8794A 9 Mariner TRANSOM BRACKET (PORT) (BLACK)

Electronic Controls
The electronic control system consists of three main components: the ECM, the Personality Module, and the MUI Interface Module. The ECM is the computer hardware which controls the engine and the Personality module is the software which controls how the computer behaves. The MUI Interface Module provides signal conditioning that allows the ECM to position the rack actuator.Rack Controls
The ECM determines the desired engine rpm based on throttle inputs and load. The ECM attempts to maintain the desired engine rpm by sensing actual engine rpm with the Engine Speed Sensor and controlling the rack.To move the rack, the ECM adjusts the signal voltage to the MUI Interface Module, which adjusts current to the Rack Actuator to increase or decrease rack. The ECM increases or decreases the signal voltage to the MUI Interface Module until the Rack Position Sensor indicates that the desired rack position has been reached.The ECM sets certain limits on the amount of fuel that can be injected. FRC Rack is a rack limit used to reduce smoke during acceleration and operates in a manner similar to the FARC on a mechanically governed engine. When the ECM senses a higher inlet manifold (Boost) pressure (more available air for combustion), the FRC Rack limit is increased to allow more fuel. Rated Rack is a limit based on the power rating of the engine. It is similar to the rack stops and the torque spring on a mechanically governed engine. Rated Rack determines maximum power and torque values for a specific engine family and rating. FRC Rack and Rated Rack are programmed by the factory into the Personality Module.
Figure 1.1 - Electronic Governor Block DiagramProgrammable Parameters
Certain parameters that effect engine operation may be changed with an electronic service tool. These parameters are stored in the ECM and are either System Configuration Parameters or Customer Parameters. System Configuration Parameters are parameters that affect power ratings or emissions. Customer Parameters affect settings such as low and high idle rpm.Passwords
System Configuration Parameters are protected from unauthorized changes by Factory Passwords. Customer Parameters are protected by Customer Passwords that are programmed by the customer.Self-Diagnostics
The ECM has some ability to diagnose itself. When a problem is detected, a diagnostic code is generated and the diagnostic code is indicated on the Diagnostic Lamp as a series of flashes. In most cases, the diagnostic code is also stored in permanent ECM memory.A diagnostic codes that represent a currently existing problem is called ACTIVE. ACTIVE codes should always be serviced first.Diagnostic codes that are stored in memory are called LOGGED. Since the problem may have been temporary, or may have been repaired since the time it was logged, Logged diagnostic codes do not necessarily mean something needs to be repaired. Instead, they are meant to be an indicator of probable causes for intermittent problems. In addition, some logged diagnostic codes record EVENTS rather than failures.Diagnostic codes not requiring factory passwords to clear are automatically erased after 100 ECM operating hours. Refer to Section 4: Troubleshooting Without A Diagnostic Code for details.System Alarm Outputs
The ECM provides outputs to drive three different warning lamps to alert the operator of certain operating conditions. These lamp outputs are:* Low Oil Pressure* High Coolant Temperature* DiagnosticThe Diagnostic Lamp displays diagnostic conditions detected by the ECM using flash codes. Refer to P-505: Alarm Lamps for additional information.
Figure 1.2 - System Alarm OutputsSystem Component Diagram
Figure 1.3 - System Component DiagramEngine Sensor And Connector Locations
Figure 1.4 - Engine Sensor And Connector LocationsEngine Sensor And Connector Locations
Figure 1.5 - Engine Sensor And Connector LocationsConnector Pin Descriptions
Electrical Connectors And Functions
Electronic Service Tools
Caterpillar Electronic Service Tools are designed to help the service technician obtain and analyze data and diagnose existing and potential problems within the system. Their use is required to perform calibrations and to read or change programmable parameters.The electronic service tools for use with the engine are the Electronic Technician (ET) and