|
496/Diacom experts...question
I have a Whippled 496HO that is having a sensor and/or electrical issue. The engine just shuts off like someone is turning the key off.
Sequence of events.... First time out boat is running fine; has a small hickup at 3500rpm but all gauges seem fine. Run it up to 4500 and it just shuts off. Fires right back up sounds perfect goes into gear, touch throttle and it dies. Fires right back up idles perfect and dies all by itself. Does this several times and batteries are drained. Towed in :( On hose and charged batteries I hook up Diacom and recorded the following as it dies all by itself over and over. (side note: ECM keeps loosing connectivity but still runs?? May be my laptop connection) Any way here are the two logs.....Cam sensor seems to be the culprit but I don't understand the Overspeed error? Any thoughts????? Logs in next two post... |
Re: 496/Diacom experts...question
DIACOM ® Diagnostic Status Report
05/13/2006 12:07:19 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 Engine Speed 0 RPM Available Power 100 % Coolant Temperature 80.60 °F Fuel Flow Rate 0.00 GPH Port Exhst Cool Temp 89.60 °F Sea Pump Pressure 0.00 PSI Starb Exhst Cool Temp 96.80 °F IAC Duty Cycle 0.00 % Manifold Absolute Pressure 12.31 PSI Trim Position 0 # Baro Pressure 12.33 PSI Trim Volts 0.00 VDC Manifold Air Temperature 89.60 °F Pitot ADC 0 # Oil Pressure 0.04 PSI Paddle Wheel 0 Hz Throttle Position 0.26 % Sensor Power 5.02 VDC Throttle Sensor Voltage 0.55 VDC Lake/Sea Temp 429.80 °F Spark Advance 6.00 DEG Fuel Level 0 # Battery Voltage 12.87 VDC 3. TROUBLE CODE STATUS Current ECM Codes Sensor Fault, click Read Fault button for details Trouble Code List: Trim Ckt Lo Code is active Freeze Frame Data: 0 Trim Ckt Lo -------------------------------------------------------------------- FF Baro Pressure 12.33 PSI FF Battery Volts 9.93 VDC FF Sea Pump Pressure 0.00 PSI FF Boat Speed 0.00 # FF Manifold Air Temp 118.40 °F FF Coolant Temp 80.60 °F FF Demand 0.13 % FF Engine Speed 154 RPM FF Engine State Crank FF FPC Total 0.0 Counts FF Frequency Count 14 FF Fuel Level 0.00 % FF Gear Position Neutral FF Lake Temp 431.60 °F FF Engine Load 0.00 % FF Main Pwr Relay Requests 33812.0 FF Manifold Air Pressure 12.24 PSI FF Oil Level 0.00 % FF Port Tab Pos 0.00 % FF Available Power 57 % FF Run Time 124.43 hrs FF Starboard Tab Pos 0.00 % FF TPS Percent 0.13 % FF Trim Position 0.00 % 1 Cam Snsr -------------------------------------------------------------------- FF Baro Pressure 12.33 PSI FF Battery Volts 13.00 VDC FF Sea Pump Pressure 0.00 PSI FF Boat Speed 0.00 # FF Manifold Air Temp 105.80 °F FF Coolant Temp 77.00 °F FF Demand 0.00 % FF Engine Speed 841 RPM FF Engine State Running FF FPC Total 27.2 Counts FF Frequency Count 6 FF Fuel Level 0.00 % FF Gear Position Neutral FF Lake Temp 429.80 °F FF Engine Load 5.01 % FF Main Pwr Relay Requests 33812.0 FF Manifold Air Pressure 8.97 PSI FF Oil Level 0.00 % FF Port Tab Pos 0.00 % FF Available Power 55 % FF Run Time 124.43 hrs FF Starboard Tab Pos 0.00 % FF TPS Percent 0.00 % FF Trim Position 0.00 % 2 Guardain -------------------------------------------------------------------- FF Baro Pressure 12.33 PSI FF Battery Volts 12.92 VDC FF Sea Pump Pressure 0.00 PSI FF Boat Speed 0.00 # FF Manifold Air Temp 105.80 °F FF Coolant Temp 77.00 °F FF Demand 0.00 % FF Engine Speed 623 RPM FF Engine State Running FF FPC Total 34.2 Counts FF Frequency Count 3 FF Fuel Level 0.00 % FF Gear Position Neutral FF Lake Temp 429.80 °F FF Engine Load 6.97 % FF Main Pwr Relay Requests 33812.0 FF Manifold Air Pressure 10.67 PSI FF Oil Level 0.00 % FF Port Tab Pos 0.00 % FF Available Power 0 % FF Run Time 