 11-8267139 NUT, (.250-28) $0.98
32 11-826709109 NUT, (.250-28) Stainless Steel $6.16 (Pack of 5)
33 32-864262 HOSE, Air Bypass $37.94
34 54-815504206 CLAMP, Worm Gear $2.81
NS 19-8079923 COVER, Hose Clamp End $6.56 (Pack of 20)
35 27-863285 GASKET, Air Valve $8.56
36 10-40011151 SCREW, (M8 x 35) Stainless Steel $1.74
37 27-863112 GASKET, Idle Air Valve $1.04
38 862998 VALVE, Idle Air $87.40
39 10-4008820 SCREW, (M6 x 20) $1.06
40 54-863393 CLAMP, Flame Arrestor $10.54
41 863085T FLAME ARRESTOR $120.44
42 862996 BRACKET, Throttle Linkage $28.58
43 862997A1 MOUNTING PLATE, Intake Air Control $21.34




Shop around online to get the best pricing. I have found Boats.net to be pretty good but I am not affiliated with them so just check a few places.


PS: a spare IAC, gasket and IAC muffler filter + the tools to change are part of my onboard spares and tools.