BEARING 9R1107 - Caterpillar

The Electronic Control Module (ECM) has two throttle inputs and two engine synchronization inputs. The engine synchronization inputs are controlled in order to allow the ECM to respond to either of the throttle inputs. This capability allows all of the engines that are synchronized to respond to a single throttle. This capability minimizes variations in speed and in load between engines during engine operation.Use this procedure in order to troubleshoot any suspect problems with engine synchronization. The following items can cause problems with engine synchronization:
Configuration parameters
Harness wiring or components
ECMThe following configuration parameters affect engine synchronization:
"Number of Synchronized Engines Configuration"
"Engine Location"
"Secondary Throttle Enable Status"These parameters must be programmed correctly in order for the engines to become synchronized. Refer to Troubleshooting, "Configuration Parameters" for information that is related to programming these parameters in the correct manner.The engine synchronization inputs operate according to the following conditions:When neither of the engine synchronization inputs are connected to the −Battery, the ECM will respond to the signal that is present at the primary throttle input.When the engine synchronization input (No. 1) is connected to the −Battery, the ECM will respond to the signal that is present at the primary throttle input.When the engine synchronization input (No. 2) is connected to the −Battery, the ECM will respond to the signal that is present at the secondary throttle input.If the engine synchronization input (No. 1) and the engine synchronization input (No. 2) are connected to the −Battery at the same time, the ECM will respond to the signal that is present at the primary throttle input. The application wiring should be designed to prevent this condition from occurring.Note: The ECM will not transfer control between the throttle inputs unless the throttle inputs are within 50 rpm of each other.There are four possible configurations for engine synchronization. The following information describes each configuration.Single Engine Configuration
Illustration 1 g01376237
Schematic for a single engine configuration
In this configuration, a single engine can be controlled by two throttles. The secondary throttle is enabled by activation of a switch. This switch is wired to the engine synchronization input (No. 2).Dual Engine Configuration
Illustration 2 g01376470
Schematic for a dual engine configuration
In this configuration, the position of the synchronization switch determines the throttle input that is recognized by each engine. Table 1 lists the engine response to each position of the switch.
Table 1
Engine Response to the Synchronization Switch
Position of the Synchronization Switch Engine Response
Starboard Both engines respond to the starboard throttle.
None Each engine responds to a separate throttle.
Port Both engines respond to the port throttle. Multiple Engine Configuration Without a Dedicated Master Throttle
Illustration 3 g01376549
Multiple engine configuration with one throttle that is designated as a master throttle
In these configurations, one of the throttles has been designated as the master throttle. When the engine synchronization switch is not activated, each engine will respond to the appropriate throttle. When the engine synchronization switch is activated, all of the engines will respond to the master throttle. Three engines and three throttles are shown. As many as five engines and five throttles can