124.43 hrs FF Starboard Tab Pos 0.00 % FF TPS Percent 0.00 % FF Trim Position 0.00 % 3 Overspeed -------------------------------------------------------------------- FF Baro Pressure 12.33 PSI FF Battery Volts 13.41 VDC FF Sea Pump Pressure 0.00 PSI FF Boat Speed 0.00 # FF Manifold Air Temp 86.00 °F FF Coolant Temp 77.00 °F FF Demand 0.00 % FF Engine Speed 1436 RPM FF Engine State Running FF FPC Total 22.2 Counts FF Frequency Count 5 FF Fuel Level 0.00 % FF Gear Position Neutral FF Lake Temp 429.80 °F FF Engine Load 3.72 % FF Main Pwr Relay Requests 33812.0 FF Manifold Air Pressure 6.71 PSI FF Oil Level 0.00 % FF Port Tab Pos 0.00 % FF Available Power 0 % FF Run Time 124.43 hrs FF Starboard Tab Pos 0.00 % FF TPS Percent 0.00 % 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: 20 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: 0 MAP Sensor 1 Input Low: 0 MAP Sensor 1 Idle Rational: 0 Oil Pump Output: 0 Overspeed: 0 Port Clnt Overheat: 0 Starboard Clnt Overheat: 0 Warning Horn Output: 0 Water In Fuel: 0 |
Re: 496/Diacom experts...question
2nd..
DIACOM ® Diagnostic Status Report 05/13/2006 12:13:57 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 Engine Speed 0 RPM Available Power 100 % Coolant Temperature 95.00 °F Fuel Flow Rate 0.00 GPH Port Exhst Cool Temp 100.40 °F Sea Pump Pressure 0.00 PSI Starb Exhst Cool Temp 98.60 °F IAC Duty Cycle 0.00 % Manifold Absolute Pressure 12.31 PSI Trim Position 0 # Baro Pressure 12.33 PSI Trim Volts 0.00 VDC Manifold Air Temperature 82.40 °F Pitot ADC 0 # Oil Pressure 0.04 PSI Paddle Wheel 0 Hz Throttle Position 0.13 % Sensor Power 5.02 VDC Throttle Sensor Voltage 0.55 VDC Lake/Sea Temp 431.60 °F Spark Advance 6.00 DEG Fuel Level 0 # Battery Voltage 13.33 VDC 3. TROUBLE CODE STATUS Current ECM Codes Sensor Fault, click Read Fault button for details Trouble Code List: Trim Ckt Lo Code is active Freeze Frame Data: 0 Trim Ckt Lo -------------------------------------------------------------------- FF Baro Pressure 12.33 PSI FF Battery Volts 9.93 VDC FF Sea Pump Pressure 0.00 PSI FF Boat Speed 0.00 # FF Manifold Air Temp 118.40 °F FF Coolant Temp 80.60 °F FF Demand 0.13 % FF Engine Speed 154 RPM FF Engine State Crank FF FPC Total 0.0 Counts FF Frequency Count 14 FF Fuel Level 0.00 % FF Gear Position Neutral FF Lake Temp 431.60 °F FF Engine Load 0.00 % FF Main Pwr Relay Requests 33812.0 FF Manifold Air Pressure 12.24 PSI FF Oil Level 0.00 % FF Port Tab Pos 0.00 % FF Available Power 57 % FF Run Time 124.43 hrs FF Starboard Tab Pos 0.00 % FF TPS Percent 0.13 % FF Trim Position 0.00 % 1 Cam Snsr -------------------------------------------------------------------- FF Baro Pressure 12.33 PSI FF Battery Volts 13.00 VDC FF Sea Pump Pressure 0.00 PSI FF Boat Speed 0.00 # FF Manifold Air Temp 105.80 °F FF Coolant Temp 77.00 °F FF Demand 0.00 % FF Engine Speed 841 RPM FF Engine State Running FF FPC Total 27.2 Counts FF Frequency Count 6 FF Fuel Level 0.00 % FF Gear Position Neutral FF Lake Temp 429.80 °F FF Engine Load 5.01 % FF Main Pwr Relay Requests 33812.0 FF Manifold Air Pressure 8.97 PSI FF Oil Level 0.00 % FF Port Tab Pos 0.00 % FF Available Power 55 % FF Run Time 124.43 hrs FF Starboard Tab Pos 0.00 % FF TPS Percent 0.00 % FF Trim Position 0.00 % 2 Guardain -------------------------------------------------------------------- FF Baro Pressure 12.33 PSI FF Battery Volts 12.92 VDC FF Sea Pump Pressure 0.00 PSI FF Boat Speed 0.00 # FF Manifold Air Temp 105.80 °F FF Coolant Temp 77.00 °F FF Demand 0.00 % FF Engine Speed 623 RPM FF Engine State Running FF FPC Total 34.2 Counts FF Frequency Count 3 FF Fuel Level 0.00 % FF Gear Position Neutral FF Lake Temp 429.80 °F FF Engine Load 