Electrical/Control Systems

Some CAN messages are based on feedback from sensors or controls. Electrical input from a control or sensor is converted to CAN messages which are broadcast on the CAN network and are acted upon by devices on the network. For example, input from the engine coolant temperature sensor is monitored by the ECU. If the sensor input rises above a set level (engine overheat), a CAN message (110-x) is broadcast on the system by the ECU, which is acted upon by devices on the network (error codes/output indicators on the display, possible engine de-rating, etc.).

The CAN system also allows for connecting an external computer for service and diagnostic purposes.

Control Module Locations

Electrical control modules (Fig. 538) are located on the chassis fire wall under the ROPS/FOPS behind the cab.

The following sections provide more information about the specific control modules:

• N - “Multi-function Control/Interlock Module (Controller 3)” on page301.

• Q - “Engine Control Module (ECU)” on page302.

• T - “Main ECU Power Relay 2” on page302.

• P - “Lift Arm and Standard Auxiliary Flow Control Module (Maestro Controller 1)” on page303.

• R - “Control Module (Maestro Controller 2)” on page303.

• S - “Optional High-Flow Module (Early Machines)” on page303.