Diacom Guru needed Dave_n?????
 

I was HAULIN' ACE today and I went into guardian mode, solid buzzer.

Here's my history file.....I think I went into guardian mode for low sea pump pressure but not sure. It looks like the cam, crank and map sensor all tripped at 109.77 hrs.

I came of plane and everything seemed OK, guages OK, ran back to the marina OK. I'm thinking I caught some grass or garbage on my water pickups.

DIACOM ® Diagnostic Status Report

09/08/2006 19:01:14


1. VEHICLE CONFIGURATION

Engine Make: N/A
Engine Serial No: N/A
Model Year: N/A
System Type: MerCruiser PCM555

2. PERFORMANCE DATA

Parameter Description Value Unit

Available Power 100 %
Baro Pressure 14.59
Battery Voltage 12.54
Coolant Temperature 140.00
Engine Speed 0 RPM
Fuel Flow Rate 0.00 GPH
Fuel Level 1022 #
IAC Duty Cycle 0.00
Lake/Sea Temp 431.60 °F
Manifold Absolute Pressure 14.57
Manifold Air Temperature 127.40
Oil Pressure 0.25
Paddle Wheel 0 Hz
Pitot ADC 0 #
Port Exhst Cool Temp 131.00
Sea Pump Pressure 0.66
Sensor Power 5.01 VDC
Spark Advance 6.00
Starb Exhst Cool Temp 129.20
Throttle Position 0.12
Throttle Sensor Voltage 0.59
Trim Position 0 #
Trim Volts 0.00 VDC

3. TROUBLE CODE STATUS

Current ECM Codes

Sensor Fault, click Read Fault button for details

Trouble Code List:
PITOT CKT LO Code is active
FUEL LVL CKT HI Code is active
STEER CKT HI Code is active
TRIM CKT LO Code is active
FUEL LVL2 CKT H Code is active

Freeze Frame Data:

0 OVERSPEED
--------------------------------------------------------------------
FF Baro Pressure 14.70 PSI
FF Battery Volts 14.43 VDC
FF Sea Pump Pressure 3.61 PSI
FF Boat Speed 2.00
FF Manifold Air Temp 125.60 °F
FF Coolant Temp 165.20 °F
FF Demand 1.13 %
FF Engine Speed 923 RPM
FF Engine State Running
FF FPC Total 39.4 Counts
FF Frequency Count 17
FF Fuel Level 0.00 %
FF Gear Position In Gear
FF Lake Temp 429.80 °F
FF Engine Load 16.79 %
FF Main Pwr Relay Requests 33812.0
FF Manifold Air Pressure 11.25 PSI
FF Oil Level 0.00 %
FF Port Tab Pos 0.32 %
FF Available Power 100 %
FF Run Time 110.93 hrs
FF Starboard Tab Pos 0.00 %
FF TPS Percent 1.13 %
FF Trim Position 0.00 %

1 TRIM CKT LO
--------------------------------------------------------------------
FF Baro Pressure 14.59 PSI
FF Battery Volts 12.38 VDC
FF Sea Pump Pressure 0.19 PSI
FF Boat Speed 0.00
FF Manifold Air Temp 118.40 °F
FF Coolant Temp 140.00 °F
FF Demand 0.12 %
FF Engine Speed 0 RPM
FF Engine State Stall
FF FPC Total 0.0 Counts
FF Frequency Count 885
FF Fuel Level 0.00 %
FF Gear Position In Gear
FF Lake Temp 431.60 °F
FF Engine Load 0.00 %
FF Main Pwr Relay Requests 32772.0
FF Manifold Air Pressure 14.59 PSI
FF Oil Level 0.00 %
FF Port Tab Pos 0.08 %
FF Available Power 100 %
FF Run Time 111.28 hrs
FF Starboard Tab Pos 0.00 %
FF TPS Percent 0.12 %
FF Trim Position 0.00 %