6.97 % FF Main Pwr Relay Requests 33812.0 FF Manifold Air Pressure 10.67 PSI FF Oil Level 0.00 % FF Port Tab Pos 0.00 % FF Available Power 0 % FF Run Time 124.43 hrs FF Starboard Tab Pos 0.00 % FF TPS Percent 0.00 % FF Trim Position 0.00 % 3 Overspeed -------------------------------------------------------------------- FF Baro Pressure 12.33 PSI FF Battery Volts 13.41 VDC FF Sea Pump Pressure 0.00 PSI FF Boat Speed 0.00 # FF Manifold Air Temp 86.00 °F FF Coolant Temp 77.00 °F FF Demand 0.00 % FF Engine Speed 1436 RPM FF Engine State Running FF FPC Total 22.2 Counts FF Frequency Count 5 FF Fuel Level 0.00 % FF Gear Position Neutral FF Lake Temp 429.80 °F FF Engine Load 3.72 % FF Main Pwr Relay Requests 33812.0 FF Manifold Air Pressure 6.71 PSI FF Oil Level 0.00 % FF Port Tab Pos 0.00 % FF Available Power 0 % FF Run Time 124.43 hrs FF Starboard Tab Pos 0.00 % FF TPS Percent 0.00 % 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: 20 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: 0 MAP Sensor 1 Input Low: 0 MAP Sensor 1 Idle Rational: 0 Oil Pump Output: 0 Overspeed: 0 Port Clnt Overheat: 0 Starboard Clnt Overheat: 0 Warning Horn Output: 0 Water In Fuel: 0 |
Re: 496/Diacom experts...question
The first thing that I see is that the Sea Pump Pressure is 0.00. This may be the problem. There should be a SEA Pump PSI Lo or Block Press Lo Fault, but appearently there is not :confused: .
I think the Overspeed fault is just a byproduct of the reduced rev limit caused by running in Gaurdian Mode with 0% power available. As far as the Cam Sensor Fault, I see a lot of Cam Sensor and Crank Sensor faults on engines that run normally. I wouldn't mess with it just yet. I would begin with figuring out why you have no Sea Pump Pressure, repair, and retest. Dave |
Re: 496/Diacom experts...question
Dave,
I don't know if it matters but these logs were run on the hose and and probably never really had time to build pressure before stalling out. There was plent of water coming out the exhaust however. Wouldn't you think that if the WP was an issue it would throw a fault before shutting it down? Also, if the cam sensor was faulty could it be sending a faulty reading to the ECM making it think it was hitting the rev limiter? Thanks, Dave |
Re: 496/Diacom experts...question
Testing in the water would be better than on the hose, but I think if you had plenty of water coming out the exhaust, then there had to be some Sea Pump Pressure and the ECM should have detected it. And yes, I would think that you would get a code. You are showing NO Sea Pump pressure and even with no code, I think thats worth looking into.
I don't think the Cam Sensor fault is causing or related to the Overspeed fault in any way. Dave |
Re: 496/Diacom experts...question
I had one do the same thing and it was the sea pump, the one I tested had about 3 psi on the hose. also it set other codes but when the PSI switch was replaced all falt codes went away? Hope this helps. (by the way it was a new pump friom Mercury that was bad)
|
Re: 496/Diacom experts...question
Thanks for the input guys....
I'll keep tredging along :( |
Re: 496/Diacom experts...question
as stated above first I see is sea water pump press which will throw it in into guardian but shoudnt stall the mtr would cut back power, second is fuel flow if hooked up o.oo
I dont see the oil press in the ff file other then level 0.00 |
Re: 496/Diacom experts...question
Dave
I see you are having as much trouble as I was. Found my problem but seems too simple. Did not even think to look there, |
| All times are GMT -5. The time now is 05:55 AM. |
Copyright © 2026 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.