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| Illustration 1 | g06586474 |
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(1) GS520 Blade IMU
(2) G6:M6 GPS Receiver (3) Implement ECM (4) GS510 Chassis IMU (5) EC520 Chassis IMU/ECM | |
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| Illustration 2 | g06540920 |
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(1) Connector view from ECM side
(2) Connector view from harness side | |
The Implement ECM bases decisions based on input information and memory information. After the Implement ECM receives the input information, the ECM sends a corresponding response to the outputs. The inputs and outputs of the Implement ECM are connected to the machine harness by two 70 contact connectors (J1 and J2). The inputs and outputs to the ECM can be viewed through the AVSpare Electronic Technician (Cat ET).
Note: Only the complete ECM is serviced (no lower levels components). The ECM must be replaced if the ECM is damaged. Replace the ECM if a failure is diagnosed.
To aid in diagnostics of certain types of electrical circuits that are controlled by the ECM, an internal "pull up voltage" is connected to ECM switch and sensor signal input contacts. An above normal voltage is internally connected to the ECM signal input circuit through a resister.
During normal operation, the switch or sensor signal will hold the circuit low or at a certain signal amplitude, however, circuit conditions such as a loss of power to the component, a disconnection, or an open circuit will allow the circuit to be pulled high by the ECM pull-up voltage. This condition will result in an above normal voltage condition at the ECM contact. As a result, the ECM will activate an FMI 03 (voltage above normal) diagnostic code for the affected circuit.
The types of ECM input circuits that have pull up voltage present are:
- Pulse Width Modulated (PWM) sensor input circuits
- Switch to Ground Input switch input circuits
- Active analog (voltage) input signal circuits
- Passive analog (resistance) input signal circuits
To aid in diagnostics of electrical circuits that are controlled by the ECM, an internal "pull down voltage" is connected to ECM switch to battery type input circuits.
During normal operation, the switch contacts that are allowing the connection to a voltage source will hold the circuit high. When circuit conditions such as a loss of power to the switch supply voltage, a disconnection in the switch circuit or an open circuit will allow the circuit to be pulled low by the ECM pull-down voltage. This condition will result in a below normal voltage condition at the ECM contact. As a result, the ECM will activate an FMI 04 (voltage below normal) diagnostic code for the affected circuit.
The Cat Data Link is used to provide a connection for the service tool for troubleshooting, testing, and calibrations. The data link is bidirectional. The data link allows the ECM to receive information. The data link also allows the ECM to send information.
| Implement ECM Connector J2
Contact Descriptions(1) |
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|---|---|---|
| No. | Type | Function |
| 64 | CAN Data Link (+) | CAN B+ |
| 65 | CAN Data Link (-) | CAN B- |
| 67 | CAN Data Link (+) | CAN A+ |
| 68 | CAN Data Link (-) | CAN A- |
| (1) | Contacts that are not listed are not used. |
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| Illustration 3 | g06565457 |
The EC520 uses multiple CAN and 4 wire Ethernet connections.
The EC520 uses Ethernet to communicate through the AVSpare Network Manager to allow servicing via the 14-pin service port connector.
The EC520 has an Ethernet connection to the Dash to communicate with the GRADE display if equipped or retrofit.
The EC520 has multiple CAN networks.
- One communicates to GPS receivers.
- One communicates to other IMUs positioned across the machine.
- One communicates to the AVSpare Implement ECM.
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| Illustration 4 | g06565764 |
This unit mounts to the rear right HVAC cover.
This unit has both antenna and receiver built into one housing.
This unit is CAN based requiring a proper CAN bus and power (Keyed and Constant)
The unit is not flashable, but can be viewed in WinFlash. A custom-built harness is needed to tap into CAN buss and power.
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| Illustration 5 | g06565776 |
The GS520 is mounted to the back of the machine blade.
- Not every custom or work tool blade has mounting holes for this sensor.
- Most factory blades have sensor mounting. (VPAT, U, SU, S)
Reference: Refer to installation instructions in a special instruction for the correct model.
CAN based sensor with a 5-pin round M12 style connector communicates with EC520.
Flashable as a sub module of the EC520, only needed when updating EC520.
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| Illustration 6 | g06565792 |
CAN based sensor with 4-pin DT connector communicating with EC520.
Flashable as a sub module of the EC520, only needed when updating EC520.