2 STEER CKT HI
--------------------------------------------------------------------
FF Baro Pressure 14.59 PSI
FF Battery Volts 12.36 VDC
FF Sea Pump Pressure 0.34 PSI
FF Boat Speed 0.00
FF Manifold Air Temp 123.80 °F
FF Coolant Temp 140.00 °F
FF Demand 0.12 %
FF Engine Speed 0 RPM
FF Engine State Stall
FF FPC Total 0.0 Counts
FF Frequency Count 876
FF Fuel Level 0.00 %
FF Gear Position In Gear
FF Lake Temp 431.60 °F
FF Engine Load 0.00 %
FF Main Pwr Relay Requests 32772.0
FF Manifold Air Pressure 14.58 PSI
FF Oil Level 0.00 %
FF Port Tab Pos 0.19 %
FF Available Power 100 %
FF Run Time 111.28 hrs
FF Starboard Tab Pos 0.00 %
FF TPS Percent 0.12 %
FF Trim Position 0.00 %

3 FUEL LVL2 CKT H
--------------------------------------------------------------------
FF Baro Pressure 14.59 PSI
FF Battery Volts 12.36 VDC
FF Sea Pump Pressure 0.33 PSI
FF Boat Speed 0.00
FF Manifold Air Temp 123.80 °F
FF Coolant Temp 140.00 °F
FF Demand 0.12 %
FF Engine Speed 0 RPM
FF Engine State Stall
FF FPC Total 0.0 Counts
FF Frequency Count 879
FF Fuel Level 0.00 %
FF Gear Position In Gear
FF Lake Temp 431.60 °F
FF Engine Load 0.00 %
FF Main Pwr Relay Requests 32772.0
FF Manifold Air Pressure 14.58 PSI
FF Oil Level 0.00 %
FF Port Tab Pos 0.18 %
FF Available Power 100 %
FF Run Time 111.28 hrs
FF Starboard Tab Pos 0.00 %
FF TPS Percent 0.12 %
FF Trim Position 0.00 %

4 PITOT CKT LO
--------------------------------------------------------------------
FF Baro Pressure 14.59 PSI
FF Battery Volts 12.30 VDC
FF Sea Pump Pressure 0.52 PSI
FF Boat Speed 0.00
FF Manifold Air Temp 123.80 °F
FF Coolant Temp 140.00 °F
FF Demand 0.12 %
FF Engine Speed 0 RPM
FF Engine State Stall
FF FPC Total 0.0 Counts
FF Frequency Count 802
FF Fuel Level 0.00 %
FF Gear Position In Gear
FF Lake Temp 431.60 °F
FF Engine Load 0.00 %
FF Main Pwr Relay Requests 32772.0
FF Manifold Air Pressure 14.58 PSI
FF Oil Level 0.00 %
FF Port Tab Pos 0.45 %
FF Available Power 100 %
FF Run Time 111.28 hrs
FF Starboard Tab Pos 0.00 %
FF TPS Percent 0.12 %
FF Trim Position 0.00 %

5 FUEL LVL CKT HI
--------------------------------------------------------------------
FF Baro Pressure 14.59 PSI
FF Battery Volts 12.30 VDC
FF Sea Pump Pressure 0.51 PSI
FF Boat Speed 0.00
FF Manifold Air Temp 123.80 °F
FF Coolant Temp 140.00 °F
FF Demand 0.12 %
FF Engine Speed 0 RPM
FF Engine State Stall
FF FPC Total 0.0 Counts
FF Frequency Count 810
FF Fuel Level 0.00 %
FF Gear Position In Gear
FF Lake Temp 431.60 °F
FF Engine Load 0.00 %
FF Main Pwr Relay Requests 32772.0
FF Manifold Air Pressure 14.58 PSI
FF Oil Level 0.00 %
FF Port Tab Pos 0.43 %
FF Available Power 100 %
FF Run Time 111.28 hrs
FF Starboard Tab Pos 0.00 %
FF TPS Percent 0.12 %
FF Trim Position 0.00 %

