- Engine:
- 3508B (S/N: S2D1-UP; S2E1-UP; S2F1-UP)
- 3512B (S/N: S2J1-UP; S2K1-UP; S2L1-UP; S2M1-UP; S2N1-UP)
- 3516B (S/N: S2S1-UP; S2X1-UP; S2Y1-UP)
Problem
The engine can spontaneously shutdown when running normally on the primary electronic control module (ECM), if the backup ECM loses battery power. This problem is caused by the momentary start/stop relay logic for the above engines. However, this problem does not occur on every engine.
- The problem does not occur on engines that have a modified relay logic that allows the engine to function in a legacy mode. An example of this is a non-momentary start/stop switch. These engines generally use the remote pilothouse panels.
- The problem does not occur while the local Engine Control Switch (ECS) is in the "START" position.
Note: Some vessels are not equipped with a remote start/stop panel. In this case, the only way to start the engine and stop the engines is with the engine mounted control panel.
This problem only occurs under the following conditions:
- The engine is a marine propulsion engine.
- The Marine Power Display (MPD) panel relay logic is wired for a remote momentary start/stop switch.
- The vessel is wired for remote start/stop control.
Solution
Remove the shutdown notify relay that is located within the MPD panel. Refer to Illustration 1.
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| Illustration 1 | g01172440 |
(1) Label (2) Shutdown notify relay that is labeled "SN" | |
The shutdown notify relay (2) is a plug-in type relay. The relay is labeled "SN". There is no need to disturb the wiring to the terminal block.
Add label (1) that says, "Shutdown Notify Relay is Not Required for this Application".
Note: The shutdown notify relay eliminates the need to momentarily depress the "STOP" button first in order to start the engine. Using the relay, the engine would start the first time that the "START" button was depressed.
With this modification a slight difference in the operator procedure is required for starting the engine remotely following an ECM initiated shutdown due to low oil pressure or to high coolant temperature.
This procedure is now required for the following cases:
- Engines that have been modified to function with legacy remote start/stop wiring.
- Engines that are running with the ECS in the local "RUN" position.
To restart the engine when the engine was running with the local ECS or with the legacy remote ECS in the "RUN" position:
- Cycle the power to the ECM. Turn the ECS to the "STOP" position. You will be able to start the engine when you turn the ECS to the "RUN" position.
To restart the engine when the engine was running with the ECS in the "REMOTE" position and the shutdown notify relay has been removed:
- Press the remote pilothouse "STOP" button. You will be able to start the engine once the remote "START" button is pressed.