RG14512
—UN—05APR06
Dual Throttle Wiring Harness A—Wheelhouse Throttle Input
B—Wheelhouse Station Select Input
C—External Shutdown Connection D—Starter Cutout Relay
E—23Pin Connector F— 21Pin Connector
G—Auxiliary Station Select Input H—Auxiliary Station Select
Adapter
I— Auxiliary Throttle Adapter J— Auxiliary Throttle Input K—Engine Synchronized Output L— Engine Synchronized Input
M—Battery, Ground, Switched Power, and Start (to Instrument Panel) N—CAN Connection (to
DB92450,0000033 1928SEP051/1
Engine Synchronization Throttle Control
RG14460
—UN—28SEP05
Engine Synchronization Throttle Control Schematic
Two marine engines, having separate ECUs, are
configured such that their speeds can be matched, one to the other. The ECU of either engine may be designated as lead ECU through the Trim Options page.
IMPORTANT: Both ECUs must not be programmed to be lead, nor both ECUs programmed to be follower.
Synchronized engine operation is enabled when the Synchronize Enable Switch of the Follower ECU (A) is closed. This provides the path for system voltage (switched) (A2) to command follower ECU to enable synchronized engine operation (C2).
Once the operation is enabled, ECUs provide potential (G2) and ground (A2) for Synchronize Enable lights, which come on, and remain on. Follower engine ECU tachometer output is disabled. It no longer responds to its throttle. It continuously receives leadengine (B) tachometer output (E3), which it uses to cause the follower engine to match the speed of the lead engine.
In order to achieve and maintain synchronous engine speed operation:
•
Both engine speeds must be within 100 rpm, or less, of each other.•
Individual throttle command values must be within 5% of each other.•
Both engine speed signal values must be 975 rpm, or more.When attempting Synchronous engine operation, if one or more of the above conditions are not met, Synchronize Enable lights continuously flash on and off, until the failing condition(s) has (have) been corrected.
Synchronize Enable lights test occurs at key ON – lights briefly come on. For this test to happen, ignition key must have been OFF for at least thirty seconds, prior to turning it back on
CTM331 (15FEB11)
0314011
4.5L and 6.8L Level 12 Electronic Fuel System022311
DB92450,0000034 1904OCT051/1
Throttle Control Location Transfer
RG14461
—UN—28SEP05
Throttle Control Location Transfer Schematic
This feature allows throttle control from one of two locations, the wheelhouse or a second (auxiliary) station. When the ECU is initialized at key ON, throttle control defaults to the station selected via the trim options page during the last ECU programming.
To change throttle control location during engine operation, the station select pushbutton switch at the requesting throttle is held engaged until that station’s lamp is continuously lit, indicating that throttle control transfer has been successful. At this point, the switch can be released without interrupting throttle control at that station. In the case depicted in the above figure, Throttle Transfer Switch at the auxiliary throttle control station has been pushed ON. This connects Auxiliary Throttle Input (B3) to Auxiliary Throttle Transfer Switch Input (H1), informing ECU (A) of the transfer initiation. ECU provides Auxiliary Throttle Lamp Drive potential (G2) through the lamp to power ground (J2), causing it to light. ECU simultaneously stops Wheelhouse Throttle Lamp Drive potential (J1), causing the wheelhouse throttle control lamp to go out. Throttle control is now at the auxiliary location, and no longer at the wheelhouse location, from Wheelhouse Throttle Input (E1) to Wheelhouse Throttle Transfer Switch Input (H2).
For transfer of throttle control to be successful, the position of the requested throttle must be within 2% of the active throttle position. If the requesting throttle is not within the required 2%, upon initiation attempt of control transfer, the lamp flashes on and off. If the station select pushbutton switch is held engaged and the operator moves the requesting throttle to within the required 2%, transfer will occur, The lamp will go from flashing to solid, and the switch at the requesting throttle can be released. If the requesting throttle position is outside normal operating range (that is, out of normal signal range: 00.5 volts low and 4.55.0 volts high), its lamp momentarily lights, then shuts off and remains off. If the switch contacts of both throttles are simultaneously closed, the ECU selects the “highest priority location”, which has been designated during ECU programming.
At key ON, a test of the lamps at both throttle stations will occur. Any lamp that does not come on during this test is bad, and should be replaced. For this test to happen, ignition key must have been OFF for at least thirty seconds.
RG40854,0000115 1924JAN021/1
RG41183,00000E0 1904OCT051/2
RG41183,00000E0 1904OCT052/2
Pump Solenoid
Located on the end of the injection pump, the pump solenoid (A) controls the movement of the pump control valve. This controls the quantity of fuel delivered to the engine. When the Engine Control Unit (ECU) supplies no current to the solenoid, the valve does not move. Thus, the injection pump delivers no fuel. When the ECU supplies current to the solenoid, the pump control valve closes off the high injection chamber, which allows the fuel in the chamber to reach injection pressure. The quantity of fuel is determined by various sensors in the control system and messages sent to the ECU.
A—Pump Solenoid Connector
A
RG1
1966
—UN—29JAN02