6 CRANK SNSR
--------------------------------------------------------------------
FF Baro Pressure 14.73 PSI
FF Battery Volts 11.28 VDC
FF Sea Pump Pressure 0.62 PSI
FF Boat Speed 0.00
FF Manifold Air Temp 120.20 °F
FF Coolant Temp 156.20 °F
FF Demand 0.00 %
FF Engine Speed 324 RPM
FF Engine State Running
FF FPC Total 25.0 Counts
FF Frequency Count 34
FF Fuel Level 0.00 %
FF Gear Position In Gear
FF Lake Temp 431.60 °F
FF Engine Load 21.33 %
FF Main Pwr Relay Requests 33812.0
FF Manifold Air Pressure 14.31 PSI
FF Oil Level 0.00 %
FF Port Tab Pos 0.24 %
FF Available Power 69 %
FF Run Time 109.77 hrs
FF Starboard Tab Pos 0.00 %
FF TPS Percent 0.00 %
FF Trim Position 0.00 %

7 CAM SNSR
--------------------------------------------------------------------
FF Baro Pressure 14.73 PSI
FF Battery Volts 11.44 VDC
FF Sea Pump Pressure 0.63 PSI
FF Boat Speed 0.00
FF Manifold Air Temp 120.20 °F
FF Coolant Temp 156.20 °F
FF Demand 0.00 %
FF Engine Speed 323 RPM
FF Engine State Running
FF FPC Total 25.0 Counts
FF Frequency Count 35
FF Fuel Level 0.00 %
FF Gear Position In Gear
FF Lake Temp 431.60 °F
FF Engine Load 21.33 %
FF Main Pwr Relay Requests 33812.0
FF Manifold Air Pressure 14.31 PSI
FF Oil Level 0.00 %
FF Port Tab Pos 0.25 %
FF Available Power 69 %
FF Run Time 109.77 hrs
FF Starboard Tab Pos 0.00 %
FF TPS Percent 0.00 %
FF Trim Position 0.00 %

8 GUARDIAN
--------------------------------------------------------------------
FF Baro Pressure 14.70 PSI
FF Battery Volts 14.08 VDC
FF Sea Pump Pressure 8.38 PSI
FF Boat Speed 12.00
FF Manifold Air Temp 125.60 °F
FF Coolant Temp 158.00 °F
FF Demand 97.59 %
FF Engine Speed 4821 RPM
FF Engine State Running
FF FPC Total 80.0 Counts
FF Frequency Count 0
FF Fuel Level 0.00 %
FF Gear Position In Gear
FF Lake Temp 431.60 °F
FF Engine Load 37.07 %
FF Main Pwr Relay Requests 33812.0
FF Manifold Air Pressure 14.04 PSI
FF Oil Level 0.00 %
FF Port Tab Pos 0.25 %
FF Available Power 5 %
FF Run Time 110.93 hrs
FF Starboard Tab Pos 0.00 %
FF TPS Percent 97.59 %
FF Trim Position 0.00 %

9 MAP INPUT HI
--------------------------------------------------------------------
FF Baro Pressure 14.73 PSI
FF Battery Volts 11.30 VDC
FF Sea Pump Pressure 0.64 PSI
FF Boat Speed 0.00
FF Manifold Air Temp 120.20 °F
FF Coolant Temp 154.40 °F
FF Demand 0.25 %
FF Engine Speed 297 RPM
FF Engine State Crank
FF FPC Total 0.0 Counts
FF Frequency Count 66
FF Fuel Level 0.00 %
FF Gear Position In Gear
FF Lake Temp 431.60 °F
FF Engine Load 0.00 %
FF Main Pwr Relay Requests 33812.0
FF Manifold Air Pressure 14.75 PSI
FF Oil Level 0.00 %
FF Port Tab Pos 0.22 %
FF Available Power 76 %
FF Run Time 109.77 hrs
FF Starboard Tab Pos 0.00 %
FF TPS Percent 0.25 %
FF Trim Position 0.00 %

