 | |
| Illustration 1 | g00785019 |
Electronic Control Module (ECM) | |
The Machine ECM makes decisions that are based on input information and memory information. After the Machine ECM receives the input information, the ECM sends a corresponding response to the outputs. The inputs and outputs of the Machine ECM are connected to the machine harness by two 70 contact connectors (J1 and J2). The ECM sends the information to the Caterpillar Electronic Technician (Cat ET) on the Cat Data Link.
Note: The ECM is not serviceable. The ECM must be replaced if the ECM is damaged. Replace the ECM if a failure is diagnosed.
Inputs
The inputs describe the status of the machine systems. Two types of inputs exist. The inputs can be either a switch type or a sensor type. Switches provide an open, a ground, or a + battery signal to the inputs of the controller. Sensors (frequency, PWM or voltage) provide a changing signal to the sensor inputs of the controller. The inputs to the hydrostatic transmission ECM are listed in table 1 and table 2.
Outputs
The Machine ECM responds to decisions by sending electrical signals to the outputs. The outputs can create an action or the outputs can provide information to the operator or the service technician. The outputs of the ECM are listed in table 1 and table 2.
Pin Locations
The Cat Data Link is used in order 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 allows the ECM to send information.
| Machine ECM Contact Description J1 (1) | |
|---|---|
| No. (2) | Function |
| 1 | Key Switch Input |
| 10 | CAT Data Link + |
| 11 | 5 Volt Sensor Supply |
| 12 | Backup Alarm |
| 13 | Ground |
| 14 | AC Thermostat |
| 17 | Engine Speed + |
| 18 | Engine Speed - |
| 20 | CAT Data Link - |
| 21 | 5 Volt Sensor Return |
| 22 | Hydraulic Oil Temp Sender |
| 23 | Ground |
| 24 | AC Manual Mode |
| 25 | AC Auto Mode |
| 26 | Winch Drive Away N/C |
| 27 | Winch Drive Away N/O |
| 29 | AC Recirc Temp |
| 30 | Fuel Level Sender |
| 31 | + Battery |
| 33 | Park Brake N/C |
| 34 | Park Brake N/O |
| 35 | Reversing Fan Switch N/C |
| 36 | AC Temp Control Signal |
| 37 | Hydraulic Oil Pressure Sensor |
| 38 | + Battery |
| 39 | + Battery |
| 40 | Reversing Fan Switch N/O |
| 41 | My Speed N/C |
| 42 | My Speed N/O |
| 43 | Cab Removed N/O |
| 44 | 8 Volt Sensor Supply |
| 45 | 8 Volt Sensor Return |
| 47 | + Battery |
| 48 | Left Pump Forward Sol |
| 49 | Left Pump Reverse Sol |
| 50 | Proportional Return |
| 51 | Right Pump Forward Sol |
| 52 | Right Pump Reverse Sol |
| 53 | AC Louver Temp |
| 55 | Proportional Return |
| 56 | 10 Volt Sensor Return |
| 57 | Ground |
| 58 | Left Motor Solenoid |
| 59 | Right Motor Solenoid |
| 60 | Proportional Return |
| 61 | Blade Tilt Right Solenoid |
| 62 | Blade Tilt Left Solenoid |
| 63 | Auto/Man & Blade Shake N/O |
| 64 | Cab Removed N/C |
| 65 | Demand Fan Solenoid |
| 67 | Blade Raise Solenoid |
| 68 | Blade Lower Solenoid |
| 69 | 10 Volt Sensor Supply |
| ( 1 ) | The ECM responds to an active input only when all of the necessary conditions are satisfied. |
| ( 2 ) | The connector contacts that are not listed are not used. |
| Machine ECM Contact Description J2 (1) | |
|---|---|
| No. (2) | Function |
| 1 | Key Start Switch |
| 2 | Implement Shutoff Solenoid |
| 3 | Hystat Override Solenoid |
| 4 | On/Off Return |
| 5 | Winch Brake Solenoid |
| 6 | Parking Brake Solenoid |
| 7 | Starter Relay |
| 8 | Starter Relay Return |
| 9 | Winch Drive Away Lamp |
| 10 | Winch Free Spool Cab Lamp |
| 12 | AC Clutch Solenoid |
| 13 | PHS |
| 14 | R Terminal |
| 19 | AC Condensers Relays |
| 21 | Water Valve Actuator Signal |
| 23 | Service Brake Pedal Switch (Normally Closed) |
| 24 | Decel Pedal Sensor |
| 25 | Joystick Steering Sensor |
| 26 | Joystick Sensor "FNR" |
| 27 | Implement Cal Sensor |
| 28 | Service Brake Pedal Switch (Normally Open) |
| 29 | 4th Valve Function Extend |
| 30 | 4th Valve Function Retract |
| 31 | Monitoring System Dimming |
| 32 | Blade Angle Sensor |
| 33 | Blade Raise Sensor |
| 34 | Blade Tilt Sensor |
| 36 | Winch Free Spool N/C |
| 37 | Winch Free Spool N/O |
| 39 | 4th Valve Function Parity |
| 40 | Right Speed Sensor A |
| 41 | Right Speed Sensor B |
| 42 | Left Speed Sensor A |
| 43 | Left Speed Sensor B |
| 44 | Operator Not Present N/O |
| 45 | Operator Not Present N/C |
| 46 | Implement Shutoff Switch N/O |
| 47 | Implement Shutoff Switch N/C |
| 49 | Ripper Joystick Sensor |
| 50 | Winch Pressure Sensor |
| 51 | Accel/Decel Roller |
| 52 | Increment Switch N/O |
| 53 | Decrement Switch N/O |
| 54 | Auto/Man & Blade Shake N/C |
| 55 | Throttle Switch Position |
| 56 | Can A+ |
| 58 | Throttle Switch Position |
| 59 | Throttle Switch Position |
| 60 | Throttle Switch Position |
| 64 | CAN B+ |
| 65 | CAN B- |
| 67 | CAN A+) |
| 68 | CAN A- |
| 70 | CAN A- |
| ( 1 ) | The ECM responds to an active input only when all of the necessary conditions are satisfied. |
| ( 2 ) | The connector contacts that are not listed are not used. |