Fault Log Data
Fault Descriptions Seconds

Battery Range High: 0
Battery Range Low: 0
Block Pressure is Low: 0
Compressor Temp Overheat: 0
ETC Motor Open: 0
ETC Motor Short: 0
Fuel Pressure Sensor Input High: 0
Fuel Pressure Sensor Input Low: 0
Guardian Strategy: 22
Knock Sensor 1: 0
Knock Sensor 2: 0
Low Oil Pressure Strategy: 0
Low Oil Remote Strategy: 0
Low Oil Reserve Strategy: 0
MAP Sensor 1 Input High: 44
MAP Sensor 1 Input Low: 0
MAP Sensor 1 Idle Rational: 0
Oil Pump Output: 0
Overspeed: 20
Port Clnt Overheat: 0
Starboard Clnt Overheat: 0
Warning Horn Output: 0
Water In Fuel: 0

Engine Run Time History:

Total engine run time: 111.28 Hours
0 - 749 RPM: 30.50 Hours
750 - 1499 RPM: 16.10 Hours
1500 - 2999 RPM: 8.32 Hours
3000 - 3499 RPM: 24.97 Hours
3500 - 3999 RPM: 24.62 Hours
4000 - 4499 RPM: 4.77 Hours
4500 - 4999 RPM: 1.97 Hours
5000 - 5499 RPM: 0.05 Hours
Over 5499 RPM: 0.00 Hours

Re: Diacom Guru needed Dave_n?????
 

Dave,
I don't think it was due to low Sea Pump Pressure, and it is hard to say exactly what happened, but it looks like the Overspeed fault is the one that caused you to go to Guardian mode. Both occured at 110.93 engine hours.

What exactly happened? Did the engine completely shut down, or did it just slow to a certain RPM?

The crank, cam and MAP faults all occured during start-up at 109.77 engine hours. It's not unusual for a 496 to have stored crank and cam faults but still run normally.

The stored MAP fault shows a frequency count of 66. This isn't normal and something is going on there, but it doesn't look like that factors in with your Gaurdian Mode incident at 110.93 engine hours. You may want to throw a new MAP sensor in there.

I would suggest clearing all faults and the freezframe memory and if it happens again, hook up the computer before shutting down.

Dave

Re: Diacom Guru needed Dave_n?????
 

Boost?

Manifold Air Pressure 14.58 PSI

Re: Diacom Guru needed Dave_n?????
 

Thanks Dave. The motor did not shut down completely. I was running at about 4500 RPMs and I had a sudden loss of power and the motor sounded REAL bad. I came off plane, it came back to an idle and seemed fine. My guages looked fine too. I didn't want to shut it off, so I let it idle for a few minutes and then headed back to the marina. I didn't take it above 4000 rpms on the way back, but everything seemed normal. I got home, flushed the motor and ran the diags.

Re: Diacom Guru needed Dave_n?????
 

Dave,
The active faults you show are normal. You may have one in fault history that shows up. The Cam, Crank, and Map faults appear to be during engine start. This is not uncommon. The one thing that stands out to me is the sea pump pressure in the Guardian FF is only 8.38 @ 4821 RPM with 5% Available Power. I do not recall the range, but I think it should be closer to 15.

Re: Diacom Guru needed Dave_n?????
 

Thanks IH. Looking at some of my other recordings, at 4800 RPMs, I'm showing 22.52 psi Sea Pump Pressure.

As soon as I came off plane everything seemed fine. This time of year there are a lot of clumps of sea weed and grass floating in the water. I'm thinking I caught omething on the outdrive that wouldn't come off. I havn't ran the boat since then. I hope to run it this weekend.

The math adds up too, it occurred approx. 25 minutes before I ran the diags. It took me about 15 minutes to get back to the marina, then I flushed it for 5 or 10 minutes.

Re: Diacom Guru needed Dave_n?????
 

Well, I ran the boat pretty hard yesterday and NO problems. I scanned the motor when I got home and no codes where present except for the usual ones.

I'm sticking with my assumption that I caught some trash on the water pickups. That would of lowered my sea pump pressure and could of caused the overspeed by cavitating the prop.

The new technology is great. If it was the older style motors I probably would of toasted my impellor and possibly the whole motor.

Re: Diacom Guru needed Dave_n?????
 

What about the MAP fault(s)? Did it come back?

Dave

Re: Diacom Guru needed Dave_n?????
 

Not this time. I put about 3 hours on it yesterday. The first thing I did before firing her up was give the map sensor connector a push to make sure it